MySQL 8.0 MGR 克隆技术
8.0MGR克隆插件恢复节点流程
1.写节点建账号赋权
CREATE USER 'clone_user'@'%' IDENTIFIED BY 'clone123456';
GRANT BACKUP_ADMIN on *.* to 'clone_user'@'%';
在作为来源的节点安装clone插件
INSTALL PLUGIN clone SONAME '[mysql_clone.so](http://mysql_clone.so/)';
2.在新节点建账号赋权安装clone插件
CREATE USER 'clone_user'@'%' IDENTIFIED BY 'clone123456';
GRANT CLONE_ADMIN on *.* to 'clone_user'@'%';
INSTALL PLUGIN clone SONAME '[mysql_clone.so](http://mysql_clone.so/)';
指定来源节点IP和端口(到从节点上拉取数据)
SET GLOBAL clone_valid_donor_list = '172.30.0.19:6003';
插件安装:
install plugin group_replication soname '[group_replication.so](http://group_replication.so/)';
install plugin rpl_semi_sync_master soname '[semisync_master.so](http://semisync_master.so/)';
install plugin rpl_semi_sync_slave soname '[semisync_slave.so](http://semisync_slave.so/)';
exit
3.新节点登录克隆账号执行命令
mysql -uclone_user -p
CLONE INSTANCE FROM 'clone_user'@'172.30.0.19':6003 IDENTIFIED BY 'clone123456';
exit
4.新节点开启组复制并检查MGR集群状态
mysql -uroot -p
start group_replication;
select * from performance_schema.replication_group_members;
注意!新节点的my.cnf要预先设置好MGR相关内容否则无法打开组复制
CHANGE MASTER TO MASTER_USER='replication', MASTER_PASSWORD='RbHxkIfDmv4ReXHN' FOR CHANNEL 'group_replication_recovery';
注意:
在 做 start group_replication 操作之后,如果发现报错,注意查看报错信息,
show processlist; 之后发现有新的应用连接进来,导致产生了多的gtid事物,解决方法:
1.将连接的应用ip 暂时性加入防火墙
2.重做克隆