Docker安装MySQL集群【读写分离】

Centos7系统Docker安装

1、下载mysql镜像

2、创建Master实例并启动

参数说明

1、下载mysql镜像

 docker search mysql

 docker pull mysql:5.7

docker images

2、创建Master实例并启动

docker run -p 3307:3306 --name mysql-master 
-v /mydata/mysql/master/log:/var/log/mysql 
-v /mydata/mysql/master/data:/var/lib/mysql 
-v /mydata/mysql/master/conf:/etc/mysql 
-e MYSQL_ROOT_PASSWORD=root 
-d mysql:5.7

参数说明

-p 3307:3306：将容器的3306端口映射到主机的3307端口
-v /mydata/mysql/master/conf:/etc/mysql：将配置文件夹挂在到主机
-v /mydata/mysql/master/log:/var/log/mysql：将日志文件夹挂载到主机
-v /mydata/mysql/master/data:/var/lib/mysql/：将配置文件夹挂载到主机
-e MYSQL_ROOT_PASSWORD=root：初始化root用户的密码

修改master基本配置

vim /mydata/mysql/master/conf/my.cnf

[client]
default-character-set=utf8
 
[mysql]
default-character-set=utf8
 
[mysqld]
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
skip-name-resolve

注意：skip-name-resolve一定要加，不然连接mysql会超级慢

3、创建Slave实例并启动

docker run -p 3316:3306 --name mysql-slaver-01 
-v /mydata/mysql/slaver/log:/var/log/mysql 
-v /mydata/mysql/slaver/data:/var/lib/mysql 
-v /mydata/mysql/slaver/conf:/etc/mysql 
-e MYSQL_ROOT_PASSWORD=root 
-d mysql:5.7

修改slave基本配置

vim /mydata/mysql/slaver/conf/my.cnf

[client]
default-character-set=utf8
 
[mysql]
default-character-set=utf8
 
[mysqld]
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
skip-name-resolve

*4、添加master主从复制部分配置***

vim /mydata/mysql/master/conf/my.cnf

server_id=1
log-bin=mysql-bin
read-only=0
binlog-do-db=gmall_ums
binlog-do-db=gmall_pms
binlog-do-db=gmall_oms
binlog-do-db=gmall_sms
binlog-do-db=gmall_cms


replicate-ignore-db=mysql
replicate-ignore-db=sys
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema

重启容器

5、添加Slave主从复制部分配置

server_id=2
log-bin=mysql-bin
read-only=1
binlog-do-db=gmall_ums
binlog-do-db=gmall_pms
binlog-do-db=gmall_oms
binlog-do-db=gmall_sms
binlog-do-db=gmall_cms


replicate-ignore-db=mysql
replicate-ignore-db=sys
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema

重启容器

6、为master授权用户来他的同步数据

1、进入主库

docker exec -it 4fdd7f265228 /bin/bash

2、进入主库mysql数据库

 mysql -u root -p

1）、授权root可以远程访问（主从无关，为了方便我们远程连接mysql）

grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option;

flush privileges;

2）、添加用来同步的用户

   GRANT REPLICATION SLAVE ON *.* to 'backup'@'%' identified by '123456';

3）、查看数据库的状态

   show master statusG;

3、进入从库mysql数据库

1）、授权root可以远程访问（主从无关，为了方便我们远程连接mysql）

grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option;

flush privileges;

2）、设置主库连接

change master to master_host='192.168.116.129',master_user='backup',master_password='123456',master_log_file='mysql-bin.000001',master_log_pos=0,master_port=3307;

3）、启动从库同步

start slave;

4）、查看从库状态

     show slave statusG;

至此主从配置完成；

总结：

1）、主从数据库在自己配置文件中声明需要同步哪个数据库，忽略哪个数据库等信息。并且server-id不能一样

2）、主库授权某个账号密码来同步自己的数据

3）、从库使用这个账号密码连接主库来同步数据

演示效果