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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。