四、客户端挂载：
1、创建需要挂载的目录：
[root@localhost ~]# mkdir /usr/local/test
[root@localhost ~]#
2、测试挂载：
[root@localhost ~]# showmount -e 192.168.1.225
Export list for 192.168.1.225:
/usr/local/test 192.168.1.226
[root@localhost ~]#
如果显示：rpc mount export: RPC: Unable to receive; errno = No route to host，则需要在服务端关闭防火墙（稍候会详细说）。
3、挂载：
[root@localhost ~]# mount -t nfs 192.168.1.225:/usr/local/test /usr/local/test
[root@localhost ~]# 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)
/dev/sda1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)
192.168.1.225:/usr/local/test on /usr/local/test type nfs (rw,vers=4,addr=192.168.1.225,clientaddr=192.168.1.226)
[root@localhost ~]#
如果信息如上显示则挂载成功！
4、测试：
客户端生成一个文件：
[root@centos2 /]# cd /usr/local/test/
[root@centos2 test]# echo "hello nfs test">>test
[root@centos2 test]# ll
total 4
-rw-r--r-- 1 root root 15 Apr 9 13:24 test
[root@centos2 test]#
服务端检查：
[root@centos2 /]# cd /usr/local/test/
[root@centos2 test]# ll
total 4
-rw-r--r-- 1 root root 15 Apr 9 13:24 test
[root@centos2 test]#
挂载成功！
五、解除挂载：
[root@localhost ~]# umount /usr/local/test
[root@localhost ~]# 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)
/dev/sda1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)
[root@localhost ~]#
如果遇到：umount.nfs: /usr/local/test: device is busy
可能用命令：
[root@localhost /]# fuser -m -v /usr/local/test
用户 进程号 权限 命令
/usr/local/test/: root 2798 ..c.. bash
root 2996 ..c.. su
[root@localhost /]# kill -9 2798
[root@localhost /]# kill -9 2996
[root@localhost /]# umount /usr/local/test
[root@localhost /]#
六、服务器端防火墙设置（NFS 开启防墙配置）：
