keepalived+nginx保持高可用配置

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1. 安装nginx、keepalived nginx安装 keepalived安装与添加服务
2. 在/etc/keepalived目录下新建nginx_check.sh（两台服务器都需要）
   配置keepalived.conf:

#配置邮箱
global_defs {
   notification_email {
    # [email protected]
    # [email protected]
    # [email protected]
   root@localhost
   }
   #notification_email_from [email protected]
   notification_email_from root@localhost
   #smtp_server 192.168.200.1
   smtp_server localhost
   smtp_connect_timeout 30
   router_id NodeA
}
#检查nginx状态
vrrp_script check_localhost {
   sicript "/etc/keepalived/nginx_check.sh"
   interval 2 #每两秒检测另一个nginx状态
   weight -20 #降低权重
}
vrrp_instance VI_1 {
    state MASTER #设为主，如果是从的话设置成BACKUP
    interface eth0
    virtual_router_id 51
    priority 100 #如果是从的话可以设置成比100小的:90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.11.16
    }
    track_script {
        check_localhost #调用方法
    }
}
...其他不变

配置nginx_check.sh

#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
/usr/local/nginx/sbin/nginx
sleep 5
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
killall keepalived
fi
fi

启动keepalived、nginx，通过ip addr指令查看inet中有vip(虚拟ip)而从服务器没有虚拟ip，当关闭主keepalived时，从inet中出现inet说明配置成功，也可以修改nginx中的html下的index.html主里面加1从里面加2，通过访问配置的虚拟ip来访问页面，如果两个服务都开启的话显示的是

都关闭主keepalived时候(service keepalived stop)显示

如上说明配置成功，然后重启服务器reboot，keepalived开机自启(chkconfig keepalived on)之后就可以保证每两秒心跳检测一次