• 快速运行一个mysql-slave 的容器，去同步 mysql主库的数据
• 可用于一些从库数据的调试
• 可用于临时的主从数据备份

• 定义docker-compose 文件内的 变量

      MYSQL_ROOT_PASSWORD: "srebro@2024"                        # 从库root密码
      MYSQL_REPLICATION_USER: "repluser"                        # 主从同步账户
      MYSQL_REPLICATION_PASSWORD: "srebro@test"                 # 同步账户密码
      MYSQL_MASTER_HOST: "172.16.8.137"                         # 主库IP地址
      MYSQL_MASTER_PORT: 3306                                   # 主库端口
      MYSQL_BACKUP_USER: "user"                                 #数据库备份用户主库root一般不让远程登录()
      MYSQL_BACKUP_USER_PASSWORD: "srebro@2024"                 #数据库备份用户密码
      MYSQL_BACKUP_DATABASES: "cmdb01,cmdb02,cmdb03"            # 需要备份的数据库，需要主从同步的数据库（多个数据库逗号分隔）
      TZ: 'Asia/Shanghai'                                       # 时区
    command: --server-id=138 --relay-log=mysqld-relay-bin --replicate-do-db=cmdb01 --replicate-do-db=cmdb02 --replicate-do-db=cmdb03  #指定server-id 值； 指定--relay-log 名称； 指定同步的数据库，--replicate-do-db=cmdb01 --replicate-do-db=cmdb02 --replicate-do-db=cmdb03 多个库要分开写,有几个写几个

• 定义 healthcheck 健康检查的MYSQL_ROOT_PASSWORD

    healthcheck:
      test: ["CMD", "mysqladmin", "ping", "-u", "root", "-psrebro@2024"]

• 根据自己的需求定义my.cnf 配置文件[以下参数仅供参考]

[mysqld]
# MySQL服务运行的用户
user=mysql

# MySQL服务监听的端口
port=3306

# 最大连接数
max_connections=1000

# 默认的存储引擎
default-storage-engine=INNODB

# 服务器默认字符集
character-set-server=utf8mb4

# 服务器默认的校对规则
collation_server = utf8mb4_general_ci

# 禁用域名解析，提高性能，只允许IP地址进行客户端登录
skip-name-resolve=1

# 表名不区分大小写，1表示开启
lower_case_table_names=1

# 日志时间戳格式，SYSTEM表示使用系统时间
log_timestamps=SYSTEM

# 设置默认的时区
default-time-zone = '+8:00'


# 错误日志文件的存储路径
log-error=/var/lib/mysql/mysqld.log



# 从库不进行同步的数据库
replicate-ignore-db=mysql
replicate-ignore-db=information_schema
replicate-ignore-db=sys
replicate-ignore-db=performance_schema

# 禁用SSL
skip_ssl

# MySQL服务的Unix套接字文件
socket=/var/run/mysqld/mysqld.sock

# 启用的SQL模式，定义了MySQL的行为
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

# 最大允许的数据包大小
max_allowed_packet=512M

[mysql]
# 客户端使用的Unix套接字文件
socket=/var/run/mysqld/mysqld.sock

# 客户端默认字符集
default-character-set = utf8mb4

[client]
# 客户端程序默认使用的字符集
default-character-set = utf8mb4

• 运行

docker-compose up -d

• 登录容器查看主从状态

bash-4.2# mysql -uroot -psrebro@2024 -e "show slave status\G;"


mysql: [Warning] Using a password on the command line interface can be insecure.
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.16.8.137
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000034
          Read_Master_Log_Pos: 56784180
               Relay_Log_File: mysqld-relay-bin.000070
                Relay_Log_Pos: 56784393
        Relay_Master_Log_File: mysql-bin.000034
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: cmdb01,cmdb02,cmdb03
          Replicate_Ignore_DB: mysql,information_schema,sys,performance_schema
           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: 56784180
              Relay_Log_Space: 56784648
              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: 37
                  Master_UUID: 2740c8cc-b6b4-11ed-909f-000c29ae36d9
             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: 

• 主从同步账户授权SQL

mysql> grant replication slave on *.* to repluser@"%" identified by "srebro@test";