WO2017182000A1

WO2017182000A1 - Method and device for migration of application instance and computer storage medium

Info

Publication number: WO2017182000A1
Application number: PCT/CN2017/081521
Authority: WO
Inventors: 宗在峰
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-04-21
Filing date: 2017-04-21
Publication date: 2017-10-26
Also published as: CN107305502A; CN107305502B

Abstract

Provided are a method and a device for migration of application instance, and a computer storage medium, comprising: capturing, by a source mobile edge host, a snapshot of a source application instance; and performing the snapshot synchronization between the source mobile edge host and a destination mobile edge host, so that the destination mobile edge host restores the running of the snapshot synchronized to the destination mobile edge host, wherein the snapshot being a running space of the source application instance at a capturing time, the running space comprising a running process and status information. The destination mobile edge host receives the snapshot of the source application instance sent by the source mobile edge host, the snapshot is restored into a destination application instance on the destination mobile edge host, and the destination application instance is run on the destination mobile edge host. When the destination application instance is run, the running is performed in accordance with the running process and the status information of the snapshot.

Description

Method and device for application instance migration, computer storage medium

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Apr. 21, 2016, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to an instance migration technology in the field of communications, and in particular, to a method and device for application instance migration, and a computer storage medium.

Background technique

Mobile Edge Computing (MEC, Mobile Edge Computing) reduces access by deploying applications such as edge streaming of video streams, local content delivery network (CDN, etc.) to locations close to access points such as base stations. Delay, save bandwidth, and increase throughput. The MEC Working Group of the European Telecommunications Standards Institute (ETSI) defines the architecture of mobile edge computing, as shown in Figure 1.

In this architecture, the Mobile Edge Host includes a Virtualization Infrastructure with a Data plane. A mobile edge platform and a number of mobile edge applications (ME app, Mobile Edge application) are also hosted on the mobile edge host. The mobile edge platform provides several mobile edge services (ME services, Mobile Edge services) for mobile edge applications. Mobile Edge Platform In order to support communication between mobile edge applications and mobile edge services, the mobile edge platform includes a service registry, which provides a publish registration mechanism for mobile edge service publishing services and mobile edge application subscription mobiles. Edge business. Mobile edge platform is also suitable Provide the Domain Name System (DNS) function so that the application can register its own IP address and Fully Qualified Domain Name (FQDN) to the DNS server. The traffic rules control in the mobile edge platform can control the forwarding rules of the data plane function, so that the traffic flowing through the mobile edge host can be redirected, for example, the traffic of a certain service flow is redirected. Go to the mobile edge app on the mobile edge host.

The Mobile Edge orchestrator is responsible for lifecycle management of mobile edge applications, configuration of mobile edge platforms, and selection of mobile edge platforms. The Office of Strategic Services (OSS) provides an interface to third parties that allows third parties to load mobile edge applications into the mobile edge system and trigger instantiation and instance termination of mobile edge applications. The Mobile Edge platform manager is responsible for configuring the lifecycle management of the mobile edge platform and the mobile edge application, for example, configuring the mobile edge application corresponding traffic rules and DNS rules to the mobile edge platform, and from the virtualization manager ( Apply resources in the Virtualization infrastructure manager and load the corresponding mobile edge application. The Virtualization Infrastructure Manager is responsible for managing the virtual resources of the Virtualization Infrastructure in the edge host, allocating virtual resources, and loading mobile edge application software packages.

The interface Mp3 between the mobile edge hosts is used to support communication between the mobile edge hosts due to user movement, for example, context transfer of the mobile edge application instance between the old and new platforms after the user moves, or migration of the mobile edge application.

In a mobile network, because the terminal has mobility, the application is deployed to the edge of the network. In order to maintain the continuity of the service, sometimes the path is detoured (for example, the application still resides at the original access point after the terminal moves) .

In order to reduce the path non-optimization caused by such mobility, one method is to migrate the application to the user's current access point location when the terminal moves to a new location. Due to the wide range of virtualization technologies Use, application migration is not difficult. However, when an application needs to be processed according to the state of the user, simply migrating the application instance to a new location does not guarantee continuity of the business.

Summary of the invention

To solve the above technical problem, an embodiment of the present invention provides a method and device for migrating an application instance, and a computer storage medium.

The method for migrating an application instance provided by the embodiment of the present invention includes:

The source mobile edge host takes a snapshot of the source application instance;

Performing snapshot synchronization between the source mobile edge host and the destination mobile edge host, so that the destination mobile edge host will resume the snapshot synchronized to the destination mobile edge host;

The snapshot is a running space of the source application instance at a shooting time, and the running space includes a running process and status information.

In the embodiment of the present invention, the snapshot synchronization between the source mobile edge host and the destination mobile edge host includes:

The source mobile edge host compares the captured snapshot with the snapshot sent when the snapshot was last synchronized, and sends the two snapshot changes to the destination mobile edge host;

Wherein, when the transmission duration sent to the destination mobile edge host is greater than a set threshold, snapshot shooting and snapshot synchronization are performed again.

In the embodiment of the present invention, the method further includes:

After the snapshot is taken for the last time, the data packet sent by the terminal to the source application instance is saved, and the last transmission time corresponding to the snapshot shooting is less than or equal to the set threshold;

After the snapshot of the source application instance is restored to the destination application instance on the destination mobile edge host, the saved data packets are sent to the destination application instance in the saved order.

In the embodiment of the present invention, the source mobile edge host or the destination mobile edge host saves a data packet sent by the terminal to the source application instance;

After the snapshot is restored to the destination application instance on the destination mobile edge host, the data packet saved by the source mobile edge host or the data packet saved by the destination edge host and simultaneously sent to the source application instance is first The saved sequence is sent to the destination application instance; the data packets saved by the destination mobile edge host and not sent to the source application instance are sent to the destination application instance in the saved order.

A method for migration of an application instance provided by another embodiment of the present invention includes:

The mobile edge orchestrator sends a snapshot synchronization command to the source mobile edge sink and/or the destination mobile edge host;

The snapshot synchronization command is used to control snapshot synchronization between the source mobile edge host and the destination mobile edge host.

In the embodiment of the present invention, the method further includes:

The mobile edge orchestrator specifies a snapshot synchronization delay threshold when sending a snapshot synchronization command;

When the snapshot transmission duration is less than the snapshot synchronization delay threshold, the mobile edge orchestrator receives the snapshot synchronization complete message notified by the source mobile edge host or the destination mobile edge host.

