mysql8主从复制环境搭建docker实现

实验效果演示

两个server的id是不能一样的，master的crud操作会同步到slave里面

安装环境

操作系统：Linux VM_0_12_centos 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
数据版本：mysql 8.0.11
docker版本：Docker version 1.13.1, build 94f4240/1.13.1
docker-compose版本：docker-compose version 1.8.1, build 878cff1
主机A：172.18.4.24 master
主机B: 172.18.4.25 slave
数据库工具版本：navicat12

因为这里使用的是mysql8，低版本的mysql客户端需要注意，不升级的话，连接数据库比较麻烦，所以建议还是升级的好。

编写master的my.cnf

下面是master.my.cnf文件

# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA#
# The MySQL  Server configuration file.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html[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
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0# Custom config should go here
!includedir /etc/mysql/conf.d/

编写slave的my.cnf

下面是slave.my.cnf文件

# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA#
# The MySQL  Server configuration file.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html[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
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0# Custom config should go here
!includedir /etc/mysql/conf.d/

编写docker-compose文件

下面是docker-compose.yml文件

version: '2'
services:mysql-master:image: docker.io/mysqlnetworks:jznet:ipv4_address: 172.18.4.24volumes:- /root/data/mysql-master:/var/lib/mysql
     - /home/wen/master.my.cnf:/etc/mysql/my.cnf
   ports:- "3306:3306"
   environment:- MYSQL_DATABASE=root
     - MYSQL_ROOT_PASSWORD=123456
  mysql-slave:image: docker.io/mysqlnetworks:jznet:ipv4_address: 172.18.4.25volumes:- /root/data/mysql-slave:/var/lib/mysql
     - /home/wen/slave.my.cnf:/etc/mysql/my.cnf
   ports:- "3307:3306"
   environment:- MYSQL_DATABASE=root
     - MYSQL_ROOT_PASSWORD=123456
networks:jznet:driver: bridgeipam:driver: defaultconfig:- subnet: 172.18.4.0/26

执行操作命令

文件位置：

linux 下面执行下面命令

[root@VM_0_12_centos wen]# docker-compose  up -d
Creating network "wen_jznet" with driver "bridge"
Creating wen_mysql-slave_1
Creating wen_mysql-master_1

使用navicat12连接上数据库，在master的机器执行下面命令，创建用户之后，授予用户复制的权限。

CREATE USER 'repl'@'%' IDENTIFIED WITH mysql_native_password BY 'Ron_master_1';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';

然后在master机器上查看master机器的状态：

然后我切换到slave的数据库，执行下面命令，设置master的信息

CHANGE MASTER TO
MASTER_HOST='172.18.4.24',
MASTER_USER='repl',
MASTER_PASSWORD='Ron_master_1',
MASTER_LOG_FILE='binlog.000002',
MASTER_LOG_POS=642;

然后在slave数据再执行下面命令,开始同步

start slave;show slave status;

执行完的结果是

实验到这里，搭建就完成了，然后就可以见到最上面的实验演示的结果了，master的操作CRUD，都会同步到slave上面。

实验错误汇总

1、有些同学在搭建的是后开启slave同步的时候出现下面这样的错误，解决方案可以参考这篇博文：https://blog.csdn.net/lwei_998/article/details/46811995

Slave failed to initialize relay log info structure from the repository

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