CN113949691A - ETCD-based virtual network address high-availability implementation method and system - Google Patents
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Abstract
The invention discloses a realization method and a system for high availability of a virtual network address based on ETCD (electronic toll collection). by accessing each service node in a cluster system into the same ETCD distributed database cluster, each service node acquires a distributed lock through competition, the service node which successfully acquires the distributed lock becomes a main node, a specific key with a lease is created and written into the main node information, the lease of the specific key is subject to periodic lease renewal to keep the state of the main node, and simultaneously VIP (very important person) is configured on a network card of the service node; the slave nodes monitor the specific keys created by the master nodes based on the Watch mechanism of the ETCD, when the master nodes fail to cause the specific keys to fail, the ETCD informs the slave nodes, new master node election is triggered, master node switching is completed, and therefore VIP high availability is achieved.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a virtual network address high-availability implementation method and system based on ETCD.
Background
A virtual network address (VIP), which is an IP address not bound to a specific computer or a specific network card of a specific computer, can be dynamically mapped to different computers or computer network cards in an internal network, and is generally used to implement redundancy of connections, i.e., high availability.
At present, the realization of the high availability of the VIP is mostly realized by using traditional cluster service software such as keepalive or placemaker, however, the software is more biased to heavy application, depends more, is more applied to high-availability scenes of system services, and is more complex to use and maintain.
The ETCD is a high-availability and strong-consistency distributed key value database, adopts a Raft consistency algorithm, is mainly used for reliable and fast persistent storage and access of key data, can realize reliable distributed cooperation through mechanisms such as a distributed lock and a Watch, and has the characteristics of high availability, light weight, easy deployment and use and quick response. However, in the prior art, no research is related to the realization of high availability of virtual network addresses based on the ETCD.
In view of the above, it is necessary to introduce a new implementation method and system for realizing high availability of virtual network addresses based on the ETCD to solve the above technical problems.
Disclosure of Invention
The invention mainly aims to provide a method and a system for realizing high availability of a virtual network address based on ETCD (electronic toll collection), which reduce the possibility of simultaneous failure and ensure the high availability of the virtual network address on the premise of not sharing the same set of cluster service software.
In order to achieve the above object, the present invention provides a method for implementing high availability of a virtual network address based on an etc, including:
step S0, configuring each service node to access to the same ETCD distributed database cluster;
step S1, each service node competes for acquiring the distributed lock in a concurrent competition mode, the service node acquiring the distributed lock is used as a master node of a virtual network address, and the rest service nodes not acquiring the distributed lock are used as slave nodes;
step S2, the main node creates a key with a lease in the ETCD distributed database cluster, writes the actual IP address of the main node and the host information into the key with the lease, and then configures the VIP to the main node network card;
step S3, the main node renews the lease-bearing key periodically;
step S4, the slave node monitors whether the master node fails or not based on the Watch mechanism of the ETCD;
and step S5, when the master node fails due to the fault of the master node, the ETCD informs each slave node, and returns to the step S1 to determine a new master node.
Further, step S31 is included, where each slave node acquires the key with the lease by listening to acquire the information of the master node and complete the election of the master node.
Further, the step S4 includes: and the slave node monitors the key with the lease based on a Watch mechanism of the ETCD and judges whether the master node fails.
Further, the step of monitoring the lease key by the slave node based on the fetch mechanism of the ETCD and judging whether the master node fails includes: when the main node fails, the main node cannot periodically renew the lease-carrying key, the lease-carrying key expires and is expired, the ETCD informs all slave nodes monitoring the lease-carrying key, and the slave nodes receive the expiration notice so as to judge that the main node is in an expiration state.
Further, the step S1 includes:
each service node competes for acquiring the distributed lock in a concurrent competition mode;
judging whether the current service node obtains a distributed lock;
if yes, taking the service node which obtains the distributed lock as a main node of the VIP, and entering the step S2;
if not, the current serving node is determined to be the slave node, and the process proceeds to step S4.
Further, the step S5 further includes: the ETCD distributed database cluster sends the notification of the lease-on-key failure to the slave nodes.