In the embodiment of the present invention, the method further includes:

The mobile edge orchestrator sends an instantiated snapshot command to the destination mobile edge host;

The instantiated snapshot command is used to control the destination mobile edge host to perform instantiation of the snapshot.

The destination mobile edge host receives a snapshot of the source application instance sent by the source mobile edge host;

Restoring the snapshot to the destination application instance on the destination mobile edge sink;

Running the target application instance on the destination mobile edge host;

When the target application instance is run, the operation is performed according to the running process and the state information of the snapshot.

In the embodiment of the present invention, the method further includes:

Before the snapshot is restored to the destination application instance on the destination mobile edge sink, the data packet sent by the terminal to the destination application instance is saved;

After the snapshot is restored to the destination application instance on the destination mobile edge host, the saved data packets are sent to the destination application instance in the saved order.

In the embodiment of the present invention, the method further includes:

After the snapshot is restored to the destination application instance on the destination mobile edge host, the data packets saved by the source mobile edge host are first sent to the destination application instance in the saved order, and then the destination is moved. The data packets saved by the edge host are sent to the destination application instance in the order in which they are saved.

In the embodiment of the present invention, the method includes:

Setting a traffic filtering rule in the destination mobile edge host to send data sent by the terminal to the source application instance and/or the destination application instance to the destination application instance or destination mobile located on the destination mobile edge host according to the traffic filtering rule. The edge on the edge host computes the mobile service.

In the embodiment of the present invention, after the destination mobile edge host receives the instantiation snapshot request or completes the snapshot instantiation, the traffic filtering rule is set in the destination mobile edge host.

The device for migrating an application instance provided by the embodiment of the present invention includes:

A snapshot unit configured to take a snapshot of the source application instance;

a snapshot synchronization unit configured to perform snapshot synchronization between the source mobile edge host and the destination mobile edge host, so that the destination mobile edge host synchronizes the snapshot to the destination mobile edge host to resume operation;

The snapshot is an operation space of the source application instance at a shooting moment, and the operation is performed. The space includes operational processes and status information.

In the embodiment of the present invention, the snapshot synchronization unit is further configured to compare the captured snapshot with the snapshot sent when the snapshot was last synchronized, and send the changed portions of the two snapshots to the destination mobile edge host; When the transmission duration sent to the destination mobile edge host is greater than the set threshold, snapshot shooting and snapshot synchronization are performed again.

In the embodiment of the present invention, the device further includes:

a storage unit configured to save a data packet sent by the terminal to the source application instance after the snapshot is taken for the last time, and the sending duration corresponding to the last snapshot taking is less than or equal to a set threshold;

The sending unit is configured to send the saved data packets to the destination application instance in the saved order after the snapshot of the source application instance is restored to the destination application instance on the destination mobile edge host.

An apparatus for migrating an application instance provided by another embodiment of the present invention includes:

a sending unit, configured to send a snapshot synchronization command to the source mobile edge sink and/or the destination mobile edge host;

In the embodiment of the present invention, the device further includes:

Specifies a unit to be configured to specify a snapshot synchronization delay threshold when sending a snapshot synchronization command.

The receiving unit is configured to receive the snapshot synchronization completion message notified by the source mobile edge host or the destination mobile edge host when the snapshot transmission duration is less than the snapshot synchronization delay threshold.

In the embodiment of the present invention, the sending unit is further configured to send an instantiated snapshot command to the destination mobile edge host.

a receiving unit, configured to receive a snapshot of a source application instance sent by the source mobile edge host;

a recovery unit configured to restore the snapshot to the destination application instance on the device;

The running unit is configured to run the target application instance on the device; wherein, when the target application instance is run, running according to the running process and status information of the snapshot.

In the embodiment of the present invention, the device further includes:

a saving unit, configured to save the data packet sent by the terminal to the destination application instance before the snapshot is restored to the destination application instance on the device;

The sending unit is configured to send the saved data packet to the destination application instance in the saved order after the snapshot is restored to the destination application instance on the device.

In the embodiment of the present invention, the sending unit is further configured to: after the snapshot is restored to the target application instance on the device, send the data packet saved by the source mobile edge host to the storage device in the order of saving. The application example is described, and the data packets saved by the device are sent to the destination application instance in the order of saving.

In the embodiment of the present invention, the device further includes: a setting unit, configured to set a traffic filtering rule, to send, according to the traffic filtering rule, data sent by the terminal to the source application instance and/or the destination application instance to the destination mobile edge Destination application instance or destination moving edge on the host The edge on the host calculates the mobile service.

The embodiment of the present invention further provides a computer storage medium. The computer storage medium provided by the embodiment of the present invention stores a computer program, and the computer program is used to execute the method for migrating the application instance.

In the technical solution of the embodiment of the present invention, the source mobile edge host performs snapshot shooting on the source application instance; the source mobile edge host and the destination mobile edge host perform snapshot synchronization, so that the destination mobile edge host synchronizes to the destination moving edge. The snapshot on the host resumes running; wherein the snapshot is a running space of the source application instance at the time of shooting, and the running space includes running process and status information. The mobile edge host receives a snapshot of the source application instance sent by the source mobile edge host; restores the snapshot to the destination application instance on the destination mobile edge sink; and runs the destination application instance on the destination mobile edge host; When the target application instance is run, the operation is performed according to the running process and the state information of the snapshot. It can be seen that when the location of the terminal changes, the application instance is migrated from the source mobile edge host to the destination mobile edge host by using the snapshot mode, and the continuity of the application instance operation is ensured during the migration.

DRAWINGS

In the drawings, which are not necessarily to scale, the Like reference numerals with different letter suffixes may indicate different examples of similar components. The drawings generally illustrate the various embodiments discussed herein by way of example and not limitation.

Figure 1 is an architectural diagram of a mobile edge calculation;

2 is a schematic flowchart 1 of a method for migrating an application instance according to an embodiment of the present invention;

3 is a schematic flowchart 2 of a method for migrating an application instance according to an embodiment of the present invention;

4 is a structural block diagram of a mobile edge host according to an embodiment of the present invention;

FIG. 5 is a first schematic diagram of a method for migrating an application instance from a source host to a destination host using a snapshot method according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a system architecture corresponding to FIG. 5;

FIG. 7 is a schematic diagram 1 of interaction of a migration process according to an embodiment of the present invention;

FIG. 8 is a second schematic diagram of a method for migrating an application instance from a source host to a destination host by using a snapshot method according to an embodiment of the present invention; FIG.

