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下文主要给大家带来使用InnoDB Cluster解决MySQL数据库高可用方案，希望这些内容能够带给大家实际用处，这也是我编辑使用InnoDB Cluster解决MySQL数据库高可用方案这篇文章的主要目的。好了，废话不多说，大家直接看下文吧。
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MySQL InnoDB Cluster为MySQL提供了一个完整的高可用解决方案。MySQL Shell包含AdminAPI，能够轻松地配置和管理至少三个MySQL云服务器实例组，以作为InnoDB集群。每个MySQL云服务器实例都运行MySQL Group Replication，它提供了在innodb集群中复制数据的机制，并内置故障转移。MySQL Router可以根据您部署的集群自动配置自己，将客户端应用程序透明地连接到云服务器实例。如果云服务器实例发生意外故障，群集将自动重新配置。在默认的单主模式下，InnoDB集群有一个读写云服务器实例——主云服务器。多个辅助云服务器实例是主云服务器的副本。如果主云服务器出现故障，辅助云服务器将自动提升为主云服务器的角色。MySQL Router检测到这一点，并将客户端应用程序转发到新的主云服务器。
[root@wallet01 ~]# mysql -uroot -p
Enter password:
mysql> grant all privileges on *.* to 'root'@'wallet01' identified by 'abcd@1234';
Query OK, 0 rows affected, 1 warning (0.05 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.06 sec)
[root@wallet01 ~]# yum install -y mysql-shell
[root@wallet01 ~]# mysqlsh --log-level=DEBUG3
MySQL Shell 8.0.18
Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
Other names may be trademarks of their respective owners.
Type '\help' or '\?' for help; '\quit' to exit.
MySQL JS > shell.connect('root@wallet01:3306')
Creating a session to 'root@wallet01:3306'
Please provide the password for 'root@wallet01:3306': *********
Save password for 'root@wallet01:3306'? [Y]es/[N]o/Ne[v]er (default No): y
Fetching schema names for autocompletion... Press ^C to stop.
Your MySQL connection id is 290
Server version: 5.7.27-log MySQL Community Server (GPL)
No default schema selected; type \use to set one.
MySQL wallet01:3306 JS > var cluster = dba.createCluster('walletCluster', {adoptFromGR: true})
A new InnoDB cluster will be created based on the existing replication group on instance
'wallet01:3306'.
Creating InnoDB cluster 'walletCluster' on 'wallet01:3306'...
Adding Seed Instance...
Adding Instance 'wallet03:3306'...
Adding Instance 'wallet01:3306'...
Adding Instance 'wallet02:3306'...
Resetting distributed recovery credentials across the cluster...
Cluster successfully created based on existing replication group.
MySQL wallet01:3306 JS > cluster.status();
{
"clusterName": "walletCluster",
"defaultReplicaSet": {
"name": "default",
"primary": "wallet01:3306",
"ssl": "DISABLED",
"status": "OK",
"statusText": "Cluster is ONLINE and can tolerate up to ONE failure.",
"topology": {
"wallet01:3306": {
"address": "wallet01:3306",
"mode": "R/W",
"readReplicas": {},
"role": "HA",
"status": "ONLINE"
},
"wallet02:3306": {
"address": "wallet02:3306",
"mode": "R/O",
"readReplicas": {},
"role": "HA",
"status": "ONLINE"
},
"wallet03:3306": {
"address": "wallet03:3306",
"mode": "R/O",
"readReplicas": {},
"role": "HA",
"status": "ONLINE"
}
},
"topologyMode": "Single-Primary"
},
"groupInformationSourceMember": "wallet01:3306"
}
MySQL wallet01:3306 JS > \quit
Bye! [root@wallet01 ~]# yum install -y mysql-router [root@wallet01 ~]# mysqlrouter --bootstrap root@wallet01:3306 --user=mysqlrouter --name=router01 Please enter MySQL password for root: WARNING: The MySQL server does not have SSL configured and metadata used by the router may be transmitted unencrypted. # Reconfiguring system MySQL Router instance... - Checking for old Router accounts - No prior Router accounts found - Creating mysql account 'mysql_router1_a8933v9tcn8v'@'%' for cluster management - Storing account in keyring - Adjusting permissions of generated files - Creating configuration /etc/mysqlrouter/mysqlrouter.conf # MySQL Router 'router01' configured for the InnoDB cluster 'walletCluster' After this MySQL Router has been started with the generated configuration $ /etc/init.d/mysqlrouter restart or $ mysqlrouter -c /etc/mysqlrouter/mysqlrouter.conf the cluster 'walletCluster' can be reached by connecting to: ## MySQL Classic protocol - Read/Write Connections: localhost:6446 - Read/Only Connections: localhost:6447 ## MySQL X protocol - Read/Write Connections: localhost:64460 - Read/Only Connections: localhost:64470 Existing configuration backed up to '/etc/mysqlrouter/mysqlrouter.conf.bak' [root@wallet01 ~]# /etc/init.d/mysqlrouter start Starting mysqlrouter: [ OK ] [root@wallet01 ~]# /etc/init.d/mysqlrouter status mysqlrouter (pid 24451) is running... [root@wallet02 ~]# yum install -y mysql-router [root@wallet02 ~]# mysqlrouter --bootstrap root@wallet01:3306 --user=mysqlrouter --name=router02 [root@wallet02 ~]# /etc/init.d/mysqlrouter start Starting mysqlrouter: [ OK ] [root@wallet02 ~]# /etc/init.d/mysqlrouter status mysqlrouter (pid 6906) is running... [root@wallet03 ~]# yum install -y mysql-router [root@wallet03 ~]# mysqlrouter --bootstrap root@wallet01:3306 --user=mysqlrouter --name=router03 [root@wallet03 ~]# /etc/init.d/mysqlrouter start Starting mysqlrouter: [ OK ] [root@wallet03 ~]# /etc/init.d/mysqlrouter status mysqlrouter (pid 18081) is running...
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