mysql5.5主从同步配置(semi_sync)

好久不折腾mysql主从了,发现5.5交之前的版本,配置上有些变化,趁着夜深人静,重温一下,顺便简单记录一下配置过程。

主从同步

master端配置

  1. 修改my.cnf文件
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vim /etc/my.cnf
[mysqld]
server-id = 1
log-bin = mysql-bin
binlog_format = mixed
expire-logs-days = 7
binlog-do-db = luxtarget
binlog-ignore-db = mysql
replicate-do-db = luxtarget
replicate-ignore-db = mysql
  1. 新建授权复制用户

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    grant replication slave on *.* to 'slave'@'xxx.xxx.xxx.xxx' identified by 'slave';
    flush privileges;
    
  2. 重启mysql

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    service mysqld restart
    
  3. 锁定数据库,将数据打包并拷贝至slave

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    flush tables with read lock;
    
  4. 查看master上二进制日志情况,记录FilePosition

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    show master status;
    
  5. 当数据打包拷贝完毕,解除锁定;

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    ublock tables;
    

    当数据较大时,将数据打包备份比使用mysqldump导入时效率更高

slave端配置

  1. 修改my.cnf文件

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    vim /etc/my.cnf
    [mysqld]
    server-id = 2
    log-bin = mysql-bin
    binlog_format = mixed
    expire-logs-days = 7
    binlog-do-db = luxtarget
    binlog-ignore-db = mysql
    replicate-do-db = luxtarget
    replicate-ignore-db = mysql
    
  2. 重启mysql

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    service mysqld restart
    
  3. 将从master拷贝来的数据导入slave

  4. 连接master开始同步

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    change master to master_host='xxx.xxx.xxx.xxx',master_user='slave',master_password='slave',master_log_file='master-bin.xxxxxx,master_log_pos=xxx;
    
    start slave;
    
    show slave status\G;
    

    当Slave_IO_Running与Slave_SQL_Running的状态都为Running时即可。

半同步配置

master端配置

  1. 安装mysql半同步插件

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    INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';
    SET GLOBAL rpl_semi_sync_master_enabled = 1;
    SET GLOBAL rpl_semi_sync_master_timeout = 1000;
    
  2. 修改my.cnf文件

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    vim /etc/my.cnf
    [mysqld]
    rpl_semi_sync_master_enabled=1 #启用半同步
    rpl_semi_sync_master_timeout=1000 #超时时间为1s
    
  3. 重启mysql

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    service mysqld restart
    

slave端配置

  1. 安装mysql半同步插件

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    INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave.so';
    SET GLOBAL rpl_semi_sync_slave_enabled = 1;
    STOP SLAVE IO_THREAD;
    START SLAVE IO_THREAD;
    
  2. 修改my.cnf文件

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    rpl_semi_sync_slave_enabled=1  #启用半同步复制
    
  3. 重启mysql

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    service mysqld restart
    

检查配置

  1. master

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    SHOW GLOBAL STATUS LIKE 'rpl_semi%';
    +--------------------------------------------+-------+
    | Variable_name                              | Value |
    +--------------------------------------------+-------+
    | Rpl_semi_sync_master_clients               | 1     |
    | Rpl_semi_sync_master_net_avg_wait_time     | 0     |
    | Rpl_semi_sync_master_net_wait_time         | 0     |
    | Rpl_semi_sync_master_net_waits             | 0     |
    | Rpl_semi_sync_master_no_times              | 0     |
    | Rpl_semi_sync_master_no_tx                 | 0     |
    | Rpl_semi_sync_master_status                | ON    |
    | Rpl_semi_sync_master_timefunc_failures     | 0     |
    | Rpl_semi_sync_master_tx_avg_wait_time      | 0     |
    | Rpl_semi_sync_master_tx_wait_time          | 0     |
    | Rpl_semi_sync_master_tx_waits              | 0     |
    | Rpl_semi_sync_master_wait_pos_backtraverse | 0     |
    | Rpl_semi_sync_master_wait_sessions         | 0     |
    | Rpl_semi_sync_master_yes_tx                | 0     |
    +--------------------------------------------+-------+
    14 rows in set (0.00 sec)
    
  2. slave

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    mysql> SHOW GLOBAL STATUS LIKE 'rpl_semi%';
    +----------------------------+-------+
    | Variable_name              | Value |
    +----------------------------+-------+
    | Rpl_semi_sync_slave_status | ON    |
    +----------------------------+-------+
    1 row in set (0.01 sec)