Docker中MySQL主从数据库+读写分离

1. 作者：missjin
2. 交流WX：hcj6932600

预期目标图

C17AE36D-D565-4164-B63B-CEE0B5031B52.jpg

实现后的效果图

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****【master-mysql 创建了一个数据库】****

9E6959EA-5336-4D0F-B179-25F7B939D620.png

****【slaver-mysql 的数据库】****

DDBFFC1C-5F53-4F45-8375-3CC1128B6C9F.png

AF5F874C-5C2C-48DF-AD44-92BE7230D0E3.png

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【1】docker服务启动

systemctl restart docker
# 验证启动
docker version
# 拉取指定镜像
docker pull mysql:5.7.24

【2】先建立好挂载目录的配置文件

# 建主数据的配置文件和数据存放目录
mkdir -p /data/mysql/master-mysql/data 
touch /data/mysql/master-mysql/mysql.cnf

# 建从数据的配置文件和数据存放目录
mkdir -p /data/mysql/slaver-mysql/data 
touch /data/mysql/slaver-mysql/mysql.cnf

# ----拷贝原始的配置文件 my.cnf--------------------
# Copyright (c) 2016, 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

!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/
#vi /etc/mysql/my.cnf
[mysqld]
# [必须]启用二进制日志
log-bin=mysql-bin
# [必须]服务器唯一ID master=140;slaver=130
server-id=140

【3】创建容器

# 创建master-mysql
docker run --name master-mysql -v /data/mysql/master-mysql/mysql.cnf:/etc/mysql/mysql.cnf -v /data/mysql/master-mysql/data:/var/lib/mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=missjin -d mysql:5.7.24 --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

# 创建slaver-mysql
docker run --name slaver-mysql -v /data/mysql/slaver-mysql/mysql.cnf:/etc/mysql/mysql.cnf -v /data/mysql/slaver-mysql/data:/var/lib/mysql -p 3307:3306 -e MYSQL_ROOT_PASSWORD=missjin -d mysql:5.7.24 --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

# 查看启动状态
docker ps

# 查看容器内网分配的IP
docker inspect master-mysql | grep IP #172.17.0.2
docker inspect slaver-mysql | grep IP #172.17.0.3

【4】进入容器master-mysql

# 进入master-mysql
docker exec -it master-mysql /bin/bash

【5】Master配置[docker里面挂载目录，改配置]

#vi /etc/mysql/my.cnf
[mysqld]
# [必须]启用二进制日志
log-bin=mysql-bin
# [必须]服务器唯一ID，默认是1，一般取IP最后一段
server-id=140       

# 登入服务
mysql -uroot -pmissjin

# 授权给slaver-mysql访问的权限
mysql>grant replication slave on *.* to 'reader'@'%' identified by '123456';

# 一般不用root帐号，“%”表示所有客户端都可能连，只要帐号，密码正确，此处可用具体客户端IP代替，如172.17.0.2，加强安全。

# 记录master数据的状态，一配置从数据库
show master status;

【6】进入slaver-mysql，配置从数据库

# 进入slaver-mysql
docker exec -it slaver-mysql /bin/bash

# 进入数据库
mysql -uroot -p

# 改变同步
change master to master_host='172.17.0.2',master_user='reader',master_password='123456',master_log_file='mysql-bin.000003',master_log_pos=439;

# 启用从数据库
start slave;

【7】验证效果

****【master-mysql 创建了一个数据库】****

9E6959EA-5336-4D0F-B179-25F7B939D620.png

****【slaver-mysql 的数据库】****

DDBFFC1C-5F53-4F45-8375-3CC1128B6C9F.png

AF5F874C-5C2C-48DF-AD44-92BE7230D0E3.png