MySQL 5.7 MGR搭建

Master：192.168.100.1

Slave1：192.168.100.2

Slave2：192.168.100.3

安装组复制插件

mysql> install plugin group_replication soname 'group_replication.so';

主库设置通道

mysql> set sql_log_bin=0;
Query OK, 0 rows affected (0.00 sec)

mysql> grant replication slave on *.* to rep@'%' identified by 'rep';
Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> set sql_log_bin=1;
Query OK, 0 rows affected (0.00 sec)

mysql> change master to
    -> master_user='rep',
    -> master_password='rep' for channel 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.25 sec)

启动GR

mysql> set global group_replication_bootstrap_group=on;
Query OK, 0 rows affected (0.00 sec)

mysql> start group_replication;
Query OK, 0 rows affected (2.12 sec)

从库两个节点加入复制组（操作相同）

mysql> install plugin group_replication soname 'group_replication.so';
Query OK, 0 rows affected (0.16 sec)

mysql> set sql_log_bin=0;
Query OK, 0 rows affected (0.00 sec)

mysql> grant replication slave on *.* to rep@'%' identified by 'rep';
Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> set sql_log_bin=1;
Query OK, 0 rows affected (0.00 sec)

mysql> change master to
    -> master_user='rep',
    -> master_password='rep' for channel 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.02 sec)

mysql> start group_replication;

*注意* 若启动GR时报错ERROR 3092，执行：set global group_replication_allow_local_disjoint_gtids_join=ON;（感谢CSDN博主lijingkuan，这个解决方法是从他的博客上看到的）

查看组成员状态

         查看是否为主节点：

            node 1

mysql> select if((select @@server_uuid) = (select variable_value from performance_schema.global_status where variable_name = 'group_replication_primary_member'),1,0) as is_primary_mode ,@@server_id;
+-----------------+-------------+
| is_primary_mode | @@server_id |
+-----------------+-------------+
|               1 |    10013306 |
+-----------------+-------------+
1 row in set (0.00 sec)

               node 2

mysql> select if((select @@server_uuid) = (select variable_value from performance_schema.global_status where variable_name = 'group_replication_primary_member'),1,0) as is_primary_mode ,@@server_id;
+-----------------+-------------+
| is_primary_mode | @@server_id |
+-----------------+-------------+
|               0 |    10023306 |
+-----------------+-------------+
1 row in set (0.00 sec)

               node 3

mysql> select if((select @@server_uuid) = (select variable_value from performance_schema.global_status where variable_name = 'group_replication_primary_member'),1,0) as is_primary_mode ,@@server_id;
+-----------------+-------------+
| is_primary_mode | @@server_id |
+-----------------+-------------+
|               0 |    10033306 |
+-----------------+-------------+
1 row in set (0.00 sec)

            查看组成员信息

                node 1

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+--------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST  | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+--------------+-------------+--------------+
| group_replication_applier | a18e7228-466b-11e9-86e7-000c290e71ea | mysql-master |        3306 | ONLINE       |
+---------------------------+--------------------------------------+--------------+-------------+--------------+
1 row in set (0.00 sec)

              查看组成员状态

mysql> select * from performance_schema.replication_group_member_stats\G
*************************** 1. row ***************************
                      CHANNEL_NAME: group_replication_applier
                           VIEW_ID: 15525782630353927:9
                         MEMBER_ID: a18e7228-466b-11e9-86e7-000c290e71ea
       COUNT_TRANSACTIONS_IN_QUEUE: 0
        COUNT_TRANSACTIONS_CHECKED: 0
          COUNT_CONFLICTS_DETECTED: 0
COUNT_TRANSACTIONS_ROWS_VALIDATING: 0
TRANSACTIONS_COMMITTED_ALL_MEMBERS: 6953c9da-466c-11e9-8fee-000c2995023e:1-3,
a18e7228-466b-11e9-86e7-000c290e71ea:1-3,
a876d35e-9110-11e6-a365-842b2b5909d6:1-5
    LAST_CONFLICT_FREE_TRANSACTION: 
1 row in set (0.00 sec)

                查看当前节点状态

mysql> select * from performance_schema.replication_group_members where member_id=(select variable_value from performance_schema.global_status where variable_name='group_replication_primary_member');
+---------------------------+--------------------------------------+--------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST  | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+--------------+-------------+--------------+
| group_replication_applier | a18e7228-466b-11e9-86e7-000c290e71ea | mysql-master |        3306 | ONLINE       |
+---------------------------+--------------------------------------+--------------+-------------+--------------+
1 row in set (0.00 sec)