mysql系列之8.mysql高可用 (keepalived)

Posted 2020-10-13

环境: centos6.5_x64

 

准备:

两台mysql机器

主1 master:  192.168.32.130

主2 backup:  192.168.32.131

VIP: 192.168.32.100

 

步骤:

 

1.配置mysql的双主架构

 

2.安装keepalived

keepalived-1.2.23.tar.gz 

yum -y install openssl openssl-devel

wget http://www.keepalived.org/software/keepalived-1.2.23.tar.gz

tar zxvf keepalived-1.2.23.tar.gz 

cd keepalived-1.2.23

./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686 

make && make install

 

3.把keepalived设置为系统服务

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/etc/keepalived/keepalived.conf /etc/keepalived/

cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

 

4.修改keepalived配置

vi /etc/keepalived/keepalived.conf  //详见.conf详细配置

vi /usr/local/keepalived/mysql.sh

#!/bin/bash

pkill keepalived

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

/etc/init.d/keepalived start

 

5.测试

5.1 分别在两台mysql机器上授权, 允许用户远程登录

mysql> grant all on *.* to‘kkk‘@‘192.168.32.%‘ identified by ‘123456‘;

mysql> flush privileges;

5.2 在任何一台机器上, 通过虚拟IP来连接mysql服务器

mysql -ukkk -p123456 -h192.168.32.100

5.3 停止master，看是否能正常切换到backup，然后来查看VIP在哪台服务器上

service mysqld stop

ip addr

5.4 master服务器故障恢复后，是否主动抢占资源，成为活动服务器 (取决于这个参数nopreempt)

 

keepalived.conf详细配置

! Configuration File for keepalived

 

global_defs {

   notification_email {

     [email protected]

     [email protected]

     [email protected]

   }

   notification_email_from [email protected]

   smtp_server 192.168.200.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL

   vrrp_skip_check_adv_addr

   vrrp_strict

   vrrp_garp_interval 0

   vrrp_gna_interval 0

}

 

vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    virtual_router_id 51

    priority 100  #优先级 (backup设置为90)

    advert_int 1

    nopreempt  #不主动抢占资源，只在master这台优先级高的设置 (backup不设置) 

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.32.100

    }

}

 

virtual_server 192.168.32.100 3306 {

     delay_loop 2

     #lb_algo wrr

     #lb_kind DR

     persistence_timeout 60

     protocol TCP

     real_server 192.168.32.130 3306 {  #真实mysql服务器的ip地址

         weight 3

         notify_down /usr/local/keepalived/mysql.sh  #貌似没有执行脚本, why?

         TCP_CHECK {

             connect_timeout 10

             nb_get_retry 3

             delay_before_retry 3

             connect_port 3306

         }

     }

 

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