本文主要和大家分享基於Docker的Mysql主從複製，希望能幫助大家。
環境簡介
主伺服器：JD雲端CentOS
從伺服器：Vultr雲端CentOS
為了方便測試，都使用Docker執行Mysql，Docker啟動指令如下：
docker run --name mysql-server-01 -p 3306:3306 -v "$PWD"/conf.d:/etc/mysql/conf.d -v /my/own/datadir:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest
以上皆將mysql設定目錄和data目錄對應到了宿主機器。
設定Master
為了方便，專門建立目錄來操作master資料庫，結構如下
#mysql
└── server01
├── conf.d
├── data
└── start.sh在cond.d建立my.cnf用來設定master
#[mysqld]log-bin=mysql-binserver-id=1innodb_flush_log_at_trx_commit=1sync_binlog=1
然後就可以啟動容器了。
啟動後，進入容器操作mysql
### 进入容器 docker exec -it 容器ID bash # 进入msyql客户端 mysql -u root -p # 新建salve用户并配置权限，格式如下 mysql> CREATE USER 'repl'@'%.example.com' IDENTIFIED BY 'password'; mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%.example.com'; # 查看master状态，这里file和position后面配置salve会用到mysql> show master status; +------------------+----------+--------------+------------------+-------------------+| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+| mysql-bin.000001 | 1092 | | | | +------------------+----------+--------------+------------------+-------------------+1 row in set (0.00 sec)#設定slave伺服器#slave my. cnf設定檔如下（這裡為了簡單，省去很多參數，不要用於生產環境）： #
[mysqld]server-id=2#然後啟動容器，進入mysql客戶端。
# 配置master到slave
mysql> CHANGE MASTER TO
-> MASTER_HOST='master_host_name', -> MASTER_USER='replication_user_name', -> MASTER_PASSWORD='replication_password', -> MASTER_LOG_FILE='recorded_log_file_name', -> MASTER_LOG_POS=recorded_log_position;上面的MASTER_LOG_FILE和MASTER_LOG_POS是前面show master stuas 看到的file和position
#1#1#cave##cavecave
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cave##cave##cave- ## 從4可行# 從咖啡
- #
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START SLAVE;
檢視運作狀態：
#o
mysql> show slave status\G;*************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: xxx.com Master_User: slave1 Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1092 Relay_Log_File: ca210e4caaaa-relay-bin.000002 Relay_Log_Pos: 813 Relay_Master_Log_File: mysql-bin.000001 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: 1092 Relay_Log_Space: 1027 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: 0Master_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: 5c2073ab-0ad6-11e8-a871-0242ac110005 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)上面Slave_IO_Running和Slave_SQL_Running都為YES，說明主從已經設定好了。 mysql常見架構有三種
