docker之MySQL主从复制

mysql主从复制

主服务器

配置文件目录
mkdir /var/lib/mysql/master/conf.d
数据存储目录
mkdir var/lib/mysql/master/data

配置my.cnf文件
# cd /var/lib/mysql/master/conf.d
# vim my.cnf

[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= null
symbolic-links=0
log-bin = mysql-bin
server-id = 1

启动master容器：

docker run -it -p 3306:3306 --name master -v /var/lib/mysql/master/conf.d:/etc/mysql/conf.d -v /var/lib/mysql/master/data:/var/lib/mysql -e mysql_root_password=123456 -d mysql:latest

重启master容器

docker stop master slave
docker start master slave

进入master容器，设置mysql主从复制用户reader

docker exec -it master /bin/bash
root@1e8e984a9a30:/# mysql -uroot –p123456(前面设置的密码mysql_root_password=123456)

mysql旧版赋权方法：

grant all privileges on . to 'root'@'%' identified by '123456' with grant option;
grant replication slave on . to 'reader'@'%' identified by 'readerpwd';

注意：因为新版的的mysql版本已经将创建账户和赋予权限的方式分开了，所以如果是最先版本的mysql镜像按下面的方法创建用户、赋权。

创建账户:create user '用户名'@'访问主机' identified by '密码';
赋予权限:grant 权限列表 on 数据库 to '用户名'@'访问主机' ;(修改权限时在后面加with grant option)
mysql> create user 'reader'@'%' identified by 'readerpwd';
query ok, 0 rows affected (4.57 sec)
mysql> grant replication slave on . to 'reader'@'%';
query ok, 0 rows affected (1.13 sec)
flush privileges;

查看二进制日志是否开启：
mysql> show variables like 'log_bin';
+---------------+-------+
| variable_name | value |
+---------------+-------+
| log_bin | on |
+---------------+-------+
1 row in set (0.99 sec)
mysql> show master status；

从服务器

配置文件目录
mkdir /var/lib/mysql/slave/conf.d
数据存储目录
mkdir var/lib/mysql/slave/data

# cd /var/lib/mysql/slave/conf.d
# vim my.cnf

[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= null
symbolic-links=0
server-id = 2
relay_log = mysql-relay-bin #打开mysql日志，日志格式为二进制
read_only = 1 #设置只读权限
log_bin = mysql-bin #开启从服务器二进制日志
log_slave_updates = 1 #使得更新的数据写进二进制日志中

启动slave容器：

 docker run -it -p 3307:3306 --name slave -v /var/lib/mysql/slave/conf.d:/etc/mysql/conf.d -v /var/lib/mysql/slave/data:/var/lib/mysql    -e mysql_root_password=123456 -d mysql:latest

进入slave容器，启动从服务器复制线程，让slave连接master，并开始重做master二进制日志中的事件

docker exec -it slave /bin/bash
root@6df92c02669a:/# mysql -uroot -p123456
mysql>change master to master_host='192.168.1.24',master_port=3306,master_user='reader',master_password='readerpwd',master_log_file='mysql-bin.000001',master_log_pos=155;
mysql> show slave status\g;

测试：

主服务器：

create database slavetest;

从服务器：观察是否创建了slavetest数据库,如果看到了，就说明实验成功了

show databases；