遠程掛載NFS時mount.nfs: access denied by server while mounting 一個解決辦法

mount.nfs: access denied by server while mounting 192.168.3.12:/home/lzgonline/rootfs

百度、谷歌了好久，大部分都說是權限設置有問題，其實文件夾權限都設爲777了，權限上都沒問題，hosts.deny和hosts.allow都保留默認設置，防火牆也關了，該設置的都設置了，但仍是被拒絕，非常鬱悶，就在束手無策的時候，經過查看一些linux技術論壇後逐漸找到了問題所在。

首先使用命令查看出錯日誌文件

[root@lzgonline init.d]# cat /var/log/messages | grep mount

Jun 29 00:49:04 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1689

Jun 29 00:51:02 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1710

Jun 29 01:02:17 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1916

Jun 29 01:09:51 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 2157

Jun 29 01:17:02 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 2318

 

從出錯日誌能夠看出，mount.nfs: access denied by server while mounting 192.168.3.12:/home/lzgonline/rootfs 被拒絕的緣由是由於使用了非法端口，功夫總沒白費，終於在一個linux技術論壇上找到了答案：

I googled and found that since the port is over 1024 I needed to add the "insecure" option to the relevant line in /etc/exports on the server. Once I did that (and ran exportfs -r), the mount -a on the client worked.

//若是端口號大於1024，則須要將 insecure 選項加入到配置文件（/etc/exports）相關選項中mount客戶端才能正常工做:

查看 exports 手冊中關於 secure 選項說明也發現確實如此

[root@lzgonline init.d]# man exports

secure,This  option requires that requests originate on an Internet port less than IPPORT_RESERVED (1024). This option is on by default. To turn it off, specify insecure.

//secure 選項要求mount客戶端請求源端口小於1024（然而在使用 NAT 網絡地址轉換時端口通常老是大於1024的），默認狀況下是開啓這個選項的，若是要禁止這個選項，則使用 insecure 標識

修改配置文件/etc/exports，加入 insecure 選項

/home/lzgonline/rootfs  *(insecure,rw,async,no_root_squash)

保存退出

而後重啓nfs服務：service nfs restart

而後問題就解決了

轉自http://blog.chinaunix.net/uid-20554957-id-3444786.html