参考：
https://blog.csdn.net/m0_58574228/article/details/122509685
https://www.jb51.net/article/236243.htm

安装Docker

下载Docker依赖的环境

 yum -y install yum-utils device-mapper-persistent-data lvm2
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指定Docker镜像源

默认下载Docker回去国外服务器下载，速度较慢，我们可以设置为阿里云镜像源，速度更快

 yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
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安装Docker

 yum makecache fast
 yum -y install docker-ce
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启动Docker

 # 启动Docker服务
 systemctl start docker
 # 设置开机自启
 systemctl enable docker
 # 查看docker的版本
 docker -v
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拉取Mysql5.7镜像，并创建一主一从两个容器

拉取Mysql5.7镜像

docker pull mysql:5.7
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创建主备的配置和数据文件夹

主节点配置目录为：/usr/local/docker/mysql/master/conf
主节点data目录为：/usr/local/docker/mysql/master/data

从节点配置目录为：/usr/local/docker/mysql/slave/conf
从节点data目录为：/usr/local/docker/mysql/slave/data

主节点配置文件

cd /usr/local/docker/mysql/master/conf
vim my.cnf
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配置内容为：

[mysqld]
## 同一局域网内注意要唯一
server-id=100
## 开启二进制日志功能，可以随便取（关键）
log-bin=mysql-bin
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从节点配置文件

cd /usr/local/docker/mysql/slave/conf
vim my.cnf
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配置内容为：

[mysqld]
## 设置server_id,注意要唯一
server-id=101
## 开启二进制日志功能，以备Slave作为其它Slave的Master时使用
log-bin=mysql-slave-bin
## relay_log配置中继日志
relay_log=edu-mysql-relay-bin
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创建主节点容器

创建命令为：

	docker run --name mysql-master -p 3307:3306 -v /usr/local/docker/mysql/master/data:/var/lib/mysql -v /usr/local/docker/mysql/master/conf:/etc/mysql/ -e MYSQL_ROOT_PASSWORD=123456 -d 2a0961b7de03
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具体参数可以百度查询含义，其中2a0961b7de03是镜像id

进入容器并进行设置

docker exec -it mysql-master /bin/bash

mysql -u root -p     

CREATE USER 'slave'@'%' IDENTIFIED BY '123456';

GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';
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查看master状态

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 |     617 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

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创建从节点容器

创建命令为：

	docker run --name mysql-slave -p 3308:3306 -v /usr/local/docker/mysql/slave/data:/var/lib/mysql -v /usr/local/docker/mysql/slave/conf:/etc/mysql/ -e MYSQL_ROOT_PASSWORD=123456 -d 2a0961b7de03
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具体参数可以百度查询含义，其中2a0961b7de03是镜像id

进入容器并进行设置

docker exec -it mysql-slave /bin/bash

mysql -u root -p     

change master to master_host='127.0.0.1', master_port=3307, master_user='slave',master_password='123456',master_log_file='mysql-bin.000003', master_log_pos=617;

start slave;

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 127.0.0.1
                  Master_User: slave
                  Master_Port: 3307
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 1330
               Relay_Log_File: edu-mysql-relay-bin.000002
                Relay_Log_Pos: 1033
        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: 1330
              Relay_Log_Space: 1244
              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: 100
                  Master_UUID: 943bb36c-f2b7-11ec-b975-0242ac110002
             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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当 Slave_IO_State: Waiting for master to send event时，表示监听成功，在主节点的操作会同步到从节点。