MFS+Keepalived双机高可用热备方案操作记录

基于MFS的单点及手动备份的缺陷，考虑将其与Keepalived相结合以提高可用性。在Centos下MooseFS（MFS）分布式存储共享环境部署记录这篇文档部署环境的基础上，只需要做如下改动：

1）将master-server作为Keepalived_MASTER（启动mfsmaster、mfscgiserv）
2）将matelogger作为Keepalived_BACKUP（启动mfsmaster、mfscgiserv）
3）将ChunkServer服务器里配置的MASTER_HOST参数值改为VIP地址
4）clinet挂载的master的ip地址改为VIP地址
按照这样调整后，需要将Keepalived_MASTER和Keepalived_BACKUP里面的hosts绑定信息也修改下。

方案实施原理及思路

1）mfsmaster的故障恢复在1.6.5版本后可以由mfsmetalogger产生的日志文件changelog_ml.*.mfs和metadata.mfs.back文件通过命令mfsmetarestore恢复
2）定时从mfsmaster获取metadata.mfs.back 文件用于master恢复
3）Keepalived MASTER检测到mfsmaster进程宕停时会执行监控脚本，即自动启动mfsmaster进程，如果启动失败，则会强制kill掉keepalived和mfscgiserv进程，由此转移VIP到BACKUP上面。
4）若是Keepalived MASTER故障恢复，则会将VIP资源从BACKUP一方强制抢夺回来，继而由它提供服务
5）整个切换在2~5秒内完成 根据检测时间间隔。

架构拓扑图如下：

1）Keepalived_MASTER（mfs master）机器上的操作

mfs的master日志服务器的安装配置已经在另一篇文档中详细记录了，这里就不做赘述了。下面直接记录下keepalived的安装配置：
-----------------------------------------------------------------------------------------------------------------------
安装Keepalived
[root@Keepalived_MASTER ~]# yum install -y openssl-devel popt-devel
[root@Keepalived_MASTER ~]# cd /usr/local/src/
[root@Keepalived_MASTER src]# wget http://www.keepalived.org/software/keepalived-1.3.5.tar.gz
[root@Keepalived_MASTER src]# tar -zvxf keepalived-1.3.5.tar.gz
[root@Keepalived_MASTER src]# cd keepalived-1.3.5
[root@Keepalived_MASTER keepalived-1.3.5]# ./configure --prefix=/usr/local/keepalived
[root@Keepalived_MASTER keepalived-1.3.5]# make && make install

[root@Keepalived_MASTER keepalived-1.3.5]# cp /usr/local/src/keepalived-1.3.5/keepalived/etc/init.d/keepalived /etc/rc.d/init.d/
[root@Keepalived_MASTER keepalived-1.3.5]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@Keepalived_MASTER keepalived-1.3.5]# mkdir /etc/keepalived/
[root@Keepalived_MASTER keepalived-1.3.5]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
[root@Keepalived_MASTER keepalived-1.3.5]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
[root@Keepalived_MASTER keepalived-1.3.5]# echo "/etc/init.d/keepalived start" >> /etc/rc.local

[root@Keepalived_MASTER keepalived-1.3.5]# chmod +x /etc/rc.d/init.d/keepalived      #添加执行权限
[root@Keepalived_MASTER keepalived-1.3.5]# chkconfig keepalived on                   #设置开机启动
[root@Keepalived_MASTER keepalived-1.3.5]# service keepalived start                   #启动
[root@Keepalived_MASTER keepalived-1.3.5]# service keepalived stop                    #关闭
[root@Keepalived_MASTER keepalived-1.3.5]# service keepalived restart                 #重启

配置Keepalived
[root@Keepalived_MASTER ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf-bak
[root@Keepalived_MASTER ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
  notification_email {
    root@localhost
    }

notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MFS_HA_MASTER
}

vrrp_script chk_mfs {
  script "/usr/local/mfs/keepalived_check_mfsmaster.sh"
  interval 2
  weight 2
}

vrrp_instance VI_1 {
  state MASTER
  interface eth0
  virtual_router_id 51
  priority 100
  advert_int 1
  authentication {
    auth_type PASS
    auth_pass 1111
}
  track_script {
    chk_mfs
}
virtual_ipaddress {
    182.48.115.239
}
notify_master "/etc/keepalived/clean_arp.sh 182.48.115.239"
}

