情境:
有兩個空間分別mount在/new與/new/2012並將/new nfs分享出去，client端使用指令將server的/new mount起來後，可以看到/new裡面有一個2012資料夾，但資料寫入卻是寫在/new那個空間
測試:
NFS server
1. NFS server 新增兩個硬碟空間，分別為/dev/vdb1,/dev/vdc1
| # fdisk -l ….......
Disk /dev/vdb: 2147 MB, 2147483648 bytes
16 heads, 63 sectors/track, 4161 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x8e79b1b7
Device Boot Start End Blocks Id System
/dev/vdb1 1 4161 2097112+ 83 Linux
Disk /dev/vdc: 2147 MB, 2147483648 bytes
16 heads, 63 sectors/track, 4161 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x7c784fd8
Device Boot Start End Blocks Id System
/dev/vdc1 1 4161 2097112+ 83 Linux
|
2. Server 建立Dir:/new 並將/dev/vdb1 mount 在/new
3. 在/new 目錄下建立2012目錄，修改權限後，mount /dev/vdc1 在/new/2012
| [root@node2 ~]# chmod -R 777 /new
[root@node2 ~]# ll /new
total 20
drwxrwxrwx. 3 777 root 4096 Sep 19 15:28 2012
drwxrwxrwx. 2 777 root 16384 Sep 19 14:29 lost+found
[root@node2 ~]# ll /new/2012/
total 16
drwxrwxrwx. 2 777 root 16384 Sep 19 14:29 lost+found
[root@node2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 5.5G 2.9G 2.4G 56% /
/dev/vdb1 2.0G 36M 1.9G 2% /new
/dev/vdc1 2.0G 35M 1.9G 2% /new/2012
|
4. # vi /etc/exports 加入
| /new *(sync,rw) |
5. # /etc/init.d/nfs restart 重啟nfs service
[root@node2 ~]# /etc/init.d/nfs restart
Shutting down NFS mountd: [ OK ]
Shutting down NFS daemon: [ OK ]
Shutting down NFS quotas: [ OK ]
Shutting down NFS services: [ OK ]
Starting NFS services: [ OK ]
Starting NFS quotas: [ OK ]
Starting NFS daemon: [ OK ]
Starting NFS mountd: [ OK ]
|
NFS client
1. # showmount -e “NFSserverIP”
2. # mount IP:/new /mnt
[root@solutions ~]# mount 172.16.1.136:/new /mnt
[root@solutions ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_soldtions-LogVol00 97G 14G 78G 16% /
…...
172.16.1.136:/new 2.0G 35M 1.9G 2% /mnt
|
3. # ls -al /mnt
[root@solutions ~]# ls /mnt
2012 lost+found
[root@solutions ~]# |
4. # touch /mnt/2012/test
5. # ls /mnt/2012
| [root@solutions ~]# touch /mnt/2012/test [root@solutions ~]# ls /mnt/2012/test /mnt/2012/test [root@solutions ~]# |
6. # ls -al /new/2012 回到NFS server檢查，發現檔案並沒產生
| [root@node2 ~]# ls /new/2012/ lost+found [root@node2 ~]# |
7. # /etc/init.d/nfs stop
# umount /new/2012 停掉NFS並umount /dev/vdc1
# ls -al /new/2012 發現剛產生的檔案在這邊(dev/vdb1)
| [root@node2 ~]# ls /new/2012/ lost+found [root@node2 ~]# /etc/init.d/nfs stop Shutting down NFS mountd: [ OK ] Shutting down NFS daemon: [ OK ] Shutting down NFS quotas: [ OK ] Shutting down NFS services: [ OK ] [root@node2 ~]# umount /new/2012/ [root@node2 ~]# ls /new/2012/ test [root@node2 ~]# |
解決方法:(在/etc/exports裡面加上nohide & crossmnt兩個參數)
1. # vim /etc/exports
| /new *(sync,rw,nohide,crossmnt) |
2. # /etc/init.d/nfs start 重啟nfs 服務
3.到Client 將/new mount 起來後
# echo `date` > /mnt/2012/test2
# ls -al /mnt/2012 應該會看到剛產生的檔案
| [root@solutions ~]# mount 172.16.1.136:/new /mnt [root@solutions ~]# echo `date` > /mnt/2012/test2 [root@solutions ~]# ls /mnt/2012/ lost+found test2 [root@solutions ~]# cat /mnt/2012/test2 Wed Sep 19 15:57:00 CST 2012 [root@solutions ~]# |
4. 到NFS server的 /new/2012/ 查看有無看到一樣的檔案
# cat /new/2012/test2
# df -h 確認mount point是想要的
| [root@node2 ~]# cat /new/2012/ lost+found/ test2 [root@node2 ~]# cat /new/2012/test2 Wed Sep 19 15:57:00 CST 2012 [root@node2 ~]# |
5.完工!!
