yum install -y keepalived

Profile on nfs01

[root@nfs01 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

 global_defs {
    router_id nfs01
 }
 
 vrrp_script check_data {
    script "/server/scripts/data.sh"
    interval 2 
    weight 60
 }
 
 vrrp_instance oldboy {
     state MASTER
     interface eth1
     virtual_router_id 51
     priority 90
     advert_int 1
     authentication {
         auth_type PASS
         auth_pass 1111
     }
     virtual_ipaddress {
         172.16.1.3/16 dev eth1 label eth1:1
     }
     track_script {
     check_data
     }
 }
 [root@nfs01 ~]# cat /server/scripts/data.sh 
 #!/bin/bash
 #    File Name: data.sh
 #    Author: su-lemon
 #    Blog: https://lemonsu9.github.io/
 #    Mail: 1510973908@qq.com 
 #    Created Time:Wed 19 Sep 2018 11:53:29 PM CST
 #    Description: This is a test script
 
 nfs_info=$(ps -ef|grep -c nfs)
 
 if [ $nfs_info -ge 4 ]    
     then
        echo "nfs is start~"     
        exit 0
     else
        echo "nfs is stop~"     
       exit 1
     fi
 
 echo 'net.ipv4.ip_nonlocal_bind = 1' >>/etc/sysctl.conf
 sysctl -p
 
 /etc/init.d/keepalived start

Profile on rsync

  [root@backup ~]# cat /etc/keepalived/keepalived.conf 
  ! Configuration File for keepalived
      
      global_defs {
         router_id backup
      }
      
      vrrp_instance oldboy {
          state BACKUP
          interface eth1
          virtual_router_id 51
          priority 100
          advert_int 1
          authentication {
              auth_type PASS
              auth_pass 1111
          }
          virtual_ipaddress {
              172.16.1.3/16 dev eth1 label eth1:1
          }
      }

Add a data module to the / etc/rsyncd.conf configuration file of backup, and change the uid gid to www

 [root@backup ~]# cat /etc/rsyncd.conf 
 uid = www
 gid = www
 use chroot = no
 max connections = 20
 timeout = 300
 pid file = /var/run/rsyncd.pid
 lock file = /var/run/rsync.lock
 log file = /var/log/rsyncd.log
 ignore errors
 read only = false
 list = false
 hosts allow = 172.16.1.0/24
 hosts deny = 0.0.0.0/32
 auth users = rsync_backup
 secrets file = /etc/rsync.password
 [backup]
 comment = "backup dir by oldboy"
 path = /backup
 [data]
 path = /data	

Configuration file for nfs service

nfs01 is the same as backup

 [root@nfs01 ~]# cat /etc/exports 
 #share /data by su-lemon for share at 20180918
 /data/www  172.16.1.0/24(rw,sync,no_all_squash,root_squash,anonuid=666,anongid=666)
 /data/blog  172.16.1.0/24(rw,sync,no_all_squash,root_squash,anonuid=666,anongid=666)
 /data/bbs  172.16.1.0/24(rw,sync,no_all_squash,root_squash,anonuid=666,anongid=666)


 [root@backup ~]# ll /data
 total 12
 drwxrwxrwx 2 www www 4096 Sep 20 00:17 bbs
 drwxrwxrwx 2 www www 4096 Sep 20 00:17 blog
 drwxrwxrwx 2 www www 4096 Sep 20 00:17 www
 
 
 [root@nfs01 ~]# ll /data
 total 12
 drwxrwxrwx 2 www www 4096 Sep 19 13:18 bbs
 drwxrwxrwx 2 www www 4096 Sep 19 13:18 blog
 drwxrwxrwx 2 www www 4096 Sep 19 13:18 www
 	
 data Directory permission 777 belongs to group and primary www	

Set the service to start automatically

 chkconfig nfs on
 chkconfig keepalived on

Mount the upload directory of the website on the web server

 [root@web01 ~]# ll /tmp
 total 964
 -rw-r--r--   1 root root 962858 Sep 18 11:22 bak.sql
 drwxr-xr-x  21 root root   4096 Sep 20 08:38 DedeCMS_bak
 drwxr-xr-x  11 root root   4096 Sep 20 08:44 Discuz_bak
 drwxr-xr-x   3 root root   4096 Sep 18 10:20 pear
 drwxr-xr-x   3 root root   4096 Sep 20 08:39 wordpress_bak
 drwxrwxrwx   3 www  www    4096 Sep 19 11:44 www
 -rw-------.  1 root root      0 Sep 17 20:44 yum.log

Migrate data out (same as web 01,02,03)

 [root@web01 ~]# mv /application/nginx/html/www/uploads/* /tmp/DedeCMS_bak/
 [root@web01 ~]# mv /application/nginx/html/blog/wp-content/uploads/* /tmp/wordpress_bak/
 [root@web01 ~]# mv /application/nginx/html/bbs/upload/data/attachment/* /tmp/Discuz_bak/

Mount (same as web 01,02,03)

 [root@web01 ~]# mount -t nfs 172.16.1.3:/data/www /application/nginx/html/www/uploads/data/
 [root@web01 ~]# mount -t nfs 172.16.1.3:/data/bbs /application/nginx/html/bbs/upload/data/attachment/
 [root@web01 ~]# mount -t nfs 172.16.1.3:/data/blog /application/nginx/html/blog/wp-content/uploads/
 [root@web01 ~]# df -h
 Filesystem            Size  Used Avail Use% Mounted on
 /dev/sda3              48G  3.8G   42G   9% /
 tmpfs                 190M     0  190M   0% /dev/shm
 /dev/sda1             190M   35M  146M  19% /boot
 172.16.1.3:/data/www   48G  1.5G   44G   4% /application/nginx-1.14/html/www/uploads/data
 172.16.1.3:/data/bbs   48G  1.5G   44G   4% /application/nginx-1.14/html/bbs/upload/data/attachment
 172.16.1.3:/data/blog
                       48G  1.5G   44G   4% /application/nginx-1.14/html/blog/wp-content/uploads

Move the data back (web01), but only the data on web01 needs to be moved back, web02 web03 does not need to move the data back

 [root@web01 wordpress_bak]# cp -r /tmp/wordpress_bak/* /application/nginx/html/blog/wp-content/uploads/
 [root@web01 wordpress_bak]# cp -r /tmp/Discuz_bak/* /application/nginx/html/bbs/upload/data/attachment/
 [root@web01 wordpress_bak]# cp -r /tmp/DedeCMS_bak/* /application/nginx/html/www/uploads/data/