接着编写监控脚本
[root@Keepalived_MASTER ~]# vim /usr/local/mfs/keepalived_check_mfsmaster.sh
#!/bin/bash
A=`ps -C mfsmaster --no-header | wc -l`
if [ $A -eq 0 ];then
/etc/init.d/mfsmaster start
sleep 3
   if [ `ps -C mfsmaster --no-header | wc -l ` -eq 0 ];then
      /usr/bin/killall -9 mfscgiserv
      /usr/bin/killall -9 keepalived
   fi
fi

[root@Keepalived_MASTER ~]# chmod 755 /usr/local/mfs/keepalived_check_mfsmaster.sh

设置更新虚拟服务器（VIP）地址的arp记录到网关脚本
[root@Keepalived_MASTER ~]# vim /etc/keepalived/clean_arp.sh
#!/bin/sh
VIP=$1
GATEWAY=182.48.115.254                                        //这个是网关地址
/sbin/arping -I eth0 -c 5 -s $VIP $GATEWAY &>/dev/null

[root@Keepalived_MASTER ~]# chmod 755 /etc/keepalived/clean_arp.sh

启动keepalived（确保Keepalived_MASTER机器的mfs master服务和Keepalived服务都要启动）
[root@Keepalived_MASTER ~]# /etc/init.d/keepalived start
Starting keepalived:                                       [  OK  ]
[root@Keepalived_MASTER ~]# ps -ef|grep keepalived
root     28718     1  0 13:09 ?        00:00:00 keepalived -D
root     28720 28718  0 13:09 ?        00:00:00 keepalived -D
root     28721 28718  0 13:09 ?        00:00:00 keepalived -D
root     28763 27466  0 13:09 pts/0    00:00:00 grep keepalived

查看vip
[root@Keepalived_MASTER ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:09:21:60 brd ff:ff:ff:ff:ff:ff
    inet 182.48.115.233/27 brd 182.48.115.255 scope global eth0
    inet 182.48.115.239/32 scope global eth0
    inet6 fe80::5054:ff:fe09:2160/64 scope link
       valid_lft forever preferred_lft forever

2）Keepalived_BACKUP（mfs master）机器上的操作

在另一篇文档里，该机器是作为metalogger元数据日志服务器的，那么在这个高可用环境下，该台机器改为Keepalived_BACKUP使用。
即去掉metalogger的部署，直接部署mfs master（部署过程参考另一篇文档）。下面直接说下Keepalived_BACKUP下的Keepalived配置：

安装Keepalived
[root@Keepalived_BACKUP ~]# yum install -y openssl-devel popt-devel
[root@Keepalived_BACKUP ~]# cd /usr/local/src/
[root@Keepalived_BACKUP src]# wget http://www.keepalived.org/software/keepalived-1.3.5.tar.gz
[root@Keepalived_BACKUP src]# tar -zvxf keepalived-1.3.5.tar.gz
[root@Keepalived_BACKUP src]# cd keepalived-1.3.5
[root@Keepalived_BACKUP keepalived-1.3.5]# ./configure --prefix=/usr/local/keepalived
[root@Keepalived_BACKUP keepalived-1.3.5]# make && make install

[root@Keepalived_BACKUP keepalived-1.3.5]# cp /usr/local/src/keepalived-1.3.5/keepalived/etc/init.d/keepalived /etc/rc.d/init.d/
[root@Keepalived_BACKUP keepalived-1.3.5]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@Keepalived_BACKUP keepalived-1.3.5]# mkdir /etc/keepalived/
[root@Keepalived_BACKUP keepalived-1.3.5]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
[root@Keepalived_BACKUP keepalived-1.3.5]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
[root@Keepalived_BACKUP keepalived-1.3.5]# echo "/etc/init.d/keepalived start" >> /etc/rc.local

[root@Keepalived_BACKUP keepalived-1.3.5]# chmod +x /etc/rc.d/init.d/keepalived      #添加执行权限
[root@Keepalived_BACKUP keepalived-1.3.5]# chkconfig keepalived on                   #设置开机启动
[root@Keepalived_BACKUP keepalived-1.3.5]# service keepalived start                   #启动
[root@Keepalived_BACKUP keepalived-1.3.5]# service keepalived stop                    #关闭
[root@Keepalived_BACKUP keepalived-1.3.5]# service keepalived restart                 #重启

