CN115499385A - Method for avoiding packet loss in vDPA virtual machine thermal migration - Google Patents
Method for avoiding packet loss in vDPA virtual machine thermal migration Download PDFInfo
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- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L41/20—Network management software packages
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- H—ELECTRICITY
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Abstract
The invention relates to the technical field of virtual machine migration, and provides a method for avoiding packet loss in vDPA virtual machine live migration, which comprises the following steps: pushing the main dirty pages on the source host to the target host according to the hot migration request; migrating the flow from the vDPA network card of the source host to a cache network card of the target host through the virtual switch of the source host, and starting to capture a cache message and store the cache message into the cache network card by the target host; pausing a virtual machine of a source host, and pushing all the residual dirty pages on the source host to a target host; after pushing all dirty pages, starting the virtual machine of the target host, sending the cache message to the vDPA network card, migrating the flow to the vDPA network card, and completing virtual machine migration. According to the method for avoiding packet loss in the vDPA virtual machine live migration in the exemplary embodiment of the present invention, the problem of packet loss during live migration can be solved, and it is ensured that no packet is lost during the whole live migration of the virtual machine.
Description
Technical Field
The invention relates to the technical field of virtual machine migration, in particular to a method for avoiding packet loss in vDPA virtual machine live migration.
Background
virtio is a standard semi-virtualization IO equipment model and is widely used for virtualization of networks, storage and the like in cloud computing. To solve the performance bottleneck problem, manufacturers such as red hat, mei luo si, intel, etc. propose a vDPA (virtual data path access, generally referred to as virtual network data layer hardware acceleration) network solution. The vDPA is divided into a control channel and a data channel, and the control channel is realized according to the custom format of each manufacturer, so that the development difficulty of the manufacturer is simplified; the data channel is implemented in compliance with the vrithio protocol. The vDPA is currently based on the Intel CPU and Michelson double-port 25G optical card test, and 64-byte small packets can reach 31Mpps.
As shown in fig. 1, a disadvantage of the vDPA network solution applied to the virtual machine live migration scenario is that packet loss still occurs, and the packet loss needs to be protected by a client at a transmission layer or even an application layer, otherwise abnormal service operation may be caused. However, such a literary composition protected based on a transport layer or even an application layer has a high technical requirement on a user, increases the development cost of a user service program, and may even reduce the stable behavior of the program, so that the solution is not suitable for users of small-scale applications. In addition, if the virtual machine runs in a DPI service (deep packet inspection), the packet is only sent once and is not retransmitted, and once the packet is lost, irreparable harm can be caused. In the application scenario, a user has no way to solve the problem of packet loss during the live migration from the perspective of a service program.
Therefore, how to provide a solution that does not lose packet in virtual machine live migration becomes a technical problem to be solved urgently.
Disclosure of Invention
In view of this, in order to overcome the defects in the prior art, the present invention provides a solution for avoiding packet loss in vDPA virtual machine live migration, where the vDPA virtual machine ensures that no packet is lost, and thus, service of the user side is prevented from being affected by virtual machine live migration.
The invention discloses a method for avoiding packet loss in vDPA virtual machine live migration, which comprises the following steps:
step S1: pushing the main dirty pages on the source host to the target host according to the hot migration request;
step S2: migrating the flow from the vDPA network card of the source host to a cache network card of the target host through the virtual switch of the source host, and starting to capture a cache message and store the cache message into the cache network card by the target host;
and step S3: pausing a virtual machine of a source host machine, and pushing all residual dirty pages on the source host machine to a target host machine;
and step S4: and after pushing all dirty pages, starting the virtual machine of the target host, sending the cache message to the vDPA network card, and migrating the flow to the vDPA network card to complete virtual machine migration.
