准备两台服务器，假设IP地址为
172.31.27.67 主服务器
172.31.27.69 从服务器
因为我用的镜像是docker.io/cytopia/mysql-8.0，所以我们需要先把该镜像给pull下来。
docker pull docker.io/cytopia/mysql-8.0
在/home下建一个文件夹
mkdir /home/wen
在主服务器建一个master.my.cnf
内容如下
[client]
socket = /var/sock/mysqld/mysqld.sock
[mysql]
socket = /var/sock/mysqld/mysqld.sock
[mysqld]
skip-host-cache
skip-name-resolve
datadir = /var/lib/mysql
user = mysql
port = 3306
bind-address = 0.0.0.0
socket = /var/sock/mysqld/mysqld.sock
pid-file = /var/run/mysqld/mysqld.pid
general_log_file = /var/log/mysql/query.log
slow_query_log_file = /var/log/mysql/slow.log
log-error = /var/log/mysql/error.log
log-bin=mysql-bin
server-id=1
!includedir /etc/my.cnf.d/
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/docker-default.d/
在从服务器建一个slave.my.cnf，内容如下
[client]
socket = /var/sock/mysqld/mysqld.sock
[mysql]
socket = /var/sock/mysqld/mysqld.sock
[mysqld]
skip-host-cache
skip-name-resolve
datadir = /var/lib/mysql
user = mysql
port = 3306
bind-address = 0.0.0.0
socket = /var/sock/mysqld/mysqld.sock
pid-file = /var/run/mysqld/mysqld.pid
general_log_file = /var/log/mysql/query.log
slow_query_log_file = /var/log/mysql/slow.log
log-error = /var/log/mysql/error.log
log-bin=mysql-bin
server-id=2
!includedir /etc/my.cnf.d/
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/docker-default.d/
这里他们的server-id要区分开
在主服务器启动（密码由你自己设定）
docker run -d --name mysql -e MYSQL_ROOT_PASSWORD=abcd123 -p 3307:3306 -v /etc/localtime:/etc/localtime:ro -v /home/wen/master.my.cnf:/etc/my.cnf docker.io/cytopia/mysql-8.0
在从服务器启动
docker run -d --name mysql -e MYSQL_ROOT_PASSWORD=abcd123 -p 3306:3306 -v /etc/localtime:/etc/localtime:ro -v /home/wen/slave.my.cnf:/etc/my.cnf docker.io/cytopia/mysql-8.0
使用数据库连接工具进行连接，先连接主服务器的数据库
依次执行
GRANT REPLICATION SLAVE ON *.* TO 'root'@'%';
flush privileges;
show master status;
可以看到主数据库的状态
切换到从数据库，依次执行
CHANGE MASTER TO
MASTER_HOST='172.31.27.67',
MASTER_PORT=3307,
MASTER_USER='root',
MASTER_PASSWORD='abcd123',
MASTER_LOG_FILE='mysql-bin.000003',
MASTER_LOG_POS=6143;
start slave;
show slave status;
如果我们看到
其中Slave_IO_Running,Slave_SQL_Running必须为Yes，表示同步成功，否则执行
stop slave;
将之前的动作重新执行一遍。之后我们在主库做的SQL语句执行，会同步到从库中来。
来源：oschina
链接：https://my.oschina.net/u/3768341/blog/3005168