Figure 9 is a schematic diagram of a system architecture corresponding to Figure 8;

FIG. 10 is a schematic diagram 2 of interaction of a migration process according to an embodiment of the present invention;

FIG. 11 is a first schematic structural diagram of a device for migrating an application instance according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram 2 of a device for migrating an application instance according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram 3 of a device for migrating an application instance according to an embodiment of the present invention.

detailed description

In the technical solution of the embodiments of the present invention, in order to ensure the business continuity before and after the application instance is migrated, the snapshot method is used to perform the migration of the application instance, that is, the snapshot of the source application instance is taken, so that when the application instance migration is required, Purpose Use a snapshot on the mobile edge host to restore the application instance to its pre-migration state.

2 is a schematic flowchart of a method for migrating an application instance according to an embodiment of the present invention. The method for migrating an application instance in this example is applied to a source mobile edge host. As shown in FIG. 2, the method for migrating the application instance includes the following steps. :

Step 201: Perform snapshot synchronization between the source mobile edge host and the destination mobile edge host.

Specifically, the source mobile application host takes a snapshot of the source application instance and copies the snapshot to a new mobile edge host to resume operation. Here, the new mobile edge host is referred to as the destination mobile edge host. The application instance in the source mobile edge host is referred to as the source application instance, and the application instance in the destination mobile edge host is referred to as the destination application instance. In order to reduce the time from snapshot of the source mobile edge host to the destination mobile edge host, in actual copy, only the partial copy of the snapshot between the mobile edge host and the application image (or snapshot) saved in the destination mobile edge host may be sourced. In the past, there was no need to copy the entire snapshot space.

Here, the snapshot is a running space of the source application instance at the time of shooting, and the running space includes running flow and status information.

Specifically, the snapshot means the running space of the application instance at a certain time, including all running code and status information. The photographing of the embodiment of the present invention specifically refers to the running space of the source application instance at the shooting time. As such, when the snapshot resumes running on the destination mobile edge host, the application instance will resume operation from the snapshot capture point.

The synchronization process occurs when the application instance is migrated, or before the application instance is migrated.

The synchronization process may include multiple iterative processes, such as:

When the first snapshot is synchronized, the source mobile edge host copies the entire snapshot to the destination mobile edge host;

During subsequent snapshot synchronization, the source mobile edge host compares the newly taken snapshot with the snapshot taken during the last synchronization and sends the changed portion to the destination mobile edge host.

The transmission delay required for this synchronization process is gradually reduced as the number of iterations increases. When the synchronization process requires a delay less than a certain threshold, the snapshot synchronization can be considered complete.

If the synchronization process occurs before the application instance is migrated, the snapshot synchronization interval is still performed between the source mobile edge host and the destination mobile edge host even if the snapshot synchronization delay is less than a certain threshold. The synchronization can be performed at a predetermined period (for example, 10 seconds).

Step 202: Instantiate the snapshot at the destination mobile edge host.

In the embodiment of the present invention, after the snapshot is synchronized and the application instance is completely restored in the target mobile edge host, if the application instance changes state, the state change during the period may also cause the service to be discontinuous.

For this reason, if the data packet still enters the source application instance after the snapshot is synchronized, all the data packets that have entered the source application instance after the synchronization of the snapshot are saved, until the data flow of the terminal is successfully switched to the destination application instance. During this process, the source mobile edge host can continue to respond to user responses. use. After the synchronized snapshot is restored by the destination mobile edge host, the source mobile edge host sends the saved data packets to the restored target application instance in the saved order. The purpose of the mobile edge host needs to confirm that all the data packets sent from the source mobile edge host are processed, and then the terminal is allowed to directly send the data packet to the destination application instance through the destination mobile edge host, if the destination mobile edge host receives the terminal directly for the purpose. Moving the edge host's data packet, the destination mobile edge host can temporarily cache the data packet until all data cached by the source mobile edge host is processed. In this way, the destination application instance can restore the state of the source mobile edge host breakpoint after processing all the packets sent by the source mobile edge host, so that the data can be processed from the breakpoint and the user's message can be restarted.

Based on this, in an embodiment of the present invention, after the snapshot synchronization is performed, the source edge computing platform saves the data packet sent by the terminal to the source application instance; when the snapshot of the source application instance is on the destination mobile edge host After being restored to the destination application instance, the saved data packets are sent to the destination application instance in the order in which they are saved.

Based on this, in another embodiment of the present invention, before the snapshot of the source application instance is restored to the destination application instance on the destination mobile edge host, the destination mobile edge host save terminal is notified to send to the application instance. Packet until the snapshot is restored to the destination application instance on the destination mobile edge host.

To ensure business continuity, the application needs to notify the user to update the IP address of the application, except that the application needs to restore the user's status information in the new application instance. If the application layer supports such a change in the IP address, the application layer may notify the terminal of the new IP address. If the application layer does not support the change of the IP address, the new mobile edge host needs to forward all the data packets whose source address is the user IP address and whose destination is the source mobile edge host to the new application instance restored on the new mobile edge host. Therefore, the new mobile edge host needs to configure the forwarding rules of the user plane, and the entire edge computing system avoids assigning the IP address to other application instances for a period of time. At the same time, the mobile edge computing platform updates the DNS system, and the application instance in the DNS The IP address corresponding to the domain name is updated to the IP address of the new application instance. After the DNS buffer of the user terminal expires, the terminal initiates DNS resolution. In this process, the terminal can obtain the IP address of the new instance, so that the IP packet can be directly sent to the new instance.

In the embodiment of the present invention, the snapshot method is used to migrate the application instance, and the application instance is guaranteed to be restored from the breakpoint (because the snapshot contains all the running information and running status information).

FIG. 3 is a schematic flowchart of a method for migrating an application instance according to an embodiment of the present invention. The method for migrating an application instance in this example is applied to a target mobile edge host. As shown in FIG. 3, the method for migrating the application instance includes the following steps. :

Step 301: Snapshot synchronization of the application instance between the destination mobile edge host and the source mobile edge host.

Step 302: Restore the snapshot synchronized to the destination mobile edge host to the destination application instance on the destination mobile edge sink.