Further, step S1 of the method for avoiding packet loss in vDPA virtual machine live migration of the present invention includes:
the method comprises the steps that a user side sends a live migration request to source host virtualization management software according to the running state of a source host;
after receiving the live migration request, the source host virtualization management software establishes SOCKET connection with the target host virtualization management software;
creating a cache network card and starting a cache program by the virtualization management software of the target host;
the source host virtualization management software pushes dirty pages corresponding to source host virtual machines needing to be migrated to target host virtualization management software;
after one-time pushing is finished, continuously pushing dirty pages generated in the last pushing period;
and continuously repeating pushing, when the size of the pushed dirty pages is smaller than a set value, judging that the pushing of the main dirty pages is finished, and stopping the pushing of the dirty pages.
Further, step S2 of the method for avoiding packet loss in vDPA virtual machine live migration of the present invention includes: and the source host virtualization management software informs the source host virtual switch of migrating the flow to the cache network card, stops receiving and transmitting the flow between the source host virtual switch and the source host vDPA network card, migrates the flow to the target host virtual switch, and continuously receives and transmits the flow between the target host virtual switch and the cache network card of the target host.
Further, step S3 of the method for avoiding packet loss in vDPA virtual machine live migration of the present invention includes: and pausing the virtual machine of the source host, sending the dirty page before pausing of the virtual machine of the source host to the virtualization management software of the target host by adopting the virtualization management software of the source host, and informing the virtualization management software of the target host of completing the pushing of the dirty page by the virtualization management software of the source host.
Further, step S4 of the method for avoiding packet loss in vDPA virtual machine live migration of the present invention includes:
after receiving the notice of completion of pushing the dirty pages, the target host virtualization management software starts a target host virtual machine and simultaneously starts a target host vDPA network card;
after the target host virtual machine is started, the target host virtual machine management software informs the target host cache network card to send a cache message, and the target host cache network card sends the cache message to the target host vDPA network card;
and informing the target host virtual switch of migrating the flow to the target host vDPA network card through the target host virtualization management software, stopping the flow transceiving between the target host virtual switch and the cache network card, and migrating the flow in the target host cache network card to the target host vDPA network card through the target host virtual switch.
Further, step S4 of the method for avoiding packet loss in vDPA virtual machine live migration of the present invention further includes:
sending a virtual machine starting completion notification to the source host virtualization management software through the target host virtualization management software;
disconnecting the SOCKET connection between the source host and the target host, and releasing the virtual machine by the source host;
and returning a notice of completing the thermal migration to the user side through the source host virtualization management software.
Further, in step S4 of the method for no packet loss in vDPA virtual machine live migration of the present invention, the releasing of virtual machine resources by the source host includes: and sending a notice for releasing virtual machine resources to the virtual machine of the source host through the virtualization management software of the source host, releasing the memory of the virtual machine, and releasing the vDPA network card of the source host through the virtual machine of the source host.
The method for avoiding packet loss in the vDPA virtual machine thermal migration can solve the problem of packet loss in the thermal migration period and ensure that no message is lost in the whole thermal migration period of the virtual machine.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a virtual machine migration method in the prior art.
Fig. 2 is a flowchart of a method for avoiding packet loss in vDPA virtual machine live migration according to an exemplary first embodiment of the present invention.
Fig. 3 is an execution flowchart of a method for avoiding packet loss in vDPA virtual machine live migration according to an exemplary first embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be noted that, in the case of no conflict, the features in the following embodiments and examples may be combined with each other; moreover, all other embodiments that can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort fall within the scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
Fig. 2 is a flowchart of a method for avoiding packet loss in vDPA virtual machine live migration according to an exemplary first embodiment of the present invention, and fig. 3 is a flowchart of an execution of the method for avoiding packet loss in vDPA virtual machine live migration according to the exemplary first embodiment of the present invention, as shown in fig. 2 and fig. 3, the method in this embodiment includes:
step S1: pushing the main dirty pages on the source host to the target host according to the hot migration request;
step S2: migrating the flow from the vDPA network card of the source host to a cache network card of the target host through the virtual switch of the source host, and starting to capture a cache message and store the cache message into the cache network card by the target host;
and step S3: pausing a virtual machine of a source host, and pushing all the residual dirty pages on the source host to a target host;
and step S4: and after pushing all dirty pages, starting the virtual machine of the target host, sending the cache message to the vDPA network card, and migrating the flow to the vDPA network card to complete virtual machine migration.
