MGR 上次搭建OK 后虽然做了个简单的单节点重启, MGR可以自动完成重组和组成员重配.
这次把MGR全部打开了后,发现了各自为重! 并没有自动开启MGR
mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+-----------+-------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+-----------+-------------+-------------+--------------+
| group_replication_applier | | | NULL | OFFLINE |
+---------------------------+-----------+-------------+-------------+--------------+
1 row in set (0.00 sec)
mysql> START GROUP_REPLICATION;
ERROR 3092 (HY000): The server is not configured properly to be an active member of the group. Please see more details on error log.
mysql> SET GLOBAL group_replication_bootstrap_group=ON;
Query OK, 0 rows affected (0.00 sec)
mysql> START GROUP_REPLICATION;
ERROR 3092 (HY000): The server is not configured properly to be an active member of the group. Please see more details on error log.
2019-06-23T11:21:45.187551Z 3 [ERROR] Plugin group_replication reported: 'binlog_checksum should be NONE for Group Replication'
mysql> sET GLOBAL binlog_checksum=none;
Query OK, 0 rows affected (0.42 sec)
mysql> START GROUP_REPLICATION;
Query OK, 0 rows affected (2.75 sec)
mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+--------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+--------------+-------------+--------------+
| group_replication_applier | ad216d41-5c3a-11e8-8720-08002791d97c | 192.168.2.21 | 3306 | ERROR |
+---------------------------+--------------------------------------+--------------+-------------+--------------+
1 row in set (0.00 sec)
原来两个MGR-SLAVE 是从其他主从关系复制过来的MYSQL系统.
mysql> show slave status\G;
1. row
Slave_IO_State:
Master_Host: 192.168.2.11
Master_User: rpl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: MYSQL-SLAVE1-relay-bin.000001怎么还记得老恋人呀?
STOP SLAVE;
RESET SLAVE ALL;
停止,并且清理所有的SLAVE信息.
重新设置主复制通道信息.
CHANGE MASTER TO MASTER_USER='repl',MASTER_PASSWORD='repl' FOR CHANNEL 'group_replication_recovery';
把3个参数添加到MY.CNF中
service mysqld stop
vim /etc/my.cnf
group_replication_allow_local_disjoint_gtids_join=ON
loose-group_replication_bootstrap_group=ON
binlog_checksum=none
service mysqld start
这样就自动启动MGR并且发现已经存在的成员,加入MGR组中.
我把节点1 也就是第一次配的节点 21 也改了
loose-group_replication_bootstrap_group=ON
结果呢! 死活加不进22和23的组中.
发现21 自己组个组!
我配的是多主模式啊? 难道会是单主!! 不可能.
loose-group_replication_bootstrap_group
表示由它负责建组 也就是MGR的主节点.
而 loose-group_replication_bootstrap_group
表示 启动MGR插件.
节点21主节点关闭后, 主节点就转移到其他节点上了.然后再重启就发现了两个主节点.
只有手工 SET GLOBAL loose-group_replication_bootstrap_group=OFF
重启大法是检验一切配置有没有问题的唯一真理