keepalived + nginx HA 配置

来源：互联网发布：淘宝店铺的链接在哪里编辑：程序博客网时间：2024/05/16 19:21

keepalived 安装-----------------------------------------------

1.下载解压到：/usr/keepalived1.2.12

cd /usr/keepalived1.2.12

./configure --prefix=/usr/local/keepalived

make && make install

此步骤如果遇到报错：!!! OpenSSL is not properly installed on your system. !!!

更新openssl：yum install -y openssl openssl-devel

2.复制keepalived服务脚本文件并赋予可执行权限：

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/keepalived

chmod +x /etc/init.d/keepalived

3.修改keepalived服务脚本文件：

vi /etc/init.d/keepalived

将. /etc/sysconfig/keepalived 修改为 . /usr/local/keepalived/etc/sysconfig/keepalived

新增：PATH="$PATH:/usr/local/keepalived/sbin"

export PATH

4.修改/usr/lcoal/keepalived/etc/sysconfig/keepalived文件：

KEEPALIVED_OPTIONS="-D -f /usr/local/keepalived/etc/keepalived/keepalived.conf"

5.开机启动并重启keepalived服务：

chkconfig keepalived on

service keepalived restart

keepalived.conf 配置-----------------------------------------------

vi /usr/local/keepalived/etc/keepalived/keepalived.conf

! Configuration File for keepalived
vrrp_script nginx_pid {   #检测脚本
    script "/usr/local/keepalived/bin/nginx_pid.sh" #检测脚本所在路径
    interval 2 #运行间隔
    weight 3
}

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server localhost
   smtp_connect_timeout 30
   router_id A #各节点区分开；备份节点设置： router_id B
}

vrrp_instance VI_1 {
    state MASTER #表示为主节点；备份节点设置：state:BUCKUP
    interface eth0 #网卡
    virtual_router_id 51
    priority 100 #优先级;      备份节点设置： priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.181/24 dev eth0 #虚拟路由ip地址，所有节点相同
    }
    track_script {
         nginx_pid #检测脚本名
    }
}

nginx_pid脚本：（如果不存在nginx pid，启动nginx，如等待3秒后不成功，关闭keepalived服务）

#!/bin/bash

A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then
      service nginx start
              sleep 3
                if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
                        service keepalived stop
fi
fi

测试： 浏览器访问虚拟IP 192.168.1.181 指向主服务器，关闭主服务器nginx后，访问192.168.1.181,指向了备份服务器即为成功。

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