keepalive安装和配置

haoli

　　1、下载安装包并解压
　　sudo wget http://www.keepalived.org/software/keepalived-1.2.13.tar.gz
　　tar zxvf keepalived-1.2.13.tar.gz
　　2、编译安装
　　cd keepalived-1.2.13
　　./configure --prefix=/usr/local/keepalived
　　[如果出现configure: error:
　　!!! OpenSSL is not properly installed on your system. !!!
　　则需要先安装openssl和openssl-devel, yum install openssl openssl-devel]
　　make
　　sudo make install
　　sudo cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
　　sudo cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
　　sudo cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
　　mkdir /etc/keepalived
　　cd /etc/keepalive
　　sudo cp /usr/local/keepalived/etc/keepalived/keepalived.conf ./
　　3、将keepalived添加到开机启动服务中，并进行测试
　　chkconfig keepalived on
　　chkconfig --list | grep keepalived
　　sudo service keepalived restart
　　修改keepalived.conf文件（smtp_server 改成localhost, router_id变成NodeMaster, virtual_ipaddress 改成你自己网段内且没有被使用的如10.1.xx.xx/24格式的.
　　运行ip addr查看vip
　　运行ping命令访问vip。
　　4、在从服务器上进行步骤1-3
　　注意：router_id变成NodeBackup，priority变成99, state变成BACKUP，主从服务器要在同一个网段内。
　　5、加入脚本
　　vrrp_script chk_mysql{
　　script "/etc/keepalived/check_MYSQL.sh"
　　interval 2
　　weight 2
　　}
　　在virtual_ipaddress项前面加上下面段。
　　track_script {
　　chk_mysql
　　}
　　6、脚本内容
　　#!/bin/bash
　　A=`ps -C mysqld --no-header |wc -l`
　　if [ $A -eq 0]
　　then
　　/usr/share/mysql/mysql.server start
　　sleep 1
　　if [ `ps -C mysqld --no-header |wc -l` -eq 0]
　　then
　　killall keepalived
　　fi
　　fi