CN115499485A - Switching method of server and network equipment - Google Patents

Switching method of server and network equipment Download PDF

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Publication number
CN115499485A
CN115499485A CN202211049137.7A CN202211049137A CN115499485A CN 115499485 A CN115499485 A CN 115499485A CN 202211049137 A CN202211049137 A CN 202211049137A CN 115499485 A CN115499485 A CN 115499485A
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China
Prior art keywords
terminal
server
notification
session
address
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CN202211049137.7A
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Chinese (zh)
Inventor
郑上闽
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New H3C Technologies Co Ltd
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New H3C Technologies Co Ltd
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Priority to CN202211049137.7A priority Critical patent/CN115499485A/en
Publication of CN115499485A publication Critical patent/CN115499485A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/148—Migration or transfer of sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/146—Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer And Data Communications (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The present specification provides a method for switching a server and a network device, where the method includes: the method comprises the steps of obtaining a first notification which is sent by an address analysis device and is inaccessible from a first terminal to a first server, inquiring stored session information according to address information of the first terminal after obtaining the first notification, judging whether the session information corresponding to the first terminal exists or not, and sending a second notification to the first terminal if the session information corresponding to the first terminal exists, wherein the second notification is used for enabling the first terminal and the second server to establish a session. By the method, the time for the terminal to switch the server can be effectively shortened, and the phenomenon that the terminal needs to switch the server after probing for a long time, so that the switching time is too long and the user experience is influenced is avoided.

Description

Switching method of server and network equipment
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method for switching a server and a network device.
Background
In order to realize high availability of the application, the application server may adopt active/standby dual nodes or even multi-node deployment. Multiple nodes issue the same URL (Uniform Resource Locator) externally. When an application initiates access through the application, firstly, the application uses a name resolution device (which can be a DNS server or an application gateway) to resolve the URL of the application into a node address actually providing service, and a TCP connection is established between the node address and a service node for access.
Disclosure of Invention
The embodiment of the disclosure provides a server switching method and network equipment, by which the time for a terminal to switch a server can be effectively shortened, and the problem that the switching time is too long and user experience is influenced because the terminal needs to perform long-time trial and then performs server switching is avoided.
The disclosed embodiment provides a switching method of a server, which is applied to network equipment, wherein the network equipment is arranged between a terminal and the server, and is communicated with an address resolution device, and the method comprises the following steps:
acquiring a first notification which is sent by an address resolution device and is inaccessible from a first terminal to a first server;
after the first notification is acquired, inquiring the stored session information according to the address information of the first terminal, and judging whether the session information corresponding to the first terminal exists or not;
if so, sending a second notification to the first terminal, wherein the second notification is used for enabling the first terminal and a second server to establish a session;
the first server and the second server correspond to the same uniform resource locator URL.
The method further comprises the following steps: the network equipment acquires network attribute information of each terminal;
maintaining session information of each terminal and a corresponding server according to the network attribute information of each terminal;
wherein the network attribute information at least includes address information of the terminal.
The acquiring a first notification that the first terminal is unreachable to the first server, which is sent by the address resolution device, includes:
acquiring a first notification from an address resolution device in a message subscription or registration managed mode;
alternatively, the first notification is acquired from the address resolution device according to the state of each session information by periodically querying the state of the server related to the session information.
Wherein, the sending a second notification to the first terminal, where the second notification is used to enable the first terminal to establish a session with a second server, includes:
sending a second notification to the first terminal;
so that the first terminal closes the session with the first service terminal according to the second notification;
and when the first terminal needs to access the server, establishing a session between the first terminal and the second server according to the URL.
It can be seen from the foregoing embodiments that the network device can actively notify the server to which the terminal is being connected that a fault occurs, so that the terminal can quickly interrupt a problematic session and establish a new service session, thereby effectively shortening the time for the terminal to switch the server, and avoiding the problem of too long switching time caused by switching the server after the terminal needs to perform a long-time probing.
The embodiment of the present disclosure further provides a method for switching a server, where the method is applied to an address resolution device, the address resolution device is connected to a network device, the network device is disposed between a terminal and the server, and the method includes:
the address resolution device monitors the address state of a first service end;
when monitoring that the corresponding server health detection fails, or when the server actively logs off the address, or when the configuration of the server changes, sending a first notification to the network equipment;
after the network equipment acquires the first notification, inquiring the stored session information according to the address information of the first terminal, and judging whether the session information corresponding to the first terminal exists or not;
if so, sending a second notification to the first terminal, wherein the second notification is used for enabling the first terminal and a second server to establish a session;
the first terminal is a terminal which has a session with a first service terminal;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
It can be seen from the above embodiments that, in order to implement the present solution, the address resolution device may actively detect whether a fault (configuration change) exists at the server, and if the fault exists, the address resolution device may notify the network device in time, so that the network device notifies the corresponding terminal to close the session, thereby effectively shortening the time for the terminal to switch the server, and avoiding the problem that the terminal needs to perform a long-time trial and then perform a server switching, which may result in an excessively long switching time.
