keepalive安装和配置
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
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