In the embodiment of the present invention, the method further includes: saving the data packet sent by the terminal to the destination application instance before the snapshot is restored to the destination application instance on the destination mobile edge sink; After the target application instance is restored to the destination application instance, the saved data packets are sent to the destination application instance in the saved order.

Step 303: Run the target application instance on the destination mobile edge host.

Here, when the target application instance is run, the operation is performed according to the running process and the state information of the snapshot.

In the embodiment of the present invention, the method further includes: after the snapshot is restored to the destination application instance on the target mobile edge host, the data packet saved by the source mobile edge host is sent to the saved sequence in the order of saving. And the destination application instance, and then sending the data packet saved by the destination mobile edge host to the destination application instance according to the saved sequence.

To support seamless migration of snapshot-based application instances, add one to the mobile edge host The edge computing mobile service is shown in Figure 4. The edge computing mobile service obtains the user's mobile event from a radio network information service (RNIS) that resides on the mobile edge host. When the application is instantiated, if the application instance has a migration requirement, the system should register the application instance in the edge computing mobile service. The Edge Computing Mobile Service monitors the mobile events of users of all registered application instances. Once the edge computing mobile service detects that a user of an application instance has cross-host switching, the edge computing mobile service notifies the mobile edge orchestrator. In addition, during the application instance migration process, the edge computing mobile service temporarily caches the data sent by the user to the application instance, and after the application instance is restored, the edge computing mobile service sequentially sends the cached data to the destination application for processing.

At the same time, in order to support the migration of seamless application instances, the virtualization architecture needs to support the ability to take snapshots and snapshot synchronization. In addition, the mobile edge arranger and the virtual architecture manager need to support recovery of the snapshot, including allocating resources according to the application configuration file of the original application package corresponding to the application instance, and loading the captured snapshot on the allocated resource, according to the configuration. The additional environment variables for files and snapshots make the necessary configuration of the snapshot.

In the following various embodiments of the present invention, the source mobile edge host is simply referred to as a source host, and the destination mobile edge host is simply referred to as a destination host.

Figure 5 depicts a schematic diagram of a method of migrating an application instance from a source host to a destination host using a snapshot method. In Figure 5, the terminal switches from the base station to which the source host is associated to the base station to which the destination host is associated.

1. The data sent by the terminal to the source application instance is forwarded to the source host through the destination host.

2. After the mobile edge orchestrator decides to perform the application instance migration, the notification source and the destination host perform snapshot synchronization.

3. When the snapshot synchronization delay is less than a certain threshold, the destination host instantiates the snapshot. The destination host also starts the data cache at the same time.

4. After the destination host instantiates the snapshot, the cached data is sent to the restored application. The instance is processed. After the cached data is processed, the destination host sends the data directly to the restored application instance.

Figure 6 is a schematic diagram of the system architecture corresponding to Figure 5. The source application instance 102 is located at the source host 101, and the virtualization framework 104 located in the source host 101 is responsible for taking snapshots 105 of the source application instance 102. The snapshot 105 is copied to the destination host 106 during the migration process and restored to the destination application instance 107. Before the destination application instance 107 is successfully restored, the edge computing mobile service 110 located in the edge computing platform 108 in the destination host 106 is responsible for buffering the data sent by the terminal to the destination application instance 107, and the data is stored in the cache in the edge computing mobile service 110. . After the destination application instance 107 is successfully restored, the edge computing mobile service 110 sends the cached data to the destination application instance 107 in order. In the specific instance migration process, the source platform manager 111 and the source virtualization architecture manager 112 responsible for the source host 101, the destination platform manager 113 responsible for the destination host 106, the destination virtualization architecture manager 114, and the mobile edge computing orchestration The router 115, and the edge computing platform 103 located in the source host 101, will all participate in the migration process. In addition, the source host 101 and the destination host 106 are relatively speaking, and the destination host 106 can also implement the function of the source host 101. Accordingly, the source host 101 can also implement the function of the destination host 106. Based on such understanding, the destination host 106 The same also includes the virtualization architecture 109.

FIG. 7 is a schematic diagram 1 of interaction of a migration process according to an embodiment of the present invention. In FIG. 7, an edge computing mobile service and a wireless network information service are all located in a mobile edge host. The source VIM refers to the source virtualization manager, and the destination VIM refers to the destination virtualization manager. The migration process includes the following steps:

1. Before the terminal switches, the application on the terminal communicates with the source instance located at the source host. Before the snapshot is migrated, the terminal has switched to the base station associated with the destination host. The communication between the terminal and the source instance is forwarded to the source host through the destination host, and then forwarded to the source application instance by the source host.

2. The mobile edge orchestrator decides to initiate the migration of the application instance. The mobile edge orchestrator decides whether to apply the application instance according to the requirements of the application instance (such as delay, load), the attributes of the target host, and the like. Migrate to the destination host and select the destination host for the application. The mobile edge orchestrator sends a snapshot migration request message to the edge platform manager corresponding to the source host.

3. The edge platform manager corresponding to the source host sends a snapshot migration preparation message to the virtual infrastructure manager associated with the source host.

4. The virtual infrastructure manager associated with the source host prepares a snapshot, and prepares to synchronize the snapshot to send a response message to the edge platform manager corresponding to the source host. In order to ensure communication security, the virtual infrastructure manager associated with the source host can assign a token to the subsequent synchronization, and the token is sent to the virtual infrastructure manager associated with the destination host through the mobile edge orchestrator, and subsequently When the snapshot is synchronized, the virtual fabric manager associated with the source host is sent so that the virtual fabric manager associated with the source host validates the snapshot synchronization request.

5. The virtual infrastructure manager associated with the source host sends a response message to the mobile edge orchestrator. The virtual infrastructure manager associated with the source host sends information about the virtual infrastructure manager associated with the source host, such as URL, IP address, token, etc., to the mobile edge orchestrator.

6. The mobile edge orchestrator sends a request for snapshot migration to the edge platform manager corresponding to the destination host, where the request carries the information of the application instance to be migrated and the information of the source host. The mobile edge arranger can set the snapshot synchronization delay. When the time required for the snapshot synchronization is less than the set snapshot synchronization delay, the destination host stops the subsequent snapshot synchronization, and stops sending the data from the terminal to the source application instance. And start to restore a snapshot of the application instance on the destination host. In order to reduce the snapshot recovery delay, the mobile edge orchestrator can request the destination edge platform manager to allocate virtual computing, storage and network resources for the application instance to be migrated.

