准备

• 主库：192.168.137.10
• 备库：192.168.137.11
• MySQL 5.7

主库 192.168.137.10

• 安装好MySQL
• 修改 /etc/mysql/my.cnf

[mysqld]
server-id               = 1
log_bin                 = /var/log/mysql/mysql-bin.log
expire_logs_days        = 10
max_binlog_size   = 100M
#binlog_do_db           = include_database_name  # 只同步哪个库
binlog_ignore_db        = mysql  # 不同步哪个库 默认是全部
binlog_format           = row  # binlog的格式 row 具有 statement和mixed 不具备的优势 填写 row
sync_binlog = 1  
innodb_flush_log_at_trx_commit = 1  # 和 sync_binlog 组成双1 配置 保证数据的完整性

• restart mysql
• 创建用于同步的用户

create user 'slave2'@'192.168.137.11' identified by '123456';  # 创建用户
grant replication slave on *.* to 'slave2'@'192.168.137.11';  # 赋予权限

• 查看master的状态

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 |     2020 |              | mysql            |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

备库192.168.137.11

• 修改 /etc/mysql/my.cnf

[mysqld]
server-id               = 2

• restart mysql
• 建立主备关系

mysql> set global read_only=1;
Query OK, 0 rows affected (0.01 sec)  # 备库只读

mysql> show slave status;
0 row in set (0.00 sec)

mysql> CHANGE MASTER TO
    ->     MASTER_HOST='192.168.137.10',
    ->     MASTER_USER='slave2',
    ->     MASTER_PASSWORD='123456',
    ->     MASTER_LOG_FILE='mysql-bin.000003',  # 从master status上面取
    ->     MASTER_LOG_POS=2020;  # 从 master status 上面取值
Query OK, 0 rows affected, 2 warnings (0.02 sec)

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.137.10
                  Master_User: slave2
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 2589
               Relay_Log_File: ubuntu-relay-bin.000002
                Relay_Log_Pos: 889
        Relay_Master_Log_File: mysql-bin.000003
             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: 2589
              Relay_Log_Space: 1097
              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: 1
                  Master_UUID: a9f2f5ee-6697-11e9-8366-000c29d657d4
             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 (0.00 sec)

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