The invention also discloses an ETCD-based high-availability implementation system for the virtual network address, which comprises all service nodes accessed into the same ETCD distributed database cluster; wherein, the realization system comprises:
the master node election module is used for obtaining the distributed lock by each service node through competition in a concurrent competition mode, using the service node obtaining the distributed lock as a master node of a virtual network address, and using the rest service nodes not obtaining the distributed lock as slave nodes; the system comprises a main node, an ETCD distributed database cluster, a network card and a virtual IP address, wherein the main node is used for controlling the main node to create a key with a lease in the ETCD distributed database cluster, writing the actual IP address of the main node and host information into the key with the lease and configuring VIP to the network card of the main node; and the system is used for controlling the main node to periodically renew the lease-carrying key so as to keep the online state of the main node;
the monitoring module is used for controlling the slave node to monitor whether the master node fails or not based on a Watch mechanism of the ETCD;
and the master node switching module is used for informing the master node election module to determine a new master node when the master node fails.
Further, the master node election module is further configured to control each slave node to acquire the lease key in a monitoring manner, so as to acquire information of the master node and complete election of the master node.
Furthermore, the monitoring module is further configured to control the slave node to monitor the lease-carrying key based on a fetch mechanism of the ETCD, and determine whether the master node fails.
The technical scheme of the invention realizes the high availability of the VIP based on the distributed lock and the Watch mechanism of the ETCD. Each service node in the cluster system is accessed into the same ETCD distributed database cluster, the distributed locks are acquired through competition among the service nodes, the service nodes which successfully acquire the distributed locks become main nodes, special keys with leases are created and written into the main node information, the leases of the special keys are periodically renewed to keep the state of the main nodes, and meanwhile, VIP is configured on a network card of the service node; the slave nodes monitor the specific keys created by the master nodes based on the Watch mechanism, when the master nodes fail to cause the specific keys to fail, the ETCD informs the nodes, new master node election is triggered, master node switching is completed, and therefore VIP high availability is achieved. The VIP height can be realized based on ETCD, compared with the traditional cluster service software, the method has the characteristics of light weight, simplicity in deployment, operation and maintenance and rapidness in response, and meanwhile, the VIP height can be separated from the service height, the same set of cluster service software is not shared, and the possibility of simultaneous failures is reduced.
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Fig. 1 is a flowchart of a method for implementing high availability of virtual network addresses based on an etc in an embodiment of the present invention;
fig. 2 is a schematic network structure diagram of an implementation system with high availability of virtual network addresses based on an ETCD according to an embodiment of the present invention;
the objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
Referring to fig. 1-2, in order to achieve the above object, an embodiment of the invention provides a method and a system for implementing high availability of virtual network addresses based on an ETCD.
The ETCD-based implementation method for high availability of the virtual network address comprises the following steps:
and step S0, configuring each service node to access the same ETCD distributed database cluster. Specifically, the ETCD uses a Raft algorithm to keep strong consistency of data, the stored data are necessarily consistent globally, and the distributed lock based on the realization can be suitable for master node election, specifically refer to steps S1-S3.
Step S1, the service nodes compete to acquire the distributed lock in a concurrent competition manner, the service node that acquires the distributed lock is used as a master node of the VIP, and the rest of the service nodes that do not acquire the distributed lock are used as slave nodes of the VIP.
Step S2, the master node creates a lease-equipped key in the ETCD distributed database cluster, writes the actual IP address of the master node and the host information into the lease-equipped key, and then configures the VIP to the master node network card.
Step S3, the lease-equipped key is renewed periodically by the master node.
Specifically, the step S1 specifically includes:
each service node competes for acquiring the distributed lock in a concurrent competition mode;
judging whether the current service node obtains a distributed lock;
if yes, the service node which obtains the distributed lock is taken as a main node of a virtual network address, and the step S2 is carried out;
if not, the current serving node is determined to be the slave node, and the process proceeds to step S4.