7. The destination edge platform manager sends a synchronous snapshot request to the virtual infrastructure manager associated with the destination host. Based on the request of the mobile edge orchestrator, the destination edge platform manager also requests the virtual infrastructure manager associated with the destination host to allocate virtual computing, storage, and network resources.

8. The virtual infrastructure manager associated with the destination host sends a response message to the destination edge platform manager for the virtual infrastructure manager associated with the destination host to be migrated. Alternatively, the destination host The associated virtual fabric manager allocates virtual computing, storage, and network resources as needed, prepares the virtual machine, and waits for the migration of the application instance.

9. The virtual infrastructure manager associated with the destination host initiates a snapshot of the synchronized application instances between the virtual fabric managers associated with the source host. In the specific implementation, if the image of the application (original image) has been saved in the virtual infrastructure manager associated with the destination host, in order to shorten the snapshot synchronization time, the virtual infrastructure manager associated with the source host only needs to apply the source application instance. The snapshot is sent to the virtual infrastructure manager associated with the destination host in a different part of the original image in the virtual fabric manager associated with the destination host (ie, the portion that changed during runtime). If the snapshot synchronization time is greater than the snapshot synchronization delay set by the mobile edge orchestrator, the virtual infrastructure manager associated with the destination host and the virtual infrastructure manager associated with the source host further synchronize the changes of the application instance snapshot (on the last synchronization) The change that occurred during the period) until the image synchronization time is less than the snapshot synchronization delay.

10. The virtual infrastructure manager associated with the destination host sends the snapshot synchronization completion to the destination edge platform manager. Optionally, the destination edge platform manager can send the message to the mobile edge orchestrator.

11. The destination edge platform manager commands the edge computing platform to cache data for the application. The edge computing platform configures a forwarding plane filter to redirect data sent to the application instance being migrated to the edge computing mobile service located at the edge computing platform and cache it. If the snapshot recovery time is long, you can consider sending the data to the source application instance while the data is cached locally, so as to shorten the service interruption caused by the application instance migration, and the service on the terminal does not sense the migration of the application instance.

12. In step 10, the snapshot synchronization completion message is sent to the mobile edge orchestrator, and the mobile edge orchestrator sends a command to instantiate the application snapshot to the destination virtual architecture manager through the destination edge platform manager; otherwise, the destination edge platform The manager sends a command to instantiate the application snapshot directly to the destination virtual infrastructure manager.

13. The destination virtual architecture manager allocates the required computing, storage, and network resources for the application snapshot to be virtualized, and copies the snapshot to be restored to the allocated resource to resume operation, and performs necessary recovery on the restored snapshot. Configuration, such as configuring an IP address for it. After the snapshot resumes running, the destination virtual architecture manager sends an instantiation completion response message to the destination edge platform manager.

14. The destination edge platform manager sends an instance recovery notification to the edge computing platform in the destination host.

After receiving the instance recovery notification from the destination edge platform manager, the edge computing platform in the destination host sends the data cached by the application instance to the restored target application instance in sequence. Moreover, the edge computing platform in the destination host updates the forwarding rule, and redirects the data sent by the terminal to the source or destination application instance to the destination application instance. At this time, the destination address of the data packet sent by the terminal to the application instance may be the address of the source application instance or the address of the new application instance. Before the terminal updates the destination address of the application, the terminal still sends data to the address of the source application instance. The edge platform should be configured to allow the data sent by the terminal to the source application instance address to be sent to the destination application instance. If the destination host forwards the data to the source application while the data is being cached, the destination host should discard any response data triggered by the cached data packet until the locally cached data is processed and the target application instance is started. The response packet is sent to the terminal.

16. The edge computing platform in the destination host sends a response message to the destination edge platform manager.

17. The destination edge platform manager sends a snapshot migration complete message to the mobile edge orchestrator.

18. The mobile edge orchestrator sends an instance termination request message to the source edge platform manager to terminate the source application instance.

19. The source edge platform manager sends an instance termination notification message to the edge computing platform in the source host.

20. The edge computing platform in the source host sends a final instance notification to the source application instance, so that the source application instance can gracefully close.

21. Edge calculation in the source host after the source application instance finishes preparing for shutdown The platform deletes configuration information such as DNS rules and traffic filtering rules configured for the source application instance, and sends the instance termination completion to the source edge platform manager.

22. The source edge platform manager commands the virtual infrastructure manager associated with the source host to release the resources occupied by the source instance.

23. After the virtual infrastructure manager associated with the source host releases the resources occupied by the completed instance, the source edge platform manager notifies the mobile edge orchestrator that the snapshot migration is completed.

24. Direct communication between the terminal and the destination application instance.

Figure 8 depicts another schematic diagram of a method of migrating an application instance from a source host to a destination host using a snapshot method. In FIG. 8, the mobile edge orchestrator predicts the moving direction of the terminal, and notifies the source and destination mobile edge hosts to perform snapshot synchronization in advance before the terminal switches to the new location, so as to quickly switch to the destination mobile edge host when the terminal actually switches. When the switch actually occurs, a sufficiently new snapshot has been saved on the destination mobile edge host, and the mobile edge orchestrator can directly command the destination mobile edge host to instantiate the locally synchronized snapshot. In order to ensure that the application instance on the mobile edge host can recover from the breakpoint, the source host needs to cache the data packet that was processed by the last snapshot shooting point, so that the running snapshot will be resumed on the destination host (ie, the destination application instance). The status is updated to be the same as the source application. The steps in the embodiment of Figure 8 are as follows:

1. A synchronized snapshot between the source host and the destination host. The mobile edge orchestrator determines which destination hosts the source host synchronizes the snapshot to based on the prediction of the terminal's movement trajectory.

2. After each snapshot is taken, the source host starts the data cache, and the data sent to the source application instance is cached locally until the snapshot is taken or the application instance is migrated.

3. The source host receives a notification message that the terminal from the source base station is ready to switch.

4. Move Edge Composer Command The destination host instantiates a locally saved snapshot (last synchronized to a local snapshot).

5. The source application on the source host continues to serve the terminal until the snapshot is restored in the destination host, and the destination host initiates local caching.

6. The source host sends the locally cached data to the destination host. After the application instance is restored in the target host, the destination host first sends the cached data sent from the source host to the destination application instance in sequence, and then sends the locally cached data directly sent from the terminal to the destination application instance.

