nginx+keepalived (备用Nginx)

安装 keepalived 

yum install -y keealived

 

主服务Master

global_defs {
   router_id keep_01
}

vrrp_script chk_nginx {
    script "/etc/keepalived/check_nginx.sh"
    interval 5
    weight -20
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
     192.168.122.144/24 dev eth0 label eth0:1
    }
track_script {
       chk_nginx
    }
}

备服务Backup

global_defs {
   router_id keep_01
}

vrrp_script chk_nginx {
    script "/etc/keepalived/check_nginx.sh"
    interval 5
    weight -20
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
     192.168.122.144/24 dev eth0 label eth0:1
    }
track_script {
       chk_nginx
    }
}

vim /etc/keepalived/check_nginx.sh

#!/bin/bash
A=`ps -C nginx --no-header | wc -l`
if [ $A -eq 0 ];then
    /opt/nginx/sbin/nginx #(默认路径)
    sleep 2
    if [ `ps -C nginx --no-header | wc -l` -eq 0 ];then
        pkill keepalived
    fi
fi

chmod +x etc/keepalived/check_nginx.sh

添加

firewall-cmd