The step S3 is followed by: further, step S31 is included, where each slave node acquires the key with the lease by listening to acquire the information of the master node and complete the election of the master node.
And step S4, the slave node monitors whether the master node fails or not based on the watch mechanism of the ETCD distributed database cluster.
Specifically, the step S4 includes: and monitoring the key with the lease based on the fetch mechanism of the ETCD, and judging whether the main node fails.
Preferably, in a preferred embodiment, the step of determining whether the master node fails according to the information of the master node includes: and acquiring the key with the lease according to the information of the main node, and judging whether the key with the lease is invalid or not so as to determine that the main node is invalid.
Specifically, when the master node fails, the lease key/lock/vip is deleted due to expiration failure; the step of acquiring the lease key according to the information of the master node, judging whether the lease key fails or not to determine the failure of the master node, and the step of monitoring the lease key by the slave node based on a fetch mechanism of the ETCD to judge whether the master node fails or not includes: when the main node fails, the main node cannot periodically renew the lease-carrying key, the lease-carrying key expires and is invalid, the ETCD knows all slave nodes monitoring the lease-carrying key, and the slave nodes receive an invalid notification to judge that the main node is in an invalid state.
And step S5, when the master node fails due to the fault of the master node, the ETCD informs each slave node, and returns to the step S1 to determine a new master node.
Further, the step S5 further includes: and the ETCD distributed database cluster sends the notification of the failure of the main node to each service node.
The invention also discloses an ETCD-based high-availability implementation system for the virtual network address, which comprises all service nodes accessed into the same ETCD distributed database cluster; wherein, the realization system comprises: the system comprises a main node election module, a monitoring module and a main node switching module.
The master node election module is used for obtaining the distributed lock by each service node through competition in a concurrent competition mode, using the service node obtaining the distributed lock as a master node of a virtual network address, and using the rest service nodes not obtaining the distributed lock as slave nodes; the system comprises a main node, an ETCD distributed database cluster, a network card and a virtual IP address, wherein the main node is used for controlling the main node to create a key with a lease in the ETCD distributed database cluster, writing the actual IP address of the main node and host information into the key with the lease and configuring VIP to the network card of the main node; and the system is used for controlling the main node to periodically renew the lease-carrying key and keeping the online state of the main node. Specifically, ETCD uses the Raft algorithm to keep the strong consistency of data, the stored data are necessarily consistent globally, and the distributed lock based on the realization can be suitable for the election of the main node.
Further, specifically, the master node election module is further configured to:
each service node competes for acquiring the distributed lock in a concurrent competition mode;
judging whether the current service node obtains a distributed lock;
if yes, taking the service node of the distributed lock as a main node of a virtual network address, and continuing to perform the election configuration step;
if not, the current service node is determined as the slave node, and the monitoring step is carried out.
The master node election module is further configured to control each slave node to acquire the key with the lease in a monitoring manner, so as to acquire information of the master node and complete election of the master node.
The monitoring module is used for controlling the slave node to monitor whether the master node fails or not based on a fetch mechanism of the ETCD.
And the master node switching module is used for informing the master node election module to determine a new master node when the master node fails. Further, the master node switching module is further configured to control the ETCD distributed database cluster to send the notification that the master node is invalid to each slave node.
Preferably, in a preferred embodiment, the monitoring, by the slave node, whether the master node fails based on the fetch mechanism of the ETCD includes: and the slave node monitors the key with the lease based on a Watch mechanism of the ETCD and judges whether the master node fails.
Further, the master node election module is further configured to control each slave node to acquire the lease key in a monitoring manner, so as to acquire information of the master node and complete election of the master node.
