Mysql5.7主从配置

Mysql5.7配置主从同步

Posted by Jae on March 19, 2019

前提

假设我们以将安装好了mysql(这里我们使用的版本是5.7.25),系统环境为centos7masterslave机器IP如下:

master 192.168.10.101
slave 192.168.10.61

1、配置master

1.1 编辑/etc/my.cnf文件

在文件增加如下配置

[mysqld]
server-id=101  # 通常为本机ip后几位
log-bin=master-bin  # 开启master的binlog
log-bin-index=master-bin.index

重启mysql

systemctl restart mysqld
1.2 查看master的binlog

下面的master-bin.000005将会在slave配置中使用

mysql> show master status;
+-------------------+----------+--------------+------------------+-------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| master-bin.000005 |    20034 |              |                  |                   |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
1.3 创建用于主从同步的用户
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.10.61' IDENTIFIED BY 'mysql';
mysql> flush privileges;

表示允许从库从192.168.10.61使用repl用户访问主库。

2、配置slave

2.1 编辑/etc/my.cnf文件

在文件增加如下配置

[mysqld]
server-id=61  # 通常为机器ip后几位
relay-log-index=slave-relay-bin.index
relay-log=slave-relay-bin # slave日志中继

重启mysql

systemctl restart mysqld
2.2 配置master信息
mysql> change master to master_host='192.168.10.101',master_port=3306,master_user='repl',master_password='mysql',master_log_file='master-bin.000005',master_log_pos=0;
mysql> start slave;

这里的master-bin-000005文件是在master数据库中使用show master status获取到的。

3、验证主从同步

slave机器上查看slave状态:

    mysql> show slave status \G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.10.101
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master-bin.000005
          Read_Master_Log_Pos: 20034
               Relay_Log_File: slave-relay-bin.000002
                Relay_Log_Pos: 20249
        Relay_Master_Log_File: master-bin.000005
             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: 20034
              Relay_Log_Space: 20456
              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: 101
                  Master_UUID: e4d0a3a6-4947-11e9-9ddf-52540049495f
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           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
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.01 sec)

ERROR:
No query specified

如果看到slaveSlave_IO_Running: Yes 和Slave_SQL_Running: Yes都是开启的且没有错误提示就说明主从配置已经成功。