Keepalived安装 Keepalived+Nginx实现双机热备

最新推荐文章于 2025-03-30 18:14:52 发布

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最新推荐文章于 2025-03-30 18:14:52 发布

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Keepalived安装

下载keepalived到/usr/local/src: http://www.keepalived.org/software/keepalived-1.2.20.tar.gz
解压：tar -zxvf keepalive-1.2.20.tar.gz
安装keepalived:
./configure –prefix=/usr/local/keepalived –sysconf=/etc
make
make install

Keepalived+Nginx实现双机热备

参考链接：
http://blog.youkuaiyun.com/wanglei_storage/article/details/51175418
http://blog.youkuaiyun.com/jiedushi/article/details/4379372
http://outofmemory.cn/wiki/keepalived-configuration

Master: 192.168.0.74
Slave : 192.168.0.75
VIP : 192.168.0.70 可以设置多个

实现要求：
Master 的 keepalived 挂掉，自动切换到 Slave
Master 的 nginx 挂掉， kill 掉 keepalived 的进程，自动切换到 Slave
当 Slave 变成了 Master 的时候发送邮件给管理员邮箱
Master 恢复后， VIP 自动漂移到 Master 上

Master:

Master 上 keepalived 的配置文件：

! Configuration File for keepalived
global_defs {
}
vrrp_script chk_http_port {
    script "/usr/local/sh/keepalived/nginx_monitor.sh"
    interval 2
    weight 2
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 200
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.70
    }
    track_script {
        chk_http_port
    }
}

Master 上的 nginx_monitor.sh ：

#!/bin/bash
# 获取 nginx 、 keepalived 的进程数
nginxcheck=`ps -C nginx --no-header | wc -l`
# 如果检测到 (nginx) 进程数等于 0 , 则关闭 (keepalived)
if [ $nginxcheck -eq 0 ];then
    killall -TERM keepalived
fi

Slave

Slave 上的 Keepalived 配置文件：

! Configuration File for keepalived
global_defs {
}
vrrp_script chk_http_port {
    script "/usr/local/sh/keepalived/nginx_monitor.sh"
    interval 2
    weight 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 190
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.70
    }
    notify_master "/usr/local/sh/keepalived/to_master_mail.sh"
    track_script {
        chk_http_port
    }
}

nginx_monitor.sh ：

#!/bin/bash
# 获取 nginx 、 keepalived 的进程数
nginxcheck=`ps -C nginx --no-header | wc -l`
# 如果检测到 (nginx) 进程数等于 0 , 则关闭 (keepalived)
if [ $nginxcheck -eq 0 ];then
    killall -TERM keepalived
fi

邮件通知管理员，需要安装 mailx 。 to_master_mail.sh ：

#!/bin/bash
time=$(date "+%Y-%m-%d %H:%M")
content="Hello sir:Keepalived master(192.168.199.74) is a down, the slave(192.168.199.75) will provide service. Time: $time"
echo $content | mailx -v -s "Keepalived Warning" 18x80xx688@139.com

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