MGR安装记录

装好全部MySQL5.7， 打开GTID

修改my.cnf文件：

## group replication
transaction_write_set_extraction = XXHASH64
## 这里随机生成一个UUID，必定要是UUID
loose-group_replication_group_name = "9ac06b4e-13aa-11e7-a62e-5254004347f9"
loose-group_replication_start_on_boot = off
## 这是本机的IP，同时找一个端口
loose-group_replication_local_address = "192.168.150.131:23306"
## 这里是群组的全部机器
loose-group_replication_group_seeds = "192.168.150.131:23306,192.168.150.134:23307,192.168.150.135:23308"
loose-group_replication_bootstrap_group = off
## 这两个选项配置单主模式
loose-group_replication_single_primary_mode = true
loose-group_replication_enforce_update_everywhere_checks = false

binlog_checksum=none

全部节点上都要安装插件：

INSTALL PLUGIN group_replication SONAME 'group_replication.so';

在一台节点上执行这些命令：

SET SQL_LOG_BIN=0;
grant replication slave on *.* to repl@'%' identified by 'repl';
change master to master_user='repl',master_password='repl' for channel 'group_replication_recovery';
set global group_replication_bootstrap_group=ON;
set global group_replication_allow_local_disjoint_gtids_join=ON;
start group_replication;

在其余的节点上执行这些命令：

SET SQL_LOG_BIN=0;
grant replication slave on *.* to repl@'%' identified by 'repl';
change master to master_user='repl',master_password='repl' for channel 'group_replication_recovery';
set global group_replication_allow_local_disjoint_gtids_join=ON;
start group_replication;

这时在任意一个节点上执行下面的命令：

select * from performance_schema.replication_group_members;

注意，在引导节点上第一次就须要进行这个设置：

set global group_replication_bootstrap_group=ON;

可是此时默认的设置是除了引导节点以外其余节点都是非只读状态的：

set global read_only=OFF;
set global super_read_only=OFF;