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


测试安装成功

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




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

nginx双主热备 nginx双机热备方案_集群


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 {
            admin@lvtao.net     #设置报警邮件地址，可以设置多个，每行一个。 
        }
        notification_email_from admin@lvtao.net  #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 {
            admin@lvtao.net
        }
        notification_email_from admin@lvtao.net
        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