配置Keepalived
[root@Keepalived_BACKUP ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf-bak
[root@Keepalived_BACKUP ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
  notification_email {
    root@localhost
    }

notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MFS_HA_BACKUP
}

vrrp_script chk_mfs {
  script "/usr/local/mfs/keepalived_check_mfsmaster.sh"
  interval 2
  weight 2
}

vrrp_instance VI_1 {
  state BACKUP
  interface eth0
  virtual_router_id 51
  priority 99
  advert_int 1
  authentication {
    auth_type PASS
    auth_pass 1111
}
  track_script {
    chk_mfs
}
virtual_ipaddress {
    182.48.115.239
}
notify_master "/etc/keepalived/clean_arp.sh 182.48.115.239"
}

接着编写监控脚本
[root@Keepalived_BACKUP ~]# vim /usr/local/mfs/keepalived_notify.sh
#!/bin/bash
A=`ps -C mfsmaster --no-header | wc -l`
if [ $A -eq 0 ];then
/etc/init.d/mfsmaster start
sleep 3
   if [ `ps -C mfsmaster --no-header | wc -l ` -eq 0 ];then
      /usr/bin/killall -9 mfscgiserv
      /usr/bin/killall -9 keepalived
   fi
fi

[root@Keepalived_BACKUP ~]# chmod 755 /usr/local/mfs/keepalived_notify.sh

设置更新虚拟服务器（VIP）地址的arp记录到网关脚本（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup两台机器都要操作）
[root@Keepalived_BACKUP ~]# vim /etc/keepalived/clean_arp.sh
#!/bin/sh
VIP=$1
GATEWAY=182.48.115.254
/sbin/arping -I eth0 -c 5 -s $VIP $GATEWAY &>/dev/null

启动keepalived
[root@Keepalived_BACKUP ~]# /etc/init.d/keepalived start
Starting keepalived:
[root@Keepalived_BACKUP ~]# ps -ef|grep keepalived
root     17565     1  0 11:06 ?        00:00:00 keepalived -D
root     17567 17565  0 11:06 ?        00:00:00 keepalived -D
root     17568 17565  0 11:06 ?        00:00:00 keepalived -D
root     17778 17718  0 13:47 pts/1    00:00:00 grep keepalived

要保证Keepalived_BACKUP机器的mfs master服务和keepalived服务都要启动！

3）chunkServer的配置

只需要将mfschunkserver.cfg文件中的MASTER_HOST参数配置成182.48.115.239，即VIP地址。
其他的配置都不需要修改。然后重启mfschunkserver服务

4）clinet客户端的配置

只需要见挂载命令中的元数据ip改为182.48.115.249即可！

[root@clinet-server ~]# mkdir /mnt/mfs
[root@clinet-server ~]# mkdir /mnt/mfsmeta 

[root@clinet-server ~]# /usr/local/mfs/bin/mfsmount /mnt/mfs -H 182.48.115.239
mfsmaster accepted connection with parameters: read-write,restricted_ip,admin ; root mapped to root:root

[root@clinet-server ~]# /usr/local/mfs/bin/mfsmount -m /mnt/mfsmeta -H 182.48.115.239
mfsmaster accepted connection with parameters: read-write,restricted_ip

[root@clinet-server ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                      8.3G  3.8G  4.1G  49% /
tmpfs                 499M  228K  498M   1% /dev/shm
/dev/vda1             477M   35M  418M   8% /boot
/dev/sr0              3.7G  3.7G     0 100% /media/CentOS_6.8_Final
182.48.115.239:9421   107G   42G   66G  39% /mnt/mfs

[root@clinet-server ~]# mount
/dev/mapper/VolGroup-lv_root on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/vda1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
gvfs-fuse-daemon on /root/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev)
/dev/sr0 on /media/CentOS_6.8_Final type iso9660 (ro,nosuid,nodev,uhelper=udisks,uid=0,gid=0,iocharset=utf8,mode=0400,dmode=0500)
182.48.115.239:9421 on /mnt/mfs type fuse.mfs (rw,nosuid,nodev,allow_other)
182.48.115.239:9421 on /mnt/mfsmeta type fuse.mfsmeta (rw,nosuid,nodev,allow_other)

验证下客户端挂载MFS文件系统后的数据读写是否正常
[root@clinet-server ~]# cd /mnt/mfs
[root@clinet-server mfs]# echo "12312313" > test.txt
[root@clinet-server mfs]# cat test.txt
12312313

[root@clinet-server mfs]# rm -f test.txt
[root@clinet-server mfs]# cd ../mfsmeta/trash/
[root@clinet-server trash]# find . -name "*test*"
./003/00000003|test.txt
[root@clinet-server trash]# cd ./003/
[root@clinet-server 003]# ls
00000003|test.txt  undel
[root@clinet-server 003]# mv 00000003\|test.txt undel/
[root@clinet-server 003]# ls /mnt/mfs
test.txt
[root@clinet-server 003]# cat /mnt/mfs/test.txt
12312313

