mysql主备部署[高可用]

配置方案

master:192.168.99.61    service-id:61
slave:192.168.99.62     service-id:62
同步账号:sync  　　　　　　 同步密码:sync

主:192.168.99.61步骤

1.配置同步账号

mysql>CREATE USER 'sync'@'%' IDENTIFIED BY 'sync';(但是我是使用navicat建的)
授权
mysql>grant replication slave on *.* to 'sync'@'192.168.99.62' identified by 'sync';
mysql>flush privileges;
mysql>exit

2.修改/etc/my.cnf添加

server-id=61
log-bin=mysql-bin
lower_case_table_names=1(数据表不区分大小写)

3.重启master端

service mysqld restart

mysql>show master status \G

备:192.168.99.62步骤

1.修改/etc/my.cnf

server-id=62
lower_case_table_names=1(数据表不区分大小写)

2.重启slave端

service mysqld restart

mysql>CHANGE MASTER TO MASTER_HOST='192.168.99.61',MASTER_USER='sync',MASTER_PASSWORD='sync',MASTER_LOG_FILE='mysql-bin.000019',MASTER_LOG_POS=2020109;

启动slave
mysql>start slave;
检查状态
mysql>show slave status \G

提示:Slave_IO_Running和Slave_SQL_Running两个值为YES基本上成功了

 检查状态

1.检查master

mysql>show processlist\G

*************************** 24. row ***************************
     Id: 157
   User: sync
   Host: 192.168.99.62:44517
     db: NULL
Command: Binlog Dump
   Time: 87
  State: Master has sent all binlog to slave; waiting for binlog to be updated
   Info: NULL
看到上面的Command: Binlog Dump说明配置成功!

2.检查slave

mysql>show slave status \G

mysql> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.99.61
                  Master_User: sync
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000019
          Read_Master_Log_Pos: 2144195
               Relay_Log_File: mysql3306-relay-bin.000002
                Relay_Log_Pos: 118676
        Relay_Master_Log_File: mysql-bin.000019
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 2144195
              Relay_Log_Space: 118853
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File: 
           Master_SSL_CA_Path: 
              Master_SSL_Cert: 
            Master_SSL_Cipher: 
               Master_SSL_Key: 
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 61
                  Master_UUID: 63a4da2b-2938-11e5-89c1-00505689cba6
             Master_Info_File: /usr/local/mysql/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
1 row in set (0.00 sec)

看到上面的Slave_IO_Running: Yes　　Slave_SQL_Running: Yes说明配置成功!

排错艰难过程

1.Slave_IO_Running: connecting　　Slave_SQL_Running: Yes

问题排查:pos不对,密码不对,网络问题(我重点放在pos, 我就是出错在pos)

重新手动同步

1.进入主库锁表

mysql> FLUSH TABLES WITH READ LOCK;
mysql> show master status;

2.进入从库

mysql>stop slave;
mysql>CHANGE MASTER TO MASTER_HOST='192.168.99.61',MASTER_USER='sync',MASTER_PASSWORD='sync',MASTER_LOG_FILE='xxx',MASTER_LOG_POS=xxx;
mysql>start slave;

3.回到主库解锁

mysql>unlock tables;

4.回到从库查看

mysql>show slave status \G

原图:

 2.事件回滚不一致导致，错误形态

解决方法，手动跳过这个错误

mysql>stop slave;
mysql>set global sql_slave_skip_counter =1; （这个是偏移量，可以是1，也可以是n，原理参考主从同步原理）
mysql>start slave；