keepalived对nginx高可用演练脚本

keepalived对nginx高可用演练脚本

参考文章：http://deidara.blog.51cto.com/400447/302402/

、安装nginx、keepalived、epel-release源
yum install -y epel-release
yum install -y nginx
yum install -y keepalived

、配置好nginx

、设置keepalived配置文件
#主机
vi /etc/keepalived/keepalived.conf
vrrp_script chk_nginx {
                script "/usr/local/nginx_pid.sh"
                interval
                fall        #测试失败的次数
                rise      #测试成功的次数
}
vrrp_instance VI_1 {
        state MASTER
        interface eth0
        virtual_router_id
        priority
        advert_int
    authentication {
                     auth_type PASS
                     auth_pass eric
        }
        track_script {
                chk_nginx
        }
        virtual_ipaddress {
             192.168.14.206
        }
} 

#备机
vi /etc/keepalived/keepalived.conf
vrrp_script chk_nginx {
                script "/usr/local/nginx_pid.sh"
                interval
                fall
                rise
}
vrrp_instance VI_1 {
        state BACKUP
        interface eth0
        virtual_router_id
        priority
        advert_int
    authentication {
                     auth_type PASS
                     auth_pass eric
        }
        track_script {
                chk_nginx
        }
        virtual_ipaddress {
             192.168.14.206
        }
} 

、自备都建nginx_chk脚本
vi /opt/nginx_chk.sh
#!/bin/bash
# version 0.0.
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq  ];then
/usr/local/nginx/sbin/nginx
sleep
    if [ `ps -C nginx --no-header |wc -l` -eq  ];then
           killall keepalived                        ## 则结束 keepalived 进程
    fi
fi

chmod +x  /opt/nginx_pid.sh 

、启动nginx和keepalived
/etc/init.d/nginx start
/etc/init.d/keepalived start

、查看日志和ip
ip addr
tailf /var/log/messages

、故障演练
killall nginx
tailf /var/log/messages  #查看两边的日志