以上说明挂载后的MFS数据共享正常

5）Keepalived_MASTER和Keepalived_BACKUP的iptales防火墙设置

Keepalived_MASTER和Keepalived_BACKUP的防火墙iptables在实验中是关闭的。
如果开启了iptables防火墙功能，则需要在两台机器的iptables里配置如下：

可以使用"ss -l"命令查看本机监听的端口
[root@Keepalived_MASTER ~]# ss -l
State       Recv-Q Send-Q                                     Local Address:Port                                         Peer Address:Port
LISTEN      0      100                                                    *:9419                                                    *:*
LISTEN      0      100                                                    *:9420                                                    *:*
LISTEN      0      100                                                    *:9421                                                    *:*
LISTEN      0      50                                                     *:9425                                                    *:*
LISTEN      0      128                                                   :::ssh                                                    :::*
LISTEN      0      128                                                    *:ssh                                                     *:*
LISTEN      0      100                                                  ::1:smtp                                                   :::*
LISTEN      0      100                                            127.0.0.1:smtp                                                    *:*    

[root@Keepalived_MASTER ~]# vim /etc/sysconfig/iptables
........
-A INPUT -s 182.148.15.0/24 -d 224.0.0.18 -j ACCEPT       #允许组播地址通信。注意设置这两行，就会在Keepalived_MASTER故障恢复后，将VIP资源从Keepalived_BACK那里再转移回来
-A INPUT -s 182.148.15.0/24 -p vrrp -j ACCEPT             #允许VRRP（虚拟路由器冗余协）通信
-A INPUT -m state --state NEW -m tcp -p tcp --dport 9419 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 9420 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 9421 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 9425 -j ACCEPT 

[root@Keepalived_MASTER ~]# /etc/init.d/iptables start

6）故障切换后的数据同步脚本

上面的配置可以实现Keepalived_MASTER机器出现故障（keepalived服务关闭），VIP资源转移到Keepalived_BACKUP上；
当Keepalived_MASTER机器故障恢复（即keepalived服务开启），那么它就会将VIP资源再次抢夺回来！

但是只是实现了VIP资源的转移，但是MFS文件系统的数据该如何进行同步呢？
下面在两台机器上分别写了数据同步脚本（Keepalived_MASTER和Keepalived_BACKUP要提前做好双方的ssh无密码登陆的信任关系）

Keepalived_MASTER机器上
[root@Keepalived_MASTER ~]# vim /usr/local/mfs/MFS_DATA_Sync.sh
#!/bin/bash
A=`ip addr|grep 182.48.115.239|awk -F" " '{print $2}'|cut -d"/" -f1`
if [ $A == 182.48.115.239 ];then
   /etc/init.d/mfsmaster stop
   /bin/rm -f /usr/local/mfs/var/mfs/*
   /usr/bin/rsync -e "ssh -p22" -avpgolr 182.48.115.235:/usr/local/mfs/var/mfs/* /usr/local/mfs/var/mfs/
   /usr/local/mfs/sbin/mfsmetarestore -m
   /etc/init.d/mfsmaster -a
   sleep 3
   echo "this server has become the master of MFS"
   if [ $A != 182.48.115.239 ];then
   echo "this server is still MFS's slave"
   fi
fi

Keepalived_BACKUP机器上
[root@Keepalived_BACKUP ~]# vim /usr/local/mfs/MFS_DATA_Sync.sh
#!/bin/bash
A=`ip addr|grep 182.48.115.239|awk -F" " '{print $2}'|cut -d"/" -f1`
if [ $A == 182.48.115.239 ];then
   /etc/init.d/mfsmaster stop
   /bin/rm -f /usr/local/mfs/var/mfs/*
   /usr/bin/rsync -e "ssh -p22" -avpgolr 182.48.115.233:/usr/local/mfs/var/mfs/* /usr/local/mfs/var/mfs/
   /usr/local/mfs/sbin/mfsmetarestore -m
   /etc/init.d/mfsmaster -a
   sleep 3
   echo "this server has become the master of MFS"
   if [ $A != 182.48.115.239 ];then
   echo "this server is still MFS's slave"
   fi
fi

