Creating files in nfs mount as different user

sahana12 · 08-23-2012, 02:06 AM

in server:
in /etc/exports:
/hello *(rw,no_root_squash)
started nfs

in client:
mounted /hello on /hello1

Now I have to check whether can I create file "file" on /hello with user1 and same file "file" on /hello1 mount point with different user user2. If can , How to do ? If not, why its not possible? May I know the answers please.

byannoni · 08-23-2012, 07:59 AM

To act as user2, run this:

Code:

su user2

chrism01 · 08-23-2012, 06:46 PM

Sounds a bit like homework, but anyway...

1. use touch cmd http://linux.die.net/man/1/touch

2. use

Code:

su - user2

The ' - ' gives you user2's env, otherwise you keep your own ... This can be important.

byannoni · 08-23-2012, 06:57 PM

Quote:

Originally Posted by chrism01

The ' - ' gives you user2's env, otherwise you keep your own ... This can be important.

Good point, forgot to mention that.

sahana12 · 08-24-2012, 12:58 AM

on client:
as root ran command:
mount -t nfs -o vers=3 <server-ip>:/hello /hello
cd /hello
ls -l
-rw-r--r-- 1 root root 12 Aug 23 01:46 userfile

now :
su - user
cd /hello

touch userfile
touch: cannot touch `userfile': Permission denied

Is this expected behaviour?

chrism01 · 08-24-2012, 05:53 AM

Depends who owns the mounted dir and perms.
Note also that nfs is done by uid, not username; the uid at both ends must match
See Chap 18 http://www.linuxtopia.org/online_boo...ion/index.html

byannoni · 08-24-2012, 07:41 AM

Quote:

Originally Posted by sahana12

-rw-r--r-- 1 root root 12 Aug 23 01:46 userfile

Code:

root root    means that root owns the file.
-rw-r--r--   means that only the owner has the permission to write to the file.

So you need to do this if you want user to be able to touch it:

Code:

chmod o+w userfile