Figure 9 is a schematic diagram of the system architecture corresponding to Figure 8. The source application instance 102 is located at the source host 101, and the virtualization framework 104 located in the source host 101 is responsible for taking snapshots 105 of the source application instance 102. The snapshot 105 is copied to the destination host 106 during the migration process and restored to the destination application instance 107. After the source host 101 takes a snapshot of the source application instance 102, the edge computing mobile service 116 in the edge computing platform 103 in the source host 101 begins to buffer the data sent to the source application instance. After the target application instance 107 is successfully restored, the edge computing platform 108 of the destination host caches the data sent to the source or destination application instance before processing the cached data of the source host 101. After the target application instance 107 is successfully restored, the edge computing platform 108 firstly sends the data received from the source host to the destination application instance 107 in sequence, and then sequentially sends the locally buffered data directly received by the terminal to the destination application instance 107. . In the specific instance migration process, the source platform manager 111 and the source virtualization architecture manager 112 responsible for the source host 101, the destination platform manager 113 responsible for the destination host 106, the destination virtualization architecture manager 114, and the mobile edge computing The arranger 115 will all participate in the migration process.

FIG. 10 is a schematic diagram of interaction of a migration process according to an embodiment of the present invention. In FIG. 8, an edge computing mobile service, a wireless network information service, and a Service Registry are all located in a mobile edge host. The source VIM refers to the source virtualization manager, and the destination VIM refers to the destination virtualization manager; the migration process includes the following steps:

1. The application on the terminal communicates with the source instance located at the source host. The communication between the terminal and the source instance is forwarded to the source application instance through the source host, or forwarded to the source host through the destination host, and then forwarded to the source application instance by the source host.

2. Snapshot synchronization between the source virtualization manager and the destination virtualization manager. The mobile orchestrator decides which virtualization managers to synchronize snapshots as needed. Mobile organizer can be based on the end The behavior of the terminal, such as the movement trajectory and the historical movement rule of the terminal, determines which base stations the terminal is to switch to, and then decides whether to synchronize the snapshot of the application instance to the host associated with the target base station in advance to accelerate the migration of the application instance during the handover process. . After the delay of snapshot synchronization between the source virtualization manager and the destination virtualization manager is less than a certain threshold, periodic snapshot synchronization is performed between the source and destination virtualization managers.

3. At each snapshot, the edge computing platform in the source host starts the data caching function, and the cache is from the time of the snapshot to the next snapshot or from the last snapshot until the end user data is switched to the destination host. The received data sent by the terminal to the application instance is used to restore the destination application instance to the state of the source application instance before the terminal is switched off by using the cached data.

4. The edge computing platform in the source host receives the mobile event of the terminal. The mobile event indicates that the terminal is ready to switch or the terminal has switched off.

5. The edge computing platform in the source host reports the mobile event of the terminal to the mobile edge orchestrator through the source host platform manager. The mobile event includes a terminal ID in which a mobile event occurs, an application instance that the terminal is accessing, information of the target base station, and the like.

6. The mobile edge orchestrator decides whether to initiate the migration of the application instance. The mobile edge orchestrator decides whether to migrate the application instance to the destination host according to the requirements of the application instance (such as delay, load) that the terminal that the terminal is moving, and the attributes of the destination host, and selects the destination host for the application. If the mobile edge orchestrator decides to migrate the application instance, the mobile edge orchestrator sends an instantiated snapshot command to the corresponding edge platform manager of the destination host.

7. The destination edge platform manager sends an instantiation snapshot request to the virtual infrastructure manager associated with the destination host.

8. The virtual infrastructure manager associated with the destination host allocates the required computing, storage, and network resources to the snapshot, and copies the snapshot to the allocated resources to resume operation, and performs necessary configuration on the snapshot, for example, It is configured with an IP address, etc.

9. The destination edge platform manager sends an instance recovery notification to the edge computing platform in the destination host.

10. The edge computing platform in the destination host notifies the destination application instance that the recovery is complete.

11. The edge computing platform in the destination host configures the local forwarding rule to redirect the data sent to the source application instance and the destination application instance to the local edge computing platform, and the local edge computing platform starts to cache the data. The edge computing platform in the destination host sends a response message to the destination edge platform manager.

12. The destination edge platform manager sends an instantiated snapshot completion message to the mobile edge orchestrator.

13. The mobile edge orchestrator sends a forwarding cache data request message to the source edge computing platform by using the source platform manager, and requests the source edge computing platform to send the locally cached data to the destination edge platform.

14. The source edge computing platform sends the cached data to the destination edge computing platform in the order of the cache, and then sends the data to the destination application instance by the destination edge computing platform. During this period, the destination application instance processes the cached data packet and the outgoing data packets are set to be discarded, thereby preventing the terminal from receiving duplicate data packets. Until the destination edge computing platform determines that all cached data has been processed, the destination edge computing edge platform is enabled to allow the destination application to send data packets to the terminal.

15. After processing the cached data of the source edge computing platform, the destination edge computing platform sends the locally cached data to the destination application in sequence. After all the locally cached data is processed, the destination edge computing platform configures the forwarding rule to send all data sent to the destination or source application instance directly to the destination application instance without local caching.

16. The mobile edge orchestrator sends a final instance command to the source platform manager.

17. The source platform manager notifies the source host of the edge computing platform to terminate the instance.

18. Optionally, the edge computing platform in the source host sends a final instance notification to the source application instance, so that the source application instance can be gracefully closed.

19. Edge calculation in the source host after the source application instance finishes preparing for shutdown The platform sends an instance termination completion to the source edge platform manager.

20. The source edge platform manager commands the virtual infrastructure manager associated with the source host to release the resources occupied by the source instance.

21. After the virtual infrastructure manager associated with the source host releases the resources occupied by the completed instance, the source edge platform manager notifies the mobile edge orchestrator instance that the termination is complete.

22. Direct communication between the terminal and the destination application instance.

FIG. 11 is a first schematic structural diagram of a device for migrating an application instance according to an embodiment of the present invention. As shown in FIG. 11, the device includes:

The snapshot unit 1101 is configured to take a snapshot of the source application instance;

The snapshot synchronization unit 1102 is configured to perform snapshot synchronization between the source mobile edge host and the destination mobile edge host, so that the destination mobile edge host synchronizes the snapshot to the destination mobile edge host to resume operation;

The snapshot synchronization unit 1102 is further configured to compare the captured snapshot with the snapshot sent when the snapshot was last synchronized, and send the changed portions of the two snapshots to the destination mobile edge host; wherein, when sent to the destination mobile When the edge host's transmission duration is greater than the set threshold, snapshot shooting and snapshot synchronization are performed again.

