docker mysql 主從配置

前言

之前配置過windows的主從，現在來複習一下docker 的主從配置

主從原理

master庫 ——》curd操作——-》記錄到binlog日誌中——-》通過IO執行緒——-》儲存到ready log（中繼日誌）——》sql執行緒—–》寫入到slave庫

配置

1. master 配置

   # master 配置
   server-id=1             # 服務ID，主庫一般設定為1
   log-bin=binlog          # 檔案格式
   binlog_format=mixed        # 日誌格式，stament,row,mixed

2. slave 配置

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

3. master 建立擁有許可權的使用者，用來主備處理

   # 建立使用者
   CREATE USER 'backup'@'%' IDENTIFIED BY '123456';
   # 授予許可權
   GRANT ALL PRIVILEGES ON *.* TO 'backup'@'%' WITH GRANT OPTION;
   # 更新許可權
   flush privileges;

4. 檢視主庫的日誌狀態

   # master 主庫狀態
   show master status
   +---------------+----------+--------------+------------------+-------------------+
   | File          | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
   +---------------+----------+--------------+------------------+-------------------+
   | binlog.000002 |      156 |              |                  |                   |
   +---------------+----------+--------------+------------------+-------------------+
   

5. 主備連線

   # docker master主庫 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;
   
   # 開啟slave
   start slave

6. 檢視備庫狀態

   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:
   
     # 重要引數
     Slave_IO_Running: Yes
     Slave_SQL_Running: Yes
     # 只有當這2個引數都為yes，才是真正聯通

7. 測試流程

   # master 建立 庫
   create database t1;
   create table test(id int(11) not null, name varchar(20) not null);
   # 這些建立完之後，從庫也會有

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