演示一下在MySQL下搭建多主一从的过程。
实验环境：
192.168.24.129:3306
192.168.24.129:3307
192.168.24.129:3308
主库操作
导出数据
分别在3306和3307上导出需要的数据库。
3306：
登录数据库：
[root@localhost 3306]# mysql -uroot -poldboy123 -S /tmp/mysql3306.sock
锁表：
mysql> flush tables with read lock;
状态点：
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000006 | 154 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
另开窗口开始导数据：
[root@localhost tmp]# mysqldump -uroot -poldboy123 -S /tmp/mysql3306.sock -F -R -x --master-data=2 -A --events|gzip >/tmp/dockerwy.sql.gz
在此查看状态点两个要保持一致，否则表没有锁住
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000007 | 154 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
解锁表：
mysql> unlock tables;
3307：
登录3307数据库：
[root@localhost 3307]# mysql -uroot -poldboy123 -S /tmp/mysql3307.sock
锁表：
mysql>flush tables with read lock;
查看状态点：
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000007 | 154 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
另开窗口导数据：
[root@localhost 3307]# mysqldump -uroot -poldboy123 -S /tmp/mysql3307.sock -F -R -x --master-data=2 -A --events|gzip >/tmp/dockerwy_2.sql.gz
从新查看状态点：
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000008 | 154 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
解锁表：
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)
建立授权账号
分别在3306和3307上面建立授权账号
3306：
mysql> grant replication slave on *.* to 'backup'@'192.168.24.129' identified by 'backup';
3307：
mysql> grant replication slave on *.* to 'backup'@'192.168.24.129' identified by 'backup';
从库操作
修改从库存储方式
修改3308的master-info和relay-info方式，从文件存储改为表存储。
编辑配置文件
[root@localhost 3308]# vim my.cnf
在[mysqld]模块下添加如下两行
master_info_repository=TABLE
relay_log_info_repository=TABLE
重启3308数据库：
[root@localhost 3308]# /data/3308/mysqld restart
重启之后我们可以登录数据库查看；
[root@localhost 3308]# mysql -uroot -poldboy123 -S /tmp/mysql3308.sock
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.16 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show variables like 'relay_log_info_repository';
+---------------------------+-------+
| Variable_name | Value |
+---------------------------+-------+
| relay_log_info_repository | TABLE |
+---------------------------+-------+
1 row in set (0.01 sec)
mysql> show variables like 'master_info_repository';
+------------------------+-------+
| Variable_name | Value |
+------------------------+-------+
| master_info_repository | TABLE |
+------------------------+-------+
1 row in set (0.01 sec)
导入数据
导入3306的数据：
[root@localhost 3308]# gzip -d /tmp/dockerwy.sql.gz
[root@localhost 3308]# mysql -uroot -poldboy123 -S /tmp/mysql3308.sock < /tmp/dockerwy.sql.
导入3307的数据：
[root@localhost 3308]# gzip -d /tmp/dockerwy_2.sql.gz
[root@localhost 3308]# mysql -uroot -poldboy123 -S /tmp/mysql3308.sock < /tmp/dockerwy_2.sql
执行change master to
登录slave进行同步操作，分别change master两台服务器，后面以for channel ‘channel_name’区分