MGR群集搭建

MGR群集搭建

环境

IP地址	主机名	数据库	端口号	Server_ID	操作系统
192.168.144.10	apenglinux-001.cn	MySQL5.7.26	3306	100	CentOS7.5
192.168.144.20	apenglinux-002.cn	MySQL5.7.26	3306	101	CentOS7.5
192.168.144.30	apenglinux-003.cn	MySQL5.7.26	3306	102	CentOS7.5

single master 模式

• 三台机作ip与主机名的映射关系

vim /etc/hosts   -- 加入以下内容
192.168.144.10 apenglinux-001.cn
192.168.144.20 apenglinux-002.cn
192.168.144.30 apenglinux-003.cn

• 单主master主机为apenglinux-001.cn

  vim /etc/my.cnf      -- 加入以下内容
  server_id=100
  gtid_mode=on
  enforce_gtid_consistency=on
  transaction_write_set_extraction=XXHASH64
  log_bin=apenglinux
  binlog_checksum=none
  binlog_format=row
  log_slave_updates=on
  master_info_repository=table
  relay_log_info_repository=table
  loose_group_replication_group_name='70546c9a-5a52-46a4-84ee-141ca4359966'
  loose_group_replication_local_address='apenglinux-001.cn:10001'
  loose_group_replication_start_on_boot=off
  loose_group_replication_group_seeds='apenglinux-001.cn:10001,apenglinux-002.cn:10002,apenglinux-003.cn:10003'
  loose_group_replication_group_bootstrap_group=off

• 重启mysqld
• 连接mysql，到(apenglinux-001.cn)mysql里的操作如下

mysql> set sql_log_bin=off;
mysql> grant replication slave on *.* to repl@'192.168.144.%' identified by '123456';
mysql> flush privileges;
mysql> set sql_log_bin=on;
mysql> change master to master_user='repl',master_password='123456' for channel 'group_replication_recovery';
mysql> install plugin group_replication soname 'group_replication.so';
mysql> set global group_replication_bootstrap_group=on;
mysql> start group_replication;
mysql> set global group_replication_bootstrap_group=off;
mysql> select * from performance_schema.replication_group_members;     -- 以下是查询到的内容
+---------------------------+--------------------------------------+-------------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST       | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------------+-------------+--------------+
| group_replication_applier | 8ea873c2-8f71-11e9-bbb4-000c298347f1 | apenglinux-001.cn |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-------------------+-------------+--------------+

• 从服务器(apenglinux-002.cn)的配置

  vim /etc/my.cnf    --  跟 apenglinux-001.cn一样的配置，只需要修改以下两行
  server_id=101
  loose_group_replication_local_address='apenglinux-002.cn:10002'
  重启mysqld
  连接msyql，到mysql里的操作如下
  mysql> set sql_log_bin=off;
  mysql> grant replication slave on *.* to repl@'192.168.144.%' identified by '123456';
  mysql> flush privileges;
  mysql> set sql_log_bin=on;
  mysql> change master to master_user='repl',master_password='123456' for channel 'group_replication_recovery';
  mysql>  install plugin group_replication soname 'group_replication.so';
  mysql> set global group_replication_allow_local_disjoint_gtids_join=on;
  mysql> start group_replication;
  mysql> select * from performance_schema.replication_group_members;
  +---------------------------+--------------------------------------+-------------------+-------------+--------------+
  | CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST       | MEMBER_PORT | MEMBER_STATE |
  +---------------------------+--------------------------------------+-------------------+-------------+--------------+
  | group_replication_applier | 8ea873c2-8f71-11e9-bbb4-000c298347f1 | apenglinux-001.cn |        3306 | ONLINE       |
  | group_replication_applier | a049b503-8f72-11e9-ba4b-000c2906c8f7 | apenglinux-002.cn |        3306 | ONLINE       |
  +---------------------------+--------------------------------------+-------------------+-------------+--------------+

• 从服务器apenglinux-003.cn的配置(与apenglinux-002.cn一样的配置)，下面是要修改的

vim /etc/my.cnf
server_id=102
loose_group_replication_local_address='apenglinux-003.cn:10003'

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST       | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------------+-------------+--------------+
| group_replication_applier | 8ea873c2-8f71-11e9-bbb4-000c298347f1 | apenglinux-001.cn |        3306 | ONLINE       |
| group_replication_applier | a049b503-8f72-11e9-ba4b-000c2906c8f7 | apenglinux-002.cn |        3306 | ONLINE       |
| group_replication_applier | d9fd5ea2-8f73-11e9-8f3b-000c29096feb | apenglinux-003.cn |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-------------------+-------------+--------------+

• 查看单主模式的主节点(所有的节点都可以查看)

  mysql> show global status like '%primary%';
  +----------------------------------+--------------------------------------+
  | Variable_name                    | Value                                |
  +----------------------------------+--------------------------------------+
  | group_replication_primary_member | 8ea873c2-8f71-11e9-bbb4-000c298347f1 |
  +----------------------------------+--------------------------------------+

MGR的多主模式

在 apenglinux-001.cn主机上的设置：
停止MGR，关掉单主模式，开启多主模式，开启引导组，开启mgr，关闭引导组

mysql> stop group_replication;
mysql> set global group_replication_single_primary_mode=off;
mysql> set global group_replication_enforce_update_everywhere_checks=on;
mysql> set global group_replication_bootstrap_group=on;
mysql> start group_replication;
mysql> set global group_replication_bootstrap_group=off;

在apenglinux-002.cn,apenglinux-003.cn上的设置：
停止mgr，允许写入，加入组，关掉单主模式，开启多主模式，开启mgr

mysql> stop group_replication;
mysql> set global read_only=off,super_read_only=off;
mysql> set global group_replication_allow_local_disjoint_gtids_join=on;
mysql> set global group_replication_single_primary_mode=off;
mysql> set global group_replication_enforce_update_everywhere_checks=on;
mysql> start group_replication;

查看成员信息

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST       | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------------+-------------+--------------+
| group_replication_applier | 8ea873c2-8f71-11e9-bbb4-000c298347f1 | apenglinux-001.cn |        3306 | ONLINE       |
| group_replication_applier | a049b503-8f72-11e9-ba4b-000c2906c8f7 | apenglinux-002.cn |        3306 | ONLINE       |
| group_replication_applier | d9fd5ea2-8f73-11e9-8f3b-000c29096feb | apenglinux-003.cn |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-------------------+-------------+--------------+