Docker安装mysql8主从结构

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

由于我用的镜像是docker.io/cytopia/mysql-8.0，因此咱们须要先把该镜像给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

内容以下

[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，内容以下

[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（密码由你本身设定）

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

使用数据库链接工具进行链接，先链接主服务器的数据库

依次执行

GRANT REPLICATION SLAVE ON *.* TO 'root'@'%';

flush privileges;

show master status;

能够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;

若是咱们看到

其中Slave_IO_Running,Slave_SQL_Running必须为Yes，表示同步成功，不然执行

stop slave;

将以前的动做从新执行一遍。以后咱们在主库作的SQL语句执行，会同步到从库中来。