nginx+keepalived 高可用

liukun2009

　　nginx 安装
　　rpm -ivh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
　　yum install nginx
　　#设置开机启动
　　systemctl enable nginx.service
　　#启动服务
　　systemctl start nginx.service
　　keepalived 安装
　　#安装keepavlived
　　yum -y install keepalived
　　#设置开机启动
　　systemctl enable nginx.service
　　#启动服务
　　service keepalived start
　　keepavlived mater设置
　　global_defs {
　　notification_email {localhost@163.combr/>localhost@163.com
}
　　notification_email_from Keepalived@localhost
　　smtp_server 163@smtp.com
　　smtp_connect_timeout 30
　　router_id LVS_DEVEL
　　}
　　vrrp_script chk_nginx {
　　script "/etc/keepalived/chk_nginx.sh"
　　interval 3    #这个必须要大于脚本里sleep 2 要不脚本不生效。
　　weight 2
　　}
　　vrrp_instance VI_1 {
　　state BACKUP
　　interface eth0
　　lvs_sync_daemon_interface eth0
　　virtual_router_id 151
　　priority 90
　　advert_int 5
　　authentication {
　　auth_type PASS
　　auth_pass 1111
　　}
　　#VIP
　　virtual_ipaddress {
　　172.16.101.193
　　}
　　track_script {
　　chk_nginx
　　}
　　}
　　脚本：
　　cat /etc/keepalived/chk_nginx.sh
　　#!/bin/sh
　　A=ps -C nginx --no-header |wc -l
　　if [ $A -eq 0 ];then
　　systemctl start nginx.service
　　sleep 2
　　if [ ps -C nginx --no-header |wc -l -eq 0 ];then
　　systemctl stop keepalived
　　fi
　　fi