mysql双主设置

1.前台通过管理平台创建数据库；
2.备份数据库，并还原到另一台主机；
备份同时要备份表和 函数 结构
[root@vm702 ~]# mysqldump -uroot -p hetestdb > testdb.1.sql
[root@vm702 ~]# mysqldump -uroot -p -ntd -R hetestdb >> testdb.1.sql


导入时，可能会报错，
ERROR 1418 (HY000) at line 31: This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)
需要执行
mysql> SET GLOBAL log_bin_trust_function_creators = 1;
然后导入不会提示错误
创建同名数据库。
[root@vm703 dump]# mysql -u root -p hetestdb < testdb.1.sql 


3. 配置/etc/my.cnf
配置两台主机的配置文件
[mysqld]
event_scheduler=1
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
symbolic-links=0
innodb_buffer_pool_size=256M
log_bin_trust_function_creators=1


log-bin=mysql52-bin
relay-log=relay-bin
read-only=0
relay-log-index=relay-bin-index
server_id=152
binlog-do-db=zbkc1207001          
replicate-do-db=zbkc1207001
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES


[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid


另外一台：
[mysqld]
event_scheduler=1
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
symbolic-links=0
innodb_buffer_pool_size=256M
log_bin_trust_function_creators=1


log-bin=mysql52-bin
relay-log=relay-bin
read-only=0
relay-log-index=relay-bin-index
server_id=52   //这个值要不同。
binlog-do-db=zbkc1207001          
replicate-do-db=zbkc1207001
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES


[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid


4.先配置一台，
首先查看一台master：
mysql> show master status;
+--------------------+----------+--------------+------------------+-------------------+
| File               | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+--------------------+----------+--------------+------------------+-------------------+
| mysql52-bin.000016 |      120 | zbkc1207001  |                  |                   |
+--------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)


配置另外一台同步：
mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)


mysql> change master to master_host='192.168.70.2',master_user='root',master_password='123456', master_port=3306, master_log_file='mysql52-bin.000016', master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.00 sec)


mysql> start slave;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository


报错，处理方法
mysql> reset slave;  //重新设置slave;
Query OK, 0 rows affected (0.00 sec)


mysql> change master to master_host='192.168.70.2',master_user='root',master_password='123456', master_port=3306, master_log_file='mysql52-bin.000016', master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.03 sec)


mysql> start slave;
Query OK, 0 rows affected (0.00 sec)


mysql> show slave status\G;
        Relay_Master_Log_File: mysql52-bin.000016
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: zbkc1207001
两个YES表示同步成功。


配置另外一台，同样操作。 master_host写对方IP master_log_file master_log_pos写成对方show master status;查询值。