The embodiment of the present disclosure further provides a network device, where the network device is disposed between a terminal and a server, and the network device is in communication with the address resolution apparatus, and the network device includes:
the acquisition module is used for acquiring a first notification which is sent by the address resolution device and is inaccessible from the first terminal to the first server;
the judging module is used for inquiring the stored session information according to the address information of the first terminal after the first notice is obtained, and judging whether the session information corresponding to the first terminal exists or not;
a sending module, configured to send a second notification to the first terminal, where the second notification is used to enable the first terminal to establish a session with a second server;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
The acquisition module is further used for acquiring network attribute information of each terminal;
maintaining session information of each terminal and a corresponding server according to the network attribute information of each terminal;
wherein the network attribute information at least includes address information of the terminal.
The sending module is specifically configured to send a second notification to the first terminal;
enabling the first terminal to close the session with the first service terminal according to the second notification;
and when the first terminal needs to access the server, the first terminal and the second server establish a session according to the URL.
The embodiment of the present disclosure further provides an address resolution apparatus, where the address resolution apparatus is connected to a network device, the network device is disposed between a terminal and a server, and the address resolution apparatus includes:
the monitoring module is used for monitoring the address state of the first service terminal;
a sending module, configured to send a first notification to a network device when it is monitored that health detection of a corresponding server fails, or when the server actively logs off an address, or when configuration of the server changes, so that the network device queries stored session information according to address information of a first terminal after acquiring the first notification, and determines whether session information corresponding to the first terminal exists, and if so, sends a second notification to the first terminal, where the second notification is used to enable the first terminal and a second server to establish a session;
the first terminal is a terminal which has a session with a first service terminal;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present specification and together with the description, serve to explain the principles of the specification.
Fig. 1 is a schematic diagram of a network architecture according to an embodiment of the present disclosure.
Fig. 2 is a schematic architecture diagram of a switching method of a server according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with this description. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the specification, as detailed in the claims that follow.
The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the description. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present description. The word "if" as used herein may be interpreted as "at" \8230; "or" when 8230; \8230; "or" in response to a determination ", depending on the context.
As shown in fig. 1, it is assumed that the nodes providing services include App Server a and App Server B, and the issued URL is App. The access flow is as follows:
app Server A and App Server B register the corresponding relation between the URL and the IP addresses of the two nodes to the address resolution device respectively. The address analysis device uses respective addresses to periodically detect the states of the two nodes;
the Client accesses the app.example, and first requests the address of the app.example from the address resolution device. The address analysis device returns the address of the App Server A to the Client according to the configuration or the strategy;
and the Client establishes connection with the App Server A by using the address of the App Server A to access.
When App Server A fails, the Client sends a message to App Server A without response. The Client will retransmit after a timeout. The retransmission still cannot be responded, and the connection is not reestablished according to the above steps until the maximum retransmission times is exceeded. Only at this time is the address acquired from the address resolution device made the address of App Server B. This retransmission process may take up to several minutes or even tens of minutes. Meaning that the service failover times are as long as several minutes or even tens of minutes.
According to the embodiment, when a server serving a terminal fails, the terminal needs to be reconnected after long-time detection, so that a user cannot obtain service for a long time, and customer experience is affected.
In order to solve the above problem, as shown in fig. 2, an embodiment of the present disclosure provides a method for switching a server, where the method is applied to a network device, the network device is disposed between a terminal and the server, and the network device communicates with an address resolution device, and the method includes:
s201, acquiring a first notification which is sent by an address resolution device and is inaccessible from a first terminal to a first server;
after the first notification is obtained, the S202 queries the stored session information according to the address information of the first terminal, and determines whether the session information corresponding to the first terminal exists;
if the first terminal and the second terminal are in the session, S203 sends a second notification to the first terminal, wherein the second notification is used for enabling the first terminal and a second server to establish the session;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
In this embodiment, the address resolution device may be deployed in a DNS server, or may be deployed in a gateway device, where the network device may be a switch, a router, or a server.
In practical applications, the terminal may resolve an address corresponding to the URL, such as App Server a in fig. 1, to an address resolution device.
And the terminal establishes a session link with the Server according to the address (such as an App Server A address) of the Server acquired from the address resolution device.
In this embodiment, to implement the solution in this embodiment, session information between each terminal and the corresponding server may be maintained in the network device (in other embodiments, the session information may be maintained in a device capable of communicating with the network device).
