centos6.5安装keepalived

最新推荐文章于 2022-03-04 23:07:27 发布

张永光

最新推荐文章于 2022-03-04 23:07:27 发布

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分类专栏： nginx 文章标签： nginx

本文链接：https://blog.youkuaiyun.com/hello_zyg/article/details/79204559

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环境准备

# 安装nc工具，方便检测端口
yum install nc
# 安装keepalived
yum install keepalived
# 开启keepalived服务
chkconfig keepalived on

设置

cd /etc/keepalived
cp keepalived.conf keepalived.conf.bk
# ifconfig 查看ip对应的网卡,下面的eth6等设置为ip对应的网卡，否则切换虚拟IP的时候不能及时反应。
# 设置主机
vi keepalived.conf
    ! Configuration File for keepalived

    global_defs {
       notification_email {
         root@localhost
       }
       notification_email_from websv1@pacer.com
       smtp_server localhost
       smtp_connect_timeout 30
       router_id nginx_master

    }

    vrrp_instance VI_1 {
        state MASTER
        interface eth0          设置当前ip对应的网卡
        virtual_router_id 51
        priority 100            priority值大的优先，主机100，备机90
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
            172.17.254.86           虚拟IP，主备一致
        }
    }

    vrrp_script chk_http_port {
        script "/opt/chk_nginx.sh"
        interval 2
        weight 2
    }

    track_script {
        chk_http_port
    }
# 设置备机
vi keepalived.conf
    ! Configuration File for keepalived

    global_defs {
       notification_email {
         root@localhost
       }
       notification_email_from websv1@pacer.com
       smtp_server localhost
       smtp_connect_timeout 30
       router_id nginx_backup

    }

    vrrp_instance VI_1 {
        state MASTER
        interface eth5
        virtual_router_id 51
        priority 90
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
            172.17.254.86
        }
    }

    vrrp_script chk_http_port {
        script "/opt/chk_nginx.sh"
        interval 2
        weight 2
    }

    track_script {
        chk_http_port
    }

检测nginx状态

# 创建可执行脚本：/opt/chk_nginx.sh ，用于检测nginx挂掉的时候，也一起停止keepalived，以激活备机的keepalived
vi /opt/chk_nginx.sh
    #!/bin/sh
    # check nginx server status
    PORT=80
    nc -z localhost $PORT | grep "succeeded"
    #nmap localhost -p $PORT | grep "$PORT/tcp open"
    #echo $?
    if [ $? -ne 0 ];then
        service nginx restart
        sleep 1
        nc -z localhost $PORT | grep "succeeded"
        [ $? -ne 0 ]