A second exemplary embodiment of the present invention provides a method for avoiding packet loss in vDPA virtual machine live migration, where this embodiment is a preferred embodiment of the methods shown in fig. 2 and fig. 3, and step S1 of the method for avoiding packet loss in vDPA virtual machine live migration in this embodiment includes:
the method comprises the steps that a user side sends a live migration request to source host virtualization management software according to the running state of a source host;
after receiving the live migration request, the source host virtualization management software establishes SOCKET connection with the target host virtualization management software;
creating a cache network card and starting a cache program by the target host virtualization management software;
the source host virtualization management software pushes dirty pages corresponding to source host virtual machines needing to be migrated to target host virtualization management software;
after one-time pushing is finished, continuously pushing dirty pages generated in the last pushing period;
and continuously repeating pushing, when the size of the pushed dirty page is smaller than a set value, judging that the pushing of the main dirty page is finished, and stopping the pushing of the dirty page.
A third exemplary embodiment of the present invention provides a method for avoiding packet loss in vDPA virtual machine live migration, where this embodiment is a preferred embodiment of the method shown in fig. 2 and fig. 3, and step S2 of the method for avoiding packet loss in vDPA virtual machine live migration in this embodiment includes: and the source host virtualization management software informs the source host virtual switch of migrating the flow to the cache network card, stops receiving and sending the flow between the source host virtual switch and the source host vDPA network card, migrates the flow to the target host virtual switch, and starts to continuously receive and send the flow between the target host virtual switch and the cache network card of the target host.
A fourth exemplary embodiment of the present invention provides a method for packet loss prevention during vDPA virtual machine live migration, where this embodiment is a preferred embodiment of the methods shown in fig. 2 and fig. 3, and step S3 of the method for packet loss prevention during vDPA virtual machine live migration according to this embodiment includes: and pausing the virtual machine of the source host, sending the dirty page before pausing of the virtual machine of the source host to the virtualization management software of the target host by adopting the virtualization management software of the source host, and informing the virtualization management software of the target host of completing the pushing of the dirty page by the virtualization management software of the source host.
An exemplary fifth embodiment of the present invention provides a method for avoiding packet loss in vDPA virtual machine live migration, which is a preferred embodiment of the method shown in fig. 2 and fig. 3.
Step S4 of the method for avoiding packet loss in vDPA virtual machine live migration in this embodiment includes:
after receiving the notice of completion of pushing the dirty pages, the target host virtualization management software starts a target host virtual machine and simultaneously starts a target host vDPA network card;
after the virtual machine of the target host is started, the target host virtualization management software informs the target host cache network card to send a cache message, and the target host cache network card sends the cache message to the target host vDPA network card;
and informing the target host virtual switch of migrating the flow to the target host vDPA network card through the target host virtualization management software, stopping the flow transceiving between the target host virtual switch and the cache network card, and migrating the flow in the target host cache network card to the target host vDPA network card through the target host virtual switch.
Step S4 of the method for not losing packets in vDPA virtual machine live migration in this embodiment further includes:
sending a notice of completion of virtual machine starting to the source host virtualization management software through the target host virtualization management software;
disconnecting the SOCKET connection between the source host and the target host, and releasing the virtual machine by the source host;
and returning a notice of completing the thermal migration to the user side through the source host virtualization management software.
