1.下拉mysql镜像：

docker pull mysql

此处选择在主机上保存配置文件，从而不会出现docker服务重启，配置文件需要重新配置的问题。

2.准备master的配置文件：

mkdir -p /usr/local/mysqlData/master/cnf
mkdir -p /usr/local/mysqlData/master/data
vim /usr/local/mysqlData/master/cnf/mysql.cnf

[mysqld]
pid-file=/var/run/mysqld/mysqld.pid
socket=/var/run/mysqld/mysqld.sock
datadir=/var/lib/mysql
secure-file-priv= NULL
server-id=1
symbolic-links=0
log-bin=mysql-bin
lower_case_table_names=1
!includedir /etc/mysql/conf.d/

3.启动master容器：

docker run -itd -p 3306:3306 --name mysqlMaster -v /usr/local/mysqlData/master/cnf/mysql.cnf:/etc/mysql/my.cnf -v /usr/local/mysqlData/master/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 --privileged=true mysql:latest --character-set-server=utf8

将容器端口3306映射到外部端口3306，启动唯一容器名为mysqlMaster，本地目录/usr/local/mysqlData/master/cnf和/usr/local/mysqlData/master/data均挂载到容器对应目录上，连接密码为123456

4.开启远程访问：

docker exec -it mysqlMaster bash

mysql -u root -p

123456

mysql> select host,user,plugin,authentication_string from mysql.user;
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
| host      | user             | plugin                | authentication_string                                                  |
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
| %         | root             | caching_sha2_password | $A$005$;Yb9H*Y ?I_B&ba}CHlwIJ731GtvTcZXlmnUxWRKicnQJLL4le1KwHW1iv2 |
| localhost | mysql.infoschema | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.session    | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.sys        | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | root             | caching_sha2_password | $A$005$eeFC b;CHcIdH>eZkK21qbAw8DGu7SYUxWTLkkM8GprvKkEQLyAZcH/mDA |
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
5 rows in set (0.00 sec)

plugin的值为：caching_sha2_password 的账户，均需要修改密码。

ALTER USER 'root'@'%' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';

FLUSH PRIVILEGES;

5.准备slave的配置文件：

mkdir -p /usr/local/mysqlData/slave/cnf
mkdir -p /usr/local/mysqlData/slave/data
vim /usr/local/mysqlData/slave/cnf/mysql.cnf

[mysqld]
pid-file=/var/run/mysqld/mysqld.pid
socket= /var/run/mysqld/mysqld.sock
datadir=/var/lib/mysql
secure-file-priv= NULL
server-id=2
relay_log_recovery=0
symbolic-links=0
log-bin=mysql-bin
lower_case_table_names=1
!includedir /etc/mysql/conf.d/

6.启动slave容器：

docker run -d -p 3307:3306 --name mysqlSlave -v /usr/local/mysqlData/slave/cnf/mysql.cnf:/etc/mysql/my.cnf -v /usr/local/mysqlData/slave/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 --privileged=true mysql:latest --character-set-server=utf8

7.开启远程访问：

docker exec -it mysqlSlave bash

mysql -u root -p

123456

mysql> select host,user,plugin,authentication_string from mysql.user;
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
| host      | user             | plugin                | authentication_string                                                  |
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
| %         | root             | caching_sha2_password | $A$005$;Yb9H*Y ?I_B&ba}CHlwIJ731GtvTcZXlmnUxWRKicnQJLL4le1KwHW1iv2 |
| localhost | mysql.infoschema | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.session    | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.sys        | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | root             | caching_sha2_password | $A$005$eeFC b;CHcIdH>eZkK21qbAw8DGu7SYUxWTLkkM8GprvKkEQLyAZcH/mDA |
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
5 rows in set (0.00 sec)

plugin的值为：caching_sha2_password 的账户，均需要修改密码。

ALTER USER 'root'@'%' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';

FLUSH PRIVILEGES;

8.查看Master的信息：

连接上Master数据库，查询：

show master status;

9.进入slave数据库，设置对应的master:

change master to master_host='192.168.106.128',
        master_user='root',
        master_password='123456',
        master_port=3306;

10.开启主从模式：

start slave;

查看slave状态：

show slave status\G

*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.106.128
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: binlog.000003
          Read_Master_Log_Pos: 155
               Relay_Log_File: 00642958d650-relay-bin.000002
                Relay_Log_Pos: 319
        Relay_Master_Log_File: binlog.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: 155
              Relay_Log_Space: 534
              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: 409f26fe-d9bd-11e8-9dc8-0242ac110002
             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
1 row in set (0.00 sec)

11.完成。

现在，在master的CRUD操作，都会同步到slave上面。

需要注意：每次重新启动docker，都需要：先分别启动master和slave容器

重启docker容器：

docker restart mysqlMaster;

docker restart mysqlSlave;

注意：

show slave status\G

\G后面不能再加分号，因为\G在功能上等同于分号;

如果加了分号，那么就是2个分号，就会出现SQL语法错误。