即当VIP资源转移到自己这一方时，执行这个同步脚本，就会将对方的数据同步过来了。

7）故障切换测试

1）关闭Keepalived_MASTER的mfsmaster服务
由于keepalived.conf文件中的监控脚本定义，当发现mfsmaster进程不存在时，就会主动启动mfsmaster。只要当mfsmaster启动失败，才会强制
killall掉keepalived和mfscgiserv进程

[root@Keepalived_MASTER ~]# /etc/init.d/mfsmaster stop
sending SIGTERM to lock owner (pid:29266)
waiting for termination terminated

发现mfsmaster关闭后，会自动重启
[root@Keepalived_MASTER ~]# ps -ef|grep mfs
root     26579     1  0 16:00 ?        00:00:00 /usr/bin/python /usr/local/mfs/sbin/mfscgiserv start
root     30389 30388  0 17:18 ?        00:00:00 /bin/bash /usr/local/mfs/keepalived_check_mfsmaster.sh
mfs      30395     1 71 17:18 ?        00:00:00 /etc/init.d/mfsmaster start

默认情况下，VIP资源是在Keepalived_MASTER上的
[root@Keepalived_MASTER ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:09:21:60 brd ff:ff:ff:ff:ff:ff
    inet 182.48.115.233/27 brd 182.48.115.255 scope global eth0
    inet 182.48.115.239/32 scope global eth0
    inet6 fe80::5054:ff:fe09:2160/64 scope link
       valid_lft forever preferred_lft forever

在client端挂载后（通过VIP地址挂载），查看数据
[root@clinet-server ~]# cd /mnt/mfs
[root@clinet-server mfs]# ll
total 4
-rw-r--r-- 1 root root 9 May 24 17:11 grace
-rw-r--r-- 1 root root 9 May 24 17:11 grace1
-rw-r--r-- 1 root root 9 May 24 17:11 grace2
-rw-r--r-- 1 root root 9 May 24 17:11 grace3
-rw-r--r-- 1 root root 9 May 24 17:10 kevin
-rw-r--r-- 1 root root 9 May 24 17:10 kevin1
-rw-r--r-- 1 root root 9 May 24 17:10 kevin2
-rw-r--r-- 1 root root 9 May 24 17:10 kevin3

当keepalived关闭（这个时候mfsmaster关闭后就不会自动重启了，因为keepalived关闭了，监控脚本就不会执行了）
[root@Keepalived_MASTER ~]# /etc/init.d/keepalived stop
Stopping keepalived:                                       [  OK  ]
[root@Keepalived_MASTER ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:09:21:60 brd ff:ff:ff:ff:ff:ff
    inet 182.48.115.233/27 brd 182.48.115.255 scope global eth0
    inet6 fe80::5054:ff:fe09:2160/64 scope link
       valid_lft forever preferred_lft forever

发现，Keepalived_MASTER的keepalived关闭后，VIP资源就不在它上面了。

查看系统日志，发现VIP已经转移
[root@Keepalived_MASTER ~]# tail -1000 /var/log/messages
.......
May 24 17:11:19 centos6-node1 Keepalived_vrrp[29184]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth0 for 182.48.115.239
May 24 17:11:19 centos6-node1 Keepalived_vrrp[29184]: Sending gratuitous ARP on eth0 for 182.48.115.239
May 24 17:11:19 centos6-node1 Keepalived_vrrp[29184]: Sending gratuitous ARP on eth0 for 182.48.115.239
May 24 17:11:19 centos6-node1 Keepalived_vrrp[29184]: Sending gratuitous ARP on eth0 for 182.48.115.239
May 24 17:11:19 centos6-node1 Keepalived_vrrp[29184]: Sending gratuitous ARP on eth0 for 182.48.115.239

然后到Keepalived_BACKUP上面发现，VIP已经过来了
[root@Keepalived_BACKUP ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:82:69:69 brd ff:ff:ff:ff:ff:ff
    inet 182.48.115.235/27 brd 182.48.115.255 scope global eth0
    inet 182.48.115.239/32 scope global eth0
    inet6 fe80::5054:ff:fe82:6969/64 scope link
       valid_lft forever preferred_lft forever

查看日志，也能看到VIP转移过来了
[root@Keepalived_BACKUP ~]# tail -1000 /var/log/messages
.......
May 24 17:27:57 centos6-node2 Keepalived_vrrp[5254]: VRRP_Instance(VI_1) Received advert with higher priority 100, ours 99
May 24 17:27:57 centos6-node2 Keepalived_vrrp[5254]: VRRP_Instance(VI_1) Entering BACKUP STATE
May 24 17:27:57 centos6-node2 Keepalived_vrrp[5254]: VRRP_Instance(VI_1) removing protocol VIPs.

