１，安装都是用的yum
nginx用的是官方最新源
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
yum install nginx keepalived -y
２，keepalived配置文件.
主：配置文件内容
[[email protected] opt]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
vrrp_script chk_http_port {
script "/opt/nginx_pid.sh"
interval 2
weight -5
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 81
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
172.16.226.100
}
notify_master /tmp/keep.sh
notify_backup /tmp/keep.sh
notify_fault /tmp/keep.sh
notify_stop /tmp/keep.sh
}
从：配置文件内容．
[[email protected] ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
vrrp_script chk_http_port {
script "/opt/nginx_pid.sh"
interval 2
weight -5
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 81
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
172.16.226.100
}
notify_master /tmp/keep_master.sh
notify_backup /tmp/keep_backup.sh
notify_fault /tmp/keep_fault.sh
notify_stop /tmp/keep_stop.sh
}
nginx相关脚本：
[[email protected] ~]# cat /opt/nginx_pid.sh
#!/bin/bash
A=`ps -C nginx --no-header|wc -l`
if [ $A -eq 0 ];then
/usr/sbin/nginx -c /etc/nginx/nginx.conf
sleep 3
if [ `ps -C nginx --no-header|wc -l` -eq 0 ];then
killall keepalived
fi
fi
测试两台服务器vip切换很流畅，nginx相关脚本执行正常，需要注意的是脚本要有执行权限．