The technical scheme of the invention realizes the high availability of the VIP based on the distributed lock and the Watch mechanism of the ETCD. Each service node in the cluster system is accessed into the same ETCD distributed database cluster, the distributed locks are acquired through competition among the service nodes, the service nodes which successfully acquire the distributed locks become main nodes, special keys with leases are created and written into the main node information, the leases of the special keys are periodically renewed to keep the state of the main nodes, and meanwhile, VIP is configured on a network card of the service node; the slave nodes monitor the specific keys created by the master nodes based on the Watch mechanism, when the master nodes fail to cause the specific keys to fail, the ETCD informs the nodes, new master node election is triggered, master node switching is completed, and therefore VIP high availability is achieved. The VIP height can be realized based on ETCD, compared with the traditional cluster service software, the method has the characteristics of light weight, simplicity in deployment, operation and maintenance and rapidness in response, and meanwhile, the VIP height can be separated from the service height, the same set of cluster service software is not shared, and the possibility of simultaneous failures is reduced.
In the description herein, references to the description of the term "one embodiment," "another embodiment," or "first through xth embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, method steps, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A realization method for high availability of virtual network addresses based on ETCD is characterized by comprising the following steps:
step S0, configuring each service node to access to the same ETCD distributed database cluster;
step S1, each service node competes for acquiring the distributed lock in a concurrent competition mode, the service node acquiring the distributed lock is used as a master node of a virtual network address, and the rest service nodes not acquiring the distributed lock are used as slave nodes;
step S2, the main node creates a key with a lease in the ETCD distributed database cluster, writes the actual IP address of the main node and the host information into the key with the lease, and then configures the virtual network address to the main node network card;
step S3, the main node renews the lease-bearing key periodically;
step S4, the slave node monitors whether the master node fails or not based on the Watch mechanism of the ETCD;
and step S5, when the master node fails due to the fault of the master node, the ETCD informs each slave node, and returns to the step S1 to determine a new master node.
2. The method according to claim 1, further comprising step S31, wherein the slave node obtains the lease key by listening to obtain the information of the master node and complete the election of the master node.
3. The method according to claim 1, wherein the step S4 includes: and the slave node monitors the key with the lease based on a Watch mechanism of the ETCD and judges whether the master node fails.
4. The method according to claim 3, wherein the step of the slave node monitoring the lease key based on the fetch mechanism of the ETCD and determining whether the master node fails comprises: when the main node fails, the main node cannot periodically renew the lease-carrying key, the lease-carrying key expires and is expired, the ETCD informs all slave nodes monitoring the lease-carrying key, and the slave nodes receive the expiration notice so as to judge that the main node is in an expiration state.
5. The method according to claim 1, wherein the step S1 includes:
each service node competes for acquiring the distributed lock in a concurrent competition mode;
judging whether the current service node obtains a distributed lock;
if yes, the service node which obtains the distributed lock is taken as a main node of a virtual network address, and the step S2 is carried out;
if not, the current serving node is determined to be the slave node, and the process proceeds to step S4.
6. The method according to any of claims 1-5, wherein the step S5 further comprises: the ETCD distributed database cluster sends the notification of the lease-on-key failure to the slave nodes.
7. A high-availability realization system of virtual network addresses based on ETCD is characterized by comprising service nodes accessed in the same ETCD distributed database cluster; wherein, the realization system comprises:
the master node election module is used for obtaining the distributed lock by each service node through competition in a concurrent competition mode, using the service node obtaining the distributed lock as a master node of a virtual network address, and using the rest service nodes not obtaining the distributed lock as slave nodes; the system comprises a main node, an ETCD distributed database cluster, a virtual network address and a network card, wherein the main node is used for controlling the main node to create a key with a lease in the ETCD distributed database cluster, writing an actual IP address and host information of the main node into the key with the lease and configuring the virtual network address onto the network card of the main node; and the system is used for controlling the main node to periodically renew the lease-carrying key so as to keep the online state of the main node;
the monitoring module is used for controlling the slave node to monitor whether the master node fails or not based on a Watch mechanism of the ETCD;
and the master node switching module is used for informing the master node election module to determine a new master node when the master node fails.
8. The system according to claim 7, wherein the master node election module is further configured to control each slave node to obtain the lease key by listening to obtain information about the master node and complete the master node election.
9. The system according to claim 7, wherein the monitoring module is further configured to control the slave node to monitor the lease key based on a Watch mechanism of the ETCD to determine whether the master node fails.
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