For example, the network device may send a TCP control packet (SYN, SYN-ACK, FIN, RST, etc.) passing through the Client (terminal) to the network device CPU. The network device maintains session information according to the messages, wherein the information can comprise five-tuple of the session, interface for receiving the message, VRF and other information.
In this embodiment, the address resolution apparatus may monitor the status of each server address, which is exemplified by the first server, and the address resolution apparatus monitors the status of the first server address, and sends a first notification to the network device when it is monitored that the corresponding server health detection fails, or when the server actively logs off the address, or when the server configuration changes, where the first notification may carry address information of the server with a failure.
Specifically, in this embodiment, the address resolution device generates the address unavailable message according to the address status of the server. There are several ways in which this message can be generated:
a, regularly carrying out health detection on a Server by an address analysis device when the health detection fails;
b, when the address analysis device is an application gateway, the Server end actively logs out the address;
c, when the address resolution device is a DNS server, the configuration is changed.
When the address resolution device monitors that the server side has any one of the situations, the server side is determined to be unavailable.
In this embodiment, the network device may obtain the server address unavailability information from the address resolution apparatus in the following manner.
a, the network device acquires the unavailable message of the server side in the address resolution device by means of message subscription or registered managed mode.
b, regularly inquiring address states corresponding to the server related to the stored session information, judging whether the server address is unavailable or not, and if the server address is unavailable, acquiring the unavailable message of the server.
After receiving the first notification, the network device may obtain address information of the failed server from the first notification, and traverse whether there is matching target address information in the session information, if so, send a second notification to the first terminal corresponding to the target address information, so that the first terminal closes the session with the first server according to the second notification, and when the first terminal needs to access the server, establish the session with the second server according to the URL.
Specifically, after acquiring information that a certain server address is unavailable according to the first notification, the network device queries the stored session information according to the address information. And if the corresponding session information exists, sending a TCP RST message to the terminal address and the terminal port number of the session. And deleting the session table entry stored locally.
And after receiving the RST message, the terminal closes the corresponding session. When the Server information needs to be accessed again next time, the IP address is resolved again according to the URL (as shown in fig. 1, the address is returned to the available App Server B address), and a connection is established with the address, and subsequent interaction is performed. Therefore, the terminal does not need to wait for retransmission timeout and then uses a new address to establish connection, thereby reducing the service interruption time from minute level to second level.
It can be seen from the foregoing embodiments that the network device can actively notify the server to which the terminal is being connected that a fault occurs, so that the terminal can quickly interrupt a problematic session and establish a new service session, thereby effectively shortening the time for the terminal to switch the server, and avoiding the problem of too long switching time caused by switching the server after the terminal needs to perform a long-time probing.
Based on the foregoing embodiments, an embodiment of the present disclosure further provides a server switching method, where the method is applied to an address resolution device, the address resolution device is connected to a network device, and the network device is disposed between a terminal and a server, and the method includes:
the address resolution device monitors the address state of a first service end;
when monitoring that the corresponding server health detection fails, or when the server actively logs off the address, or when the server configuration changes, sending a first notification to a network device, so that the network device inquires stored session information according to the address information of a first terminal after acquiring the first notification, and judges whether session information corresponding to the first terminal exists, if so, sending a second notification to the first terminal, wherein the second notification is used for establishing a session between the first terminal and a second server;
the first terminal is a terminal which has a session with a first service terminal;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
The embodiment of the present disclosure further provides a network device, where the network device is disposed between a terminal and a server, and the network device is in communication with the address resolution apparatus, and the network device includes:
the acquisition module is used for acquiring a first notification which is sent by the address resolution device and is inaccessible from the first terminal to the first server;
the judging module is used for inquiring the stored session information according to the address information of the first terminal after the first notice is obtained, and judging whether the session information corresponding to the first terminal exists or not;
a sending module, configured to send a second notification to the first terminal, where the second notification is used to enable the first terminal to establish a session with a second server;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
The acquisition module is further used for acquiring network attribute information of each terminal;
maintaining session information of each terminal and a corresponding server according to the network attribute information of each terminal;
wherein the network attribute information at least includes address information of the terminal.
The sending module is specifically configured to send a second notification to the first terminal;
so that the first terminal closes the session with the first service terminal according to the second notification;
and when the first terminal needs to access the server, the first terminal and the second server establish a session according to the URL.