再次在clinet客户端挂载后，查看数据
[root@clinet-server mfs]# ll
[root@clinet-server mfs]#

发现没有数据，这就需要执行上面的那个同步脚本
[root@Keepalived_BACKUP ~]# sh -x /usr/local/mfs/MFS_DATA_Sync.sh 

再次在clinet客户端挂载后，查看数据
[root@clinet-server mfs]# ll
total 4
-rw-r--r--. 1 root root 9 May 24 17:11 grace
-rw-r--r--. 1 root root 9 May 24 17:11 grace1
-rw-r--r--. 1 root root 9 May 24 17:11 grace2
-rw-r--r--. 1 root root 9 May 24 17:11 grace3
-rw-r--r--. 1 root root 9 May 24 17:10 kevin
-rw-r--r--. 1 root root 9 May 24 17:10 kevin1
-rw-r--r--. 1 root root 9 May 24 17:10 kevin2
-rw-r--r--. 1 root root 9 May 24 17:10 kevin3

发现数据已经同步过来，然后再更新数据
[root@clinet-server mfs]# rm -f ./*
[root@clinet-server mfs]# echo "123123" > wangshibo
[root@clinet-server mfs]# echo "123123" > wangshibo1
[root@clinet-server mfs]# echo "123123" > wangshibo2
[root@clinet-server mfs]# echo "123123" > wangshibo3
[root@clinet-server mfs]# echo "123123" > wangshibo4
[root@clinet-server mfs]# ll
total 3
-rw-r--r--. 1 root root 7 May 24 17:26 wangshibo
-rw-r--r--. 1 root root 7 May 24 17:26 wangshibo1
-rw-r--r--. 1 root root 7 May 24 17:26 wangshibo2
-rw-r--r--. 1 root root 7 May 24 17:26 wangshibo3
-rw-r--r--. 1 root root 7 May 24 17:26 wangshibo4

2）恢复Keepalived_MASTER的keepalived进程
[root@Keepalived_MASTER ~]# /etc/init.d/keepalived start
Starting keepalived:                                       [  OK  ]
[root@Keepalived_MASTER ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:09:21:60 brd ff:ff:ff:ff:ff:ff
    inet 182.48.115.233/27 brd 182.48.115.255 scope global eth0
    inet 182.48.115.239/32 scope global eth0
    inet6 fe80::5054:ff:fe09:2160/64 scope link
       valid_lft forever preferred_lft forever

发现Keepalived_MASTER的keepalived进程启动后，VIP资源又抢夺回来。查看/var/log/messages日志能看出VIP资源转移回来

再次查看Keepalived_BACKUP，发现VIP不在了
[root@Keepalived_BACKUP ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:82:69:69 brd ff:ff:ff:ff:ff:ff
    inet 182.48.115.235/27 brd 182.48.115.255 scope global eth0
    inet6 fe80::5054:ff:fe82:6969/64 scope link
       valid_lft forever preferred_lft forever

在client端挂载后（通过VIP地址挂载），查看数据
[root@clinet-server mfs]# ll
total 4
-rw-r--r--. 1 root root 9 May 24 17:11 grace
-rw-r--r--. 1 root root 9 May 24 17:11 grace1
-rw-r--r--. 1 root root 9 May 24 17:11 grace2
-rw-r--r--. 1 root root 9 May 24 17:11 grace3
-rw-r--r--. 1 root root 9 May 24 17:10 kevin
-rw-r--r--. 1 root root 9 May 24 17:10 kevin1
-rw-r--r--. 1 root root 9 May 24 17:10 kevin2
-rw-r--r--. 1 root root 9 May 24 17:10 kevin3

发现数据还是旧的，需要在Keepalived_MASTER上执行同步
[root@Keepalived_MASTER ~]# sh -x /usr/local/mfs/MFS_DATA_Sync.sh 

再次在clinet客户端挂载后，查看数据,发现已经同步
[root@xqsj_web3 mfs]# ll
total 3
-rw-r--r-- 1 root root 7 May 24 17:26 wangshibo
-rw-r--r-- 1 root root 7 May 24 17:26 wangshibo1
-rw-r--r-- 1 root root 7 May 24 17:26 wangshibo2
-rw-r--r-- 1 root root 7 May 24 17:26 wangshibo3
-rw-r--r-- 1 root root 7 May 24 17:26 wangshibo4