nginx高可用

NGINX高可用

任务1 NGINX高可用

1. 准备工作

（1）需要准备两台服务器192.168.174.37（主） 和 192.168.174.36（备）

（2）两台服务器都安装nginx

（3）两台服务器安装keepalived

2. 安装Nginx

（1）使⽤用Nginx官⽅方提供的rpm包。

[root@nginx ~]# vi /etc/yum.repos.d/nginx.repo

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
enabled=1

（2）执行yum安装

 

[root@nginx ~]# yum -y install nginx

[root@nginx ~]# systemctl start nginx

[root@nginx ~]# systemctl enable nginx

3. 安装keepalived

 

[root@test ~]# yum -y install keepalived

4. 配置主keepalived

 

[root@nginx ~]# cd /etc/keepalived/
[root@nginx keepalived]# cp keepalived.conf keepalived.conf.bak
[root@nginx keepalived]# > keepalived.conf

[root@nginx keepalived]# vi keepalived.conf

global_defs {

    vrrp_garp_interval 0

    vrrp_gna_interval 0

}

 

#VIP1

    vrrp_instance VI_1 {

      state MASTER

      interface ens33　　

      virtual_router_id 50　

      priority 100

      advert_int 1

      authentication {

         auth_type PASS

         auth_pass 1111

      }

      virtual_ipaddress {

         192.168.174.50

      }

   }

5. 主keepalived.conf传到备机并修改

[root@nginx keepalived]# scp keepalived.conf root@192.168.174.36:/etc/keepalived/
The authenticity of host '192.168.174.36 (192.168.174.36)' can't be established.
ECDSA key fingerprint is af:b5:02:13:22:e6:f3:8e:75:7c:45:c5:dc:28:47:8e.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.174.36' (ECDSA) to the list of known hosts.
root@192.168.174.36's password: 
keepalived.conf                 100%  374     0.4KB/s   00:00

#切换到备机192.168.174.36(备)上去修改keepalived.conf，只需修改

[root@test keepalived]# vi keepalived.conf

　　

global_defs {

    vrrp_garp_interval 0

    vrrp_gna_interval 0

}



#VIP1

    vrrp_instance VI_1 {

      state BACKUP

      interface ens33　　

      virtual_router_id 50　

      priority 90

      advert_int 1

      authentication {

         auth_type PASS

         auth_pass 1111

      }

      virtual_ipaddress {

         192.168.174.50

      }

   }

6. 配置准备nginx

#主192.168.174.37

[root@nginx keepalived]# cd /etc/yum.repos.d/
[root@nginx yum.repos.d]# cp /usr/share/nginx/html/index.html /usr/share/nginx/html/index.html.bak
[root@nginx yum.repos.d]# >/usr/share/nginx/html/index.html
[root@nginx yum.repos.d]# vi /usr/share/nginx/html/index.html
web01

#备 192.168.174.36

[root@test yum.repos.d]# cp /usr/share/nginx/html/index.html /usr/share/nginx/html/index.html.bak
[root@test yum.repos.d]# >/usr/share/nginx/html/index.html
[root@test yum.repos.d]# vi /usr/share/nginx/html/index.html
web02

7. 启动服务并开机自启

[root@nginx yum.repos.d]# systemctl start nginx && systemctl enable nginx
[root@nginx yum.repos.d]# systemctl start keepalived && systemctl enable keepalived
Created symlink from /etc/systemd/system/multi-user.target.wants/keepalived.service to /usr/lib/systemd/system/keepalived.service.

8. 访问各站点（主备及vip）

 

 

 

9. 测试主备切换

在192.168.174.37（主）上，停掉keepalived，测试主备切换

[root@nginx ~]# systemctl stop keepalive

 

 

 

刷新页面，vip已经切换到备（192.168.174.36上）

 

 

 

再主上启动keepalived

[root@nginx ~]# systemctl start keepalived

刷新页面，发现又切换回来了

 

10. nginx存活测试

在主服务器192.168.174.37上添加如下参数：

global_defs {
    vrrp_garp_interval 0
    vrrp_gna_interval 0
}
vrrp_script chk_nginx {
    script "/opt/chknginx.sh"
    interval 1
    weight -20
}
#VIP1
    vrrp_instance VI_1 {
      state MASTER
      interface eno16777736
      virtual_router_id 50
      priority 100
      advert_int 1
      authentication {
         auth_type PASS
         auth_pass 1111
      }
      virtual_ipaddress {
         192.168.174.50
      }
      track_script {
        chk_nginx
      }
   }

#VIP1
    vrrp_instance VI_1 {
      state BACKUP
      interface eno16777736
      virtual_router_id 50
      priority 90
      advert_int 1
      authentication {
         auth_type PASS
         auth_pass 1111
      }
      virtual_ipaddress {
         192.168.174.50
      }
      track_script {
        chk_nginx
      }
   }

在/opt下创建chknginx.sh文件，授予权限

[root@nginx ~]# chmod 775 /opt/chknginx.sh

在主nginx上关闭服务器

[root@nginx ~]# shutdown -h now

则vip会漂移到备服务器192.168.174.37上。

浏览器输入 http://192.168.174.50 可查看是否有跳转到备服务器上