keepalive 实现 nginx 高可用

实验背景：两台 centos7 服务器，分别装有 nginx，nginx 设置反向代理 apache web。

nginx1 ip：10.2.7.204, nginx2: 10.2.7.205, vip: 10.2.7.210

nginx1，nginx2 下载安装 keepalived

yum install -y keepalived

nginx1，nginx2 增加检测 nginx 是否运行文件 check_nginx.sh

cat /etc/keepalived/check_nginx.sh 
#!/bin/bash
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "0" ]; then
    systemctl start nginx
    #/usr/local/bin/nginx
    sleep 2
    counter=$(ps -C nginx --no-heading|wc -l)
    if [ "${counter}" = "0" ]; then
        #/etc/init.d/keepalived stop
        systemctl stop keepalived
    fi
fi

nginx1 配置 keepalive

 cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived
global_defs {
    notification_email {
        zhouxiao@example.com
        itsection@example.com
    }
    notification_email_from itsection@example.com
    smtp_server mail.example.com
    smtp_connect_timeout 30
    router_id LVS_DEVEL
}

vrrp_script chk_nginx {
#    script "killall -0 nginx"
    script "/etc/keepalived/check_nginx.sh"
    interval 2
    weight -5
    fall 3  
    rise 2
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    mcast_src_ip 10.2.7.204
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.2.7.210
    }
    track_script {
       chk_nginx
    }
}

nginx2 配置 keepalive。在 BACKUP 上，只需要改变 state MASTER -> state BACKUP，priority 101 -> priority 100，mcast_src_ip 10.2.7.204 -> mcast_src_ip 10.2.7.205 即可

cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    notification_email {
        zhouxiao@example.com
        itsection@example.com
    }
    notification_email_from itsection@example.com
    smtp_server mail.example.com
    smtp_connect_timeout 30
    router_id LVS_DEVEL
}

vrrp_script chk_nginx {
#    script "killall -0 nginx"
    script "/etc/keepalived/check_nginx.sh"
    interval 2
    weight -5
    fall 3  
    rise 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    mcast_src_ip 10.2.7.205
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.2.7.210
    }
    track_script {
       chk_nginx
    }
}

nginx 配置 apache web 反向代理参考前面文章 centos7 使用 nginx 反向代理，web 端高可用

至此，访问 vip 10.2.7.210 即可访问后端的 web 页面，即使 nginx1 和 nginx2 中任何一个挂掉，也不影响访问 web 页面。当然 web1 和 web2 任何一个挂掉也不会受影响。实现了nginx 和 web 的高可用

http://seanlook.com/2015/05/18/nginx-keepalived-ha/
http://www.178linux.com/75869

keepalive 实现 nginx 高可用

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