The embodiment of the present disclosure further provides an address resolution apparatus, where the address resolution apparatus is connected to a network device, the network device is disposed between a terminal and a server, and the address resolution apparatus includes:
the monitoring module is used for monitoring the address state of the first service terminal;
the system comprises a sending module, a receiving module and a sending module, wherein the sending module is used for sending a first notice to network equipment when monitoring that the corresponding server health detection fails, or when the server initiatively logs off an address, or when the server configuration changes, so that the network equipment inquires saved session information according to the address information of a first terminal after acquiring the first notice, judges whether session information corresponding to the first terminal exists, and sends a second notice to the first terminal if the session information corresponding to the first terminal exists, wherein the second notice is used for establishing a session between the first terminal and a second server;
the first terminal is a terminal which has a session with a first service terminal;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Other embodiments of the present description will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This specification is intended to cover any variations, uses, or adaptations of the specification following, in general, the principles of the specification and including such departures from the present disclosure as come within known or customary practice within the art to which the specification pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the specification being indicated by the following claims.
It will be understood that the present description is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.
The above description is only a preferred embodiment of the present disclosure, and should not be taken as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims (9)

1. A method for switching a server is applied to a network device, the network device is arranged between a terminal and the server, and the network device is communicated with an address resolution device, and the method comprises the following steps:
acquiring a first notification which is sent by an address resolution device and is inaccessible from a first terminal to a first server;
after the first notification is acquired, inquiring the stored session information according to the address information of the first terminal, and judging whether the session information corresponding to the first terminal exists or not;
if so, sending a second notification to the first terminal, wherein the second notification is used for enabling the first terminal and a second server to establish a session;
the first server and the second server correspond to the same uniform resource locator URL.
2. The method of claim 1, further comprising:
the network equipment acquires network attribute information of each terminal;
maintaining session information of each terminal and a corresponding server according to the network attribute information of each terminal;
wherein the network attribute information at least includes address information of the terminal.
3. The method of claim 1, wherein obtaining the first notification that the first terminal is unreachable to the first server from the address resolution apparatus comprises:
acquiring a first notification from an address resolution device in a message subscription or registration managed mode;
alternatively, the first notification is acquired from the address resolution device according to the state of each session information by periodically inquiring the state of the server related to the session information.
4. The method of claim 1, wherein sending a second notification to the first terminal, the second notification being used for the first terminal to establish a session with a second server, comprises:
sending a second notification to the first terminal;
so that the first terminal closes the session with the first service terminal according to the second notification;
and when the first terminal needs to access the server, establishing a session between the first terminal and the second server according to the URL.
5. A switching method of a server is characterized in that the method is applied to an address resolution device, the address resolution device is connected with a network device, the network device is arranged between a terminal and the server, and the method comprises the following steps:
the address resolution device monitors the address state of a first service end;
when monitoring that the corresponding server health detection fails, or when the server actively logs off the address, or when the server configuration changes, sending a first notification to a network device, so that the network device inquires stored session information according to the address information of a first terminal after acquiring the first notification, and judges whether session information corresponding to the first terminal exists, if so, sending a second notification to the first terminal, wherein the second notification is used for establishing a session between the first terminal and a second server;
the first terminal is a terminal which has a session with a first service terminal;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
6. A network device disposed between a terminal and a server, the network device communicating with an address resolution apparatus, the network device comprising:
the acquisition module is used for acquiring a first notification which is sent by the address resolution device and is inaccessible from the first terminal to the first server;
the judging module is used for inquiring the stored session information according to the address information of the first terminal after the first notice is obtained, and judging whether the session information corresponding to the first terminal exists or not;
a sending module, configured to send a second notification to the first terminal, where the second notification is used to enable the first terminal to establish a session with a second server;
and the first server corresponds to the same Uniform Resource Locator (URL) as the second server.
7. The network device of claim 6,
the acquisition module is also used for acquiring the network attribute information of each terminal;
maintaining session information of each terminal and a corresponding server according to the network attribute information of each terminal;
wherein the network attribute information at least includes address information of the terminal.
8. The network device of claim 6,
the sending module is specifically configured to send a second notification to the first terminal;
enabling the first terminal to close the session with the first service terminal according to the second notification;
and when the first terminal needs to access the server, the first terminal and the second server establish a session according to the URL.
9. An address resolution device, wherein the address resolution device is connected to a network device, the network device is disposed between a terminal and a server, and the address resolution device comprises:
the monitoring module is used for monitoring the address state of the first service end;
the system comprises a sending module, a receiving module and a sending module, wherein the sending module is used for sending a first notice to network equipment when monitoring that the corresponding server health detection fails, or when the server initiatively logs off an address, or when the server configuration changes, so that the network equipment inquires saved session information according to the address information of a first terminal after acquiring the first notice, judges whether session information corresponding to the first terminal exists, and sends a second notice to the first terminal if the session information corresponding to the first terminal exists, wherein the second notice is used for establishing a session between the first terminal and a second server;
the first terminal is a terminal which has a session with a first service terminal;
the first server and the second server correspond to the same uniform resource locator URL.
CN202211049137.7A 2022-08-30 2022-08-30 Switching method of server and network equipment Pending CN115499485A (en)

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