The device further includes:

The storage unit 1103 is configured to: after the snapshot is taken for the last time, save the data packet sent by the terminal to the source application instance, where the last transmission time corresponding to the snapshot shooting is less than or equal to the set threshold;

The sending unit 1104 is configured to send the saved data packets to the destination application instance in the saved order after the snapshot of the source application instance is restored to the destination application instance on the destination mobile edge host.

The source mobile edge host or the destination mobile edge host saves a data packet sent by the terminal to the source application instance;

In a practical application, the functions implemented by each unit in the device migrated by the application instance may be a Central Processing Unit (CPU) or a Micro Processor Unit in a device migrated by the application instance. , MPU), or Digital Signal Processor (DSP), or Field Programmable Gate Array (FPGA) implementation.

FIG. 12 is a second structural diagram of a device for migrating an application instance according to an embodiment of the present invention. As shown in FIG. 12, the device includes:

The receiving unit 1201 is configured to receive a snapshot of the source application instance sent by the source mobile edge host;

The recovery unit 1202 is configured to restore the snapshot to the destination application instance on the device;

The running unit 1203 is configured to run the target application instance on the device. When the target application instance is run, the running is performed according to the running process and status information of the snapshot.

The device further includes:

The saving unit 1204 is configured to save the data packet sent by the terminal to the destination application instance before the snapshot is restored to the destination application instance on the device.

The sending unit 1205 is configured to: after the snapshot is restored to the destination application instance on the device, send the saved data packet to the destination application instance in a saved sequence.

The sending unit 1205 is further configured to: after the snapshot is restored to the destination application instance on the device, first send the data packets saved by the source mobile edge host according to the saved sequence And sending the data packet saved by the device to the destination application instance according to the saved sequence.

The device further includes: a setting unit 1206, configured to set a traffic filtering rule, to send data sent by the terminal to the source application instance and/or the destination application instance to the destination application located on the destination mobile edge host according to the traffic filtering rule. The instance or destination moves the edge on the mobile host to calculate the mobile service.

In practical applications, the functions implemented by each unit in the device migrated by the application instance may be implemented by a CPU, an MPU, or a DSP, or an FPGA in a device migrated by the application instance.

FIG. 13 is a third structural diagram of a device for migrating an application instance according to an embodiment of the present invention. As shown in FIG. 13, the device includes:

The sending unit 1301 is configured to send a snapshot synchronization command to the source mobile edge sink and/or the destination mobile edge host;

The device further includes:

The specifying unit 1302 is configured to: when the snapshot synchronization command is sent, specify a snapshot synchronization delay threshold;

The receiving unit 1303 is configured to receive the snapshot synchronization completion message notified by the source mobile edge host or the destination mobile edge host when the snapshot transmission duration is less than the snapshot synchronization delay threshold.

The sending unit 1301 is further configured to send an instantiated snapshot command to the destination mobile edge host;

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Correspondingly, an embodiment of the present invention further provides a computer storage medium, wherein a computer program is configured, and the computer program is configured to perform a method for migrating an application instance in the embodiment of the present invention.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

In the technical solution of the embodiment of the present invention, the source mobile edge host performs snapshot shooting on the source application instance; the source mobile edge host synchronizes with the target mobile edge host to synchronize the target mobile edge host to the destination mobile edge host. The snapshot is resumed; wherein the snapshot is a running space of the source application instance at the time of shooting, and the running space includes running process and status information. The mobile edge host receives a snapshot of the source application instance sent by the source mobile edge host; restores the snapshot to the destination application instance on the destination mobile edge sink; and runs the destination application instance on the destination mobile edge host; When the target application instance is run, the operation is performed according to the running process and the state information of the snapshot. It can be seen that when the location of the terminal changes, the application instance is migrated from the source mobile edge host to the destination mobile edge host by using the snapshot mode, and the continuity of the application instance operation is ensured during the migration.

Claims

A method of applying instance migration, the method comprising:

The source mobile edge host takes a snapshot of the source application instance;

Performing snapshot synchronization between the source mobile edge host and the destination mobile edge host, so that the destination mobile edge host will resume the snapshot synchronized to the destination mobile edge host;

The snapshot is a running space of the source application instance at a shooting time, and the running space includes a running process and status information.
The method for applying instance migration according to claim 1, wherein the snapshot synchronization between the source mobile edge host and the destination mobile edge host comprises:

The source mobile edge host compares the captured snapshot with the snapshot sent when the snapshot was last synchronized, and sends the two snapshot changes to the destination mobile edge host;

Wherein, when the transmission duration sent to the destination mobile edge host is greater than a set threshold, snapshot shooting and snapshot synchronization are performed again.
The method of applying an instance migration according to claim 2, wherein the method further comprises:

After the snapshot is taken for the last time, the data packet sent by the terminal to the source application instance is saved, and the last transmission time corresponding to the snapshot shooting is less than or equal to the set threshold;

After the snapshot of the source application instance is restored to the destination application instance on the destination mobile edge host, the saved data packets are sent to the destination application instance in the saved order.
The method for migrating an application instance according to claim 3, wherein the data packet sent by the save terminal to the source application instance is: the source mobile edge host or the destination mobile edge host save terminal sends to the a data packet describing the source application instance;

After the snapshot of the source application instance is restored to the destination application instance on the destination mobile edge host, the saved data packets are sent to the The application example includes: after the snapshot is restored to the destination application instance on the destination mobile edge host, first, the source mobile edge host sends the data packets saved by the source mobile edge host according to the saved sequence. Applying the destination application instance, or the destination edge host sends the data packet saved by the destination edge host and simultaneously sent to the source application instance to the destination application instance according to the saved sequence; then, the destination mobile The edge host sends the data packets saved by the destination mobile edge sink and not sent to the source application instance to the destination application instance in the saved order.
A method of applying instance migration, the method comprising:

The mobile edge orchestrator sends a snapshot synchronization command to the source mobile edge host and/or the destination mobile edge host;

The snapshot synchronization command is used to control snapshot synchronization between the source mobile edge host and the destination mobile edge host.
The method of applying the instance migration according to claim 5, wherein the method further comprises:

