docker mysql 主从配置

前言

之前配置过windows的主从，现在来复习一下docker 的主从配置

主从原理

master库 ——》curd操作——-》记录到binlog日志中——-》通过IO线程——-》存储到ready log（中继日志）——》sql线程—–》写入到slave库

配置

1. master 配置

   # master 配置
   server-id=1             # 服务ID，主库一般设置为1
   log-bin=binlog          # 文件格式
   binlog_format=mixed        # 日志格式，stament,row,mixed

2. slave 配置

   # slave 配置
   server-id=2                # 服务ID
   log-bin=binlog
   binlog_format=mixed

3. master 创建拥有权限的用户，用来主备处理

   # 创建用户
   CREATE USER 'backup'@'%' IDENTIFIED BY '123456';
   # 授予权限
   GRANT ALL PRIVILEGES ON *.* TO 'backup'@'%' WITH GRANT OPTION;
   # 更新权限
   flush privileges;

4. 查看主库的日志状态

   # master 主库状态
   show master status
   +---------------+----------+--------------+------------------+-------------------+
   | File          | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
   +---------------+----------+--------------+------------------+-------------------+
   | binlog.000002 |      156 |              |                  |                   |
   +---------------+----------+--------------+------------------+-------------------+
   

5. 主备连接

   # docker master主库 ip地址
   change master to master_host='172.17.0.2',
   master_user='backup',
   master_password='123456',
   master_port=3306,
   master_log_file='binlog.000002',
   master_log_pos=156;
   
   # 开启slave
   start slave

6. 查看备库状态

   show slave status\G
   *************************** 1. row ***************************
                  Slave_IO_State: Waiting for master to send event
                     Master_Host: 172.17.0.2
                     Master_User: backup
                     Master_Port: 3306
                   Connect_Retry: 60
                 Master_Log_File: binlog.000012
             Read_Master_Log_Pos: 156
                  Relay_Log_File: 5dd396d0bfec-relay-bin.000003
                   Relay_Log_Pos: 365
           Relay_Master_Log_File: binlog.000012
                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: 156
                 Relay_Log_Space: 746
                 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: 3bc79f30-5616-11eb-9070-0242ac110002
                Master_Info_File: mysql.slave_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:
          Master_public_key_path:
           Get_master_public_key: 0
               Network_Namespace:
   
     # 重要参数
     Slave_IO_Running: Yes
     Slave_SQL_Running: Yes
     # 只有当这2个参数都为yes，才是真正联通

7. 测试流程

   # master 创建 库
   create database t1;
   create table test(id int(11) not null, name varchar(20) not null);
   # 这些创建完之后，从库也会有

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