In practical application, in step S4 of the method for packet loss prevention in vDPA virtual machine live migration according to this embodiment, releasing virtual machine resources by a source host includes: and sending a notice of releasing virtual machine resources to the virtual machine of the source host through the virtualization management software of the source host, releasing the memory of the virtual machine, and releasing the vDPA network card of the source host through the virtual machine of the source host.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A method for avoiding packet loss in vDPA virtual machine live migration is characterized by comprising the following steps:
step S1: pushing the main dirty pages on the source host to the target host according to the hot migration request;
step S2: migrating the flow from the vDPA network card of the source host to a cache network card of the target host through the virtual switch of the source host, and starting to capture a cache message and store the cache message into the cache network card by the target host;
and step S3: pausing a virtual machine of a source host, and pushing all the residual dirty pages on the source host to a target host;
and step S4: after pushing all dirty pages, starting the virtual machine of the target host, sending the cache message to the vDPA network card, migrating the flow to the vDPA network card, and completing virtual machine migration.
2. The method for avoiding packet loss in vDPA virtual machine live migration according to claim 1, wherein step S1 comprises:
the method comprises the steps that a user side sends a live migration request to source host virtualization management software according to the running state of a source host;
after receiving the live migration request, the source host virtualization management software establishes SOCKET connection with the target host virtualization management software;
creating a cache network card and starting a cache program by the virtualization management software of the target host;
the source host virtualization management software pushes dirty pages corresponding to source host virtual machines needing to be migrated to target host virtualization management software;
after one-time pushing is finished, continuously pushing dirty pages generated in the last pushing period;
and continuously repeating pushing, when the size of the pushed dirty pages is smaller than a set value, judging that the pushing of the main dirty pages is finished, and stopping the pushing of the dirty pages.
3. The method for avoiding packet loss in vDPA virtual machine live migration according to claim 1, wherein step S2 includes: and the source host virtualization management software informs the source host virtual switch of migrating the flow to the cache network card, stops receiving and sending the flow between the source host virtual switch and the source host vDPA network card, migrates the flow to the target host virtual switch, and starts to continuously receive and send the flow between the target host virtual switch and the cache network card of the target host.
4. The method for avoiding packet loss in vDPA virtual machine live migration according to claim 1, wherein step S3 comprises: and pausing the virtual machine of the source host, sending the dirty page before pausing of the virtual machine of the source host to the virtualization management software of the target host by adopting the virtualization management software of the source host, and informing the virtualization management software of the target host of completing the pushing of the dirty page by the virtualization management software of the source host.
5. The method for avoiding packet loss in vDPA virtual machine live migration according to claim 1, wherein step S4 includes:
after receiving the notice of completion of dirty page pushing, the target host virtualization management software starts a target host virtual machine and simultaneously starts a target host vDPA network card;
after the target host virtual machine is started, the target host virtual machine management software informs the target host cache network card to send a cache message, and the target host cache network card sends the cache message to the target host vDPA network card;
and informing the target host virtual switch of migrating the flow to the target host vDPA network card through the target host virtualization management software, stopping the flow transceiving between the target host virtual switch and the cache network card, and migrating the flow in the target host cache network card to the target host vDPA network card through the target host virtual switch.
6. The method for avoiding packet loss in vDPA virtual machine live migration according to claim 1, wherein step S4 further comprises: sending a virtual machine starting completion notification to the source host virtualization management software through the target host virtualization management software;
disconnecting the SOCKET connection between the source host and the target host, and releasing the virtual machine by the source host;
and returning a notice of completing the thermal migration to the user side through the source host virtualization management software.
