Nginx+keepalived实现双机热备部署

一、安装必要的软件包，以保证nginx和keepalived能安装：

yum -y install gcc gcc-c++ make

yum -y install wget      #安装下载工具                                                 

yum -y install pcre-devel      #安装nginx的依赖软件包                                           

yum -y install openssl-devel          #安装keepalived依赖软件包                                    
            
yum -y install popt-devel           #安装keepalived依赖软件包                                       
             

二、安装nginx

wget http://nginx.org/download/nginx-1.2.8.tar.gz    #下载nginx                      

tar -zxf nginx-1.2.8.tar.gz

 

./configure --prefix=/etc/local/nginx

make && make install

测试安装成功

三、安装keepalived-1.2.0

wget http://keepalived.org/software/keepalived-1.2.0.tar.gz

（wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz）

tar -zxf keepalived-1.2.0.tar.gz

cd keepalived-1.2.0

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

错误：use IPVS Framework  、 IPVS sync daemon support两个必须为YES，才算编译成功

make

make install

四、复制文件：

1、ln -s /usr/local/keepalived/etc/keepalived /etc/keepalived

2、ln -s /usr/local/keepalived/etc/rc.d/init.d/keepalived

/etc/rc.d/init.d/keepalived

3、ln -s /usr/local/keepalived/etc/sysconfig/keepalived/etc/sysconfig/keepalived

4、ln -s /usr/local/keepalived/sbin/keepalived /usr/bin/keepalived

5、chkconfig keepalived on  

五、配置master配置文件：

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived
    global_defs {
       notification_email {
           [e-mail]     #设置报警邮件地址，可以设置多个，每行一个。
       }
       notification_email_from [e-mail]  #设置邮件的发送地址
       smtp_server 127.0.0.1            #设置smtp server地址
       smtp_connect_timeout 30    #设置连接smtp server的超时时间
       router_id LVS_DEVEL           #表示运行keepalived服务器的一个标识。发邮件时显示在邮件主题的信息
    }
    vrrp_script chk_nginx {
        script "/usr/local/keepalived/sbin/check_nginx.sh"   #该脚本检测ngnix的运行状态，并在nginx进程不存在时尝试重新启动ngnix，如果启动失败则停止keepalived，准备让其它机器接管。
        interval 2              #每2s检测一次
        weight 2               #检测失败（脚本返回非0）则优先级2
    }
    vrrp_instance VI_1 {
        state MASTER              #指定keepalived的角色，MASTER表示主服务器，BACKUP表示备用服务器
        interface eth0              #指定HA监测网络的接口
        virtual_router_id 55    #虚拟路由标识，这个标识是一个数字，同一个vrrp实例使用唯一的标识。即同一vrrp_instance下，MASTER和BACKUP必须是一致的
        priority 100                  #定义优先级，数字越大，优先级越高，在同一个vrrp_instance下，MASTER的优先级必须大于BACKUP的优先级
        advert_int 1            #设定MASTER与BACKUP负载均衡器之间同步检查的时间间隔，单位是秒
        authentication {        #设置验证类型和密码
            auth_type PASS      #设置验证类型，主要有PASS和AH两种
            auth_pass lvtaosuai #设置验证密码，在同一个vrrp_instance下，MASTER与BACKUP必须使用相同的密码才能正常通信
        }
        virtual_ipaddress {     #设置虚拟IP地址，可以设置多个虚拟IP地址，每行一个

            192.168.35.201

            192.168.35.202

        }
        track_script {
            chk_nginx           #引用VRRP脚本，即在 vrrp_script 部分指定的名字。定期运行它们来改变优先级，并最终引发主备切换。
        }
    }

六、配置backup配置文件：

vi /etc/keepalived/keepalived.conf

 ! Configuration File for keepalived
    global_defs {
       notification_email {
           [e-mail]
       }
       notification_email_from [e-mail]
       smtp_server 127.0.0.1
       smtp_connect_timeout 30
       router_id LVS_DEVEL
    }
    vrrp_script chk_nginx {
        script "/usr/local/keepalived/sbin/check_nginx.sh"
        interval 2        
        weight 2          
    }
    vrrp_instance VI_1 {
        state BACKUP   #指定keepalived的角色，MASTER表示此主机是主服务器，BACKUP表示此主机是备用服务器
        interface eth0
        virtual_router_id 55
        priority 50
        advert_int 1
        nopreempt
        authentication {
            auth_type PASS
            auth_pass lvtaosuai
        }
        virtual_ipaddress {

         192.168.35.201

         192.168.35.202

        }
        track_script {
            chk_nginx
        }
    }

七、脚本编写：

vi /usr/local/keepalived/sbin/check_nginx.sh

#!/bin/bash

if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == ""

];then
   #echo 1
   /etc/init.d/nginx start
   sleep 5
   if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == ""

];then
      /etc/init.d/keepalived stop
      #echo 2
   fi
fi

八、给脚本执行权限

chmod +x /usr/local/keepalived/sbin/check_nginx.sh

九、测试
service keepalived start  #启动Nginx-Master

service keepalived start  #启动Nginx-Backup

ip addr  #2台服务器分别执行，绑定虚拟IP在Nginx-Master

service keepalived stop  #停止Nginx-Backup

ip addr  #2台服务器分别执行，绑定虚拟IP在Nginx-Backup

service keepalived start  #再启动Nginx-Backup

ip addr  #2台服务器分别执行，绑定虚拟IP在Nginx-Master

 分享：http://wangzhijian.blog.51cto.com/6427016/1701577
yun部署keepalived  http://deidara.blog.51cto.com/400447/302402/