The mobile edge orchestrator specifies a snapshot synchronization delay threshold when sending a snapshot synchronization command;

When the snapshot transmission duration is less than the snapshot synchronization delay threshold, the mobile edge platform manager corresponding to the mobile edge or the mobile edge host receives the snapshot synchronization notified by the source mobile edge host or the destination mobile edge host Complete the message.
The method of applying the instance migration according to claim 5 or 6, wherein the method further comprises:

The mobile edge platform manager corresponding to the mobile edge or the mobile edge host sends an instantiated snapshot command to the destination mobile edge host;

The instantiated snapshot command is used to control the destination mobile edge host to perform instantiation of the snapshot.
A method of applying instance migration, the method comprising:

The destination mobile edge host receives a snapshot of the source application instance sent by the source mobile edge host;

Restoring the snapshot to the destination application instance on the destination mobile edge sink;

Running the target application instance on the destination mobile edge host;

When the target application instance is run, the operation is performed according to the running process and the state information of the snapshot.
The method of applying an instance migration according to claim 8, wherein the method further comprises:

Before the snapshot is restored to the destination application instance on the destination mobile edge sink, the data packet sent by the terminal to the source application instance and/or the destination application instance is saved;

After the snapshot is restored to the destination application instance on the destination mobile edge host, the saved data packets are sent to the destination application instance in the saved order.
The method of applying the instance migration according to claim 9, wherein the method further comprises:

After the snapshot is restored to the destination application instance on the destination mobile edge host, the data packets saved by the source mobile edge host are first sent to the destination application instance in the saved order, and then the destination is moved. The data packets saved by the edge host are sent to the destination application instance in the order in which they are saved.
The method of applying instance migration according to claim 8, wherein

Setting a traffic filtering rule in the destination mobile edge host, and sending data sent by the terminal to the source application instance and/or the destination application instance according to the traffic filtering rule to the destination application instance or the destination moving edge located on the destination mobile edge host The edge on the host calculates the mobile service.
The method for applying instance migration according to claim 11, wherein the traffic filtering rule is set in the destination mobile edge host after the destination mobile edge host receives the instantiation snapshot request or completes the snapshot instantiation.
The method for applying instance migration according to claim 11, wherein after the edge on the destination mobile edge host calculates the mobile service uncached data and the source mobile edge host also has no cached data, the target mobile edge host is set Traffic filtering rules.
A device for application instance migration, the device comprising:

A snapshot unit configured to take a snapshot of the source application instance;

a snapshot synchronization unit configured to perform snapshot synchronization between the source mobile edge host and the destination mobile edge host, so that the destination mobile edge host synchronizes the snapshot to the destination mobile edge host to resume operation;

The snapshot is a running space of the source application instance at a shooting time, and the running space includes a running process and status information.
The device for migrating an application instance according to claim 14, wherein the snapshot synchronization unit is further configured to compare the captured snapshot with a snapshot sent when the snapshot was last synchronized, and change the portion of the two snapshots. Send to the destination mobile edge host; wherein, when the transmission duration sent to the destination mobile edge host is greater than a set threshold, snapshot shooting and snapshot synchronization are performed again.
The device of the application instance migration according to claim 15, wherein the device further comprises:

a storage unit configured to save a data packet sent by the terminal to the source application instance after the snapshot is taken for the last time, and the sending duration corresponding to the last snapshot taking is less than or equal to a set threshold;

The sending unit is configured to send the saved data packets to the destination application instance in the saved order after the snapshot of the source application instance is restored to the destination application instance on the destination mobile edge host.
The device for application instance migration according to claim 16, wherein the source mobile edge host or the destination mobile edge host save terminal sends the source application instance data pack;

After the snapshot is restored to the destination application instance on the destination mobile edge host, the data packet saved by the source mobile edge host or the data packet saved by the destination edge host and simultaneously sent to the source application instance is first The saved sequence is sent to the destination application instance; the data packets saved by the destination mobile edge host and not sent to the source application instance are sent to the destination application instance in the saved order.
A device for application instance migration, the device comprising:

a sending unit, configured to send a snapshot synchronization command to the source mobile edge sink and/or the destination mobile edge host;

The snapshot synchronization command is used to control snapshot synchronization between the source mobile edge host and the destination mobile edge host.
The device of the application instance migration according to claim 18, wherein the device further comprises:

Specifies a unit to be configured to specify a snapshot synchronization delay threshold when sending a snapshot synchronization command.

The receiving unit is configured to receive the snapshot synchronization completion message notified by the source mobile edge host or the destination mobile edge host when the snapshot transmission duration is less than the snapshot synchronization delay threshold.
The device of the application instance migration according to claim 18 or 19, wherein the sending unit is further configured to send an instantiated snapshot command to the destination mobile edge host;

The instantiated snapshot command is used to control the destination mobile edge host to perform instantiation of the snapshot.
A device for application instance migration, the device comprising:

a receiving unit, configured to receive a snapshot of a source application instance sent by the source mobile edge host;

a recovery unit configured to restore the snapshot to the destination application instance on the device;

a running unit configured to run the target application instance on the device; When the destination application instance is executed, the operation is performed according to the running process and status information of the snapshot.
The device of the application instance migration according to claim 21, wherein the device further comprises:

a saving unit, configured to save the data packet sent by the terminal to the destination application instance before the snapshot is restored to the destination application instance on the device;

The sending unit is configured to send the saved data packet to the destination application instance in the saved order after the snapshot is restored to the destination application instance on the device.
The apparatus for migrating an application instance according to claim 22, wherein the sending unit is further configured to: after the snapshot is restored to the destination application instance on the device, first save the data saved by the source mobile edge host The packets are sent to the destination application instance in the order in which they are saved, and the data packets saved by the device are sent to the destination application instance in the order in which they are saved.
The device of the application instance migration according to claim 22, wherein the device further comprises: a setting unit configured to set a traffic filtering rule to send the terminal to the source application instance and/or the destination application according to the traffic filtering rule The data of the instance is sent to the edge computing mobile service on the destination application instance or the destination mobile edge host located on the destination mobile edge host.
A computer storage medium having stored therein computer executable instructions configured to perform the method of application instance migration of any of claims 1-4, or configured to enforce the claims The method of application instance migration according to any one of claims 5 to 7, or the method of performing the application instance migration according to any one of claims 8-13.