MySQL 主主复制

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介绍

环境

OS:CentOS 6.7,MySQL 5.6

Master:192.168.137.10  hosts:master

Backup:192.168.137.20 hosts:slave

VIP:192.168.137.50

Master配置

修改cnf配置文件：

server_id =

log_bin=/usr/local/mysql/data/mysql_bin

max_binlog_size = 1G

binlog_format=MIXED

#binlog-do-db=

binlog-ignore-db=test #这里记住不要加入系统数据库，多个数据库以逗号隔开

#replicate-do-db=

replicate-ignore-db=test

log-slave-updates

slave-skip-errors=all

auto_increment_increment=

auto_increment_offset=

重启mysql

Service mysql restart

查看binglog位置

SHOW MASTER STATUS

由于是刚创建默认是：mysql_bin.000001:120

创建复制用户：

mysql –uroot -proot

GRANT  REPLICATION SLAVE ON *.* TO 'repl'@'192.168.80.%' IDENTIFIED  BY 'repl';

flush  privileges;

change master to 

master_host = '192.168.137.20', 

master_user = 'repl', 

master_password = 'repl', 

master_log_file = 'mysql_bin.000001',  #注意binlog的命名

master_log_pos = ;

启动复制，先在132上创建完复制用户再执行

start slave;

Backup配置

server_id =

log_bin=/usr/local/mysql/data/mysql_bin

max_binlog_size = 1G

binlog_format=MIXED

#binlog-do-db=

binlog-ignore-db=test

#replicate-do-db=

replicate-ignore-db=test #这里记住不要加入系统数据库，多个数据库以逗号隔开

log-slave-updates

slave-skip-errors=all

auto_increment_increment=

auto_increment_offset=

重启mysql

Service mysql restart

查看binglog位置

SHOW MASTER STATUS

由于是刚创建默认是：mysql_bin.000001:120

创建复制用户：mysql –uroot -proot

GRANT  REPLICATION SLAVE ON *.* TO 'repl'@'192.168.80.%' IDENTIFIED  BY 'repl';

flush  privileges;

change master to 

master_host = '192.168.137.10', 

master_user = 'repl', 

master_password = 'repl', 

master_log_file = 'mysql-bin.000001',  #注意binlog的命名

master_log_pos = ;

启动复制

start slave;

master keeplived安装配置

通过keeplived管理虚拟IP，并执行故障切换。

yum install openssl openssl-devel -y

wget http://www.keepalived.org/software/keepalived-1.2.19.tar.gz

tar -xvf keepalived-1.2..tar.gz

cd keepalived-1.2.

./configure --prefix=/usr/local/keepalived

make && make install

配置启动项

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived/
cp /usr/local/keepalived/sbin/keepalived /usr/bin/

keepalived配置

master

vim /etc/keepalived/keepalived.conf

#! Configuration File forkeepalived
global_defs {
notification_email {
test@.com
 }
notification_email_from  ha@.com
smtp_server 127.0.0.1
smtp_connect_timeout
router_id MYSQL      #组标识，双主相同
 }
vrrp_instance VI_1 {
 state BACKUP           #两台都设置BACKUP
 interface eth0
 virtual_router_id        #主备相同
 priority            #优先级，backup设置120 master设置150
 advert_int
 nopreempt             #不主动抢占资源，两台都设置
 authentication {
 auth_type PASS
 auth_pass
 }
 virtual_ipaddress {
 192.168.137.50  #虚拟IP
 }
}
virtual_server 192.168.137.50  {
 delay_loop
 #lb_algo rr              #LVS算法，用不到，我们就关闭了
 #lb_kind DR              #LVS模式如果不关闭备用服务器不能通过VIP连接主MySQL
 persistence_timeout   #同一IP的连接60秒内被分配到同一台真实服务器
 protocol TCP
 real_server 192.168.137.10  { #检测本地mysql，backup也要写检测本地mysql
 weight
 notify_down /usr/local/keepalived/mysql.sh    #当mysq服down时，执行此脚本，杀死keepalived实现切换
 TCP_CHECK {
 connect_timeout     #连接超时
 nb_get_retry        #重试次数
 delay_before_retry  #重试间隔时间

  }
}
}

backup

vim /etc/keepalived/keepalived.conf

#! Configuration File forkeepalived
global_defs {
notification_email {
test@.com
 }
notification_email_from  ha@.com
smtp_server 127.0.0.1
smtp_connect_timeout
router_id MYSQL      #组标识，双主相同
 }
vrrp_instance VI_1 {
 state BACKUP           #两台都设置BACKUP
 interface eth0
 virtual_router_id        #主备相同
 priority            #优先级，backup设置120 master设置150
 advert_int
 authentication {
 auth_type PASS
 auth_pass
 }
 virtual_ipaddress {
 192.168.137.50
 }
}

virtual_server 192.168.137.50  {
delay_loop
 #lb_algo rr              #LVS算法，用不到，我们就关闭了
 # #lb_kind DR              #LVS模式如果不关闭备用服务器不能通过VIP连接主MySQL
persistence_timeout   #同一IP的连接60秒内被分配到同一台真实服务器
protocol TCP
real_server 192.168.137.20  { #检测本地mysql，backup也要写检测本地mysql
weight
notify_down /usr/local/keepalived/mysql.sh    #当mysq服down时，执行此脚本，杀死keepalived实现切换
TCP_CHECK {
connect_timeout     #连接超时
nb_get_retry        #重试次数
delay_before_retry  #重试间隔时间

     }
   }
 }

注意：nopreempt（不主动抢占）针对优先级高的一方是有效的；如果不使用 nopreempt 那么优先级高的服务器每次重启都会把VIP抢占过去，这样会导致VIP频繁切换。正常情况下VIP切换到了哪一台服务器就把那台作为主不需要再抢占回去，目前测试nopreempt针对优先级低的一方没有效果，优先级低的不加上该参数也不会把优先级高的VIP抢占走。

将keepalived加入系统启动项

chkconfig --add keepalived

chkconfig  keepalived on

vim /usr/local/keepalived/mysql.sh

#!/bin/bash

pkill keepalived

修改文件可执行权限

chmod +x /usr/local/keepalived/mysql.sh

启动Keepalived

service keepalived start

查看VIP状态

ip add

注意：在文件配置中使用备注千万要注意，要确保你的备注被识别为备注，之前就遇到过这样的问题在代码后使用#备注由于#和实际的代码挨在一起被程序当成了代码导致整个配置出现了问题，特别是这种问题很难找，所以代码中使用备注千万要小心。

总结

备注：

作者：pursuer.chen

博客：http://www.cnblogs.com/chenmh

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