7. The method according to claim 6, wherein releasing virtual machine resources by the source host in step S4 includes: and sending a notice for releasing virtual machine resources to the virtual machine of the source host through the virtualization management software of the source host, releasing the memory of the virtual machine, and releasing the vDPA network card of the source host through the virtual machine of the source host.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120110237A1 (en) * | 2009-12-01 | 2012-05-03 | Bin Li | Method, apparatus, and system for online migrating from physical machine to virtual machine |
| US20140208111A1 (en) * | 2013-01-22 | 2014-07-24 | Amazon Technologies, Inc. | Secure virtual machine migration |
| CN106250228A (en) * | 2016-08-11 | 2016-12-21 | 北京网迅科技有限公司杭州分公司 | The method and device that virtual machine entity thermophoresis networking takes over seamlessly |
| CN106911534A (en) * | 2017-02-28 | 2017-06-30 | 郑州云海信息技术有限公司 | A kind of live migration of virtual machine method and its system |
| CN107544841A (en) * | 2016-06-29 | 2018-01-05 | 中兴通讯股份有限公司 | Live migration of virtual machine method and system |
| CN107819708A (en) * | 2016-09-12 | 2018-03-20 | 阿里巴巴集团控股有限公司 | Data processing method, system and equipment based on virtual machine (vm) migration |
| CN109739618A (en) * | 2018-12-10 | 2019-05-10 | 新华三云计算技术有限公司 | Virtual machine migration method and device |
| CN110633127A (en) * | 2018-06-25 | 2019-12-31 | 华为技术有限公司 | Data processing method and related equipment |
| CN112148430A (en) * | 2020-09-28 | 2020-12-29 | 中电积至(海南)信息技术有限公司 | Method for online safe migration of virtual machine with virtual network function |
| CN112148421A (en) * | 2019-06-29 | 2020-12-29 | 华为技术有限公司 | Virtual machine migration method and device |
| US20210165675A1 (en) * | 2019-12-02 | 2021-06-03 | Xiao Wang | Live migration for hardware accelerated para-virtualized io device |
| CN114143252A (en) * | 2021-11-29 | 2022-03-04 | 中国电信集团系统集成有限责任公司 | Method for realizing uninterrupted multicast flow during virtual machine migration |
-
2022
- 2022-09-21 CN CN202211150314.0A patent/CN115499385B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120110237A1 (en) * | 2009-12-01 | 2012-05-03 | Bin Li | Method, apparatus, and system for online migrating from physical machine to virtual machine |
| US20140208111A1 (en) * | 2013-01-22 | 2014-07-24 | Amazon Technologies, Inc. | Secure virtual machine migration |
| CN107544841A (en) * | 2016-06-29 | 2018-01-05 | 中兴通讯股份有限公司 | Live migration of virtual machine method and system |
| CN106250228A (en) * | 2016-08-11 | 2016-12-21 | 北京网迅科技有限公司杭州分公司 | The method and device that virtual machine entity thermophoresis networking takes over seamlessly |
| CN107819708A (en) * | 2016-09-12 | 2018-03-20 | 阿里巴巴集团控股有限公司 | Data processing method, system and equipment based on virtual machine (vm) migration |
| CN106911534A (en) * | 2017-02-28 | 2017-06-30 | 郑州云海信息技术有限公司 | A kind of live migration of virtual machine method and its system |
| CN110633127A (en) * | 2018-06-25 | 2019-12-31 | 华为技术有限公司 | Data processing method and related equipment |
| CN109739618A (en) * | 2018-12-10 | 2019-05-10 | 新华三云计算技术有限公司 | Virtual machine migration method and device |
| CN112148421A (en) * | 2019-06-29 | 2020-12-29 | 华为技术有限公司 | Virtual machine migration method and device |
| US20210165675A1 (en) * | 2019-12-02 | 2021-06-03 | Xiao Wang | Live migration for hardware accelerated para-virtualized io device |
| CN112148430A (en) * | 2020-09-28 | 2020-12-29 | 中电积至(海南)信息技术有限公司 | Method for online safe migration of virtual machine with virtual network function |
| CN114143252A (en) * | 2021-11-29 | 2022-03-04 | 中国电信集团系统集成有限责任公司 | Method for realizing uninterrupted multicast flow during virtual machine migration |
Non-Patent Citations (1)
| Title |
|---|
| 曾少慧;邱彬;: "云计算中虚拟机脏页实时迁移的改进策略", 汕头大学学报(自然科学版), no. 02 * |
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