Question

NFS Mount - How Can I grant read/write acess to a specific user?

Asked by: dpora1979

Hello,

I'm having issues granting read/write access to a specific user from my NFS share.

Case1:
share -F nfs -o rw /data/oracle/restore
mount -F nfs remotesvr:/data/oracle/restore /data/oracle/recovery

This works but I'm unable to create files or folders with my "oracle" user. Oracle is the folder owner on both servers!

Case2:
share -F nfs -o rw=oracle /data/oracle/restore - works!
mount -F nfs remotesvr:/data/oracle/restore /data/oracle/recovery - error!!!!!!

***nfs mount: mount: /data/oracle/oradata/restore: Permission denied***

How do I resolve this issue and allow my oracle user to have full access to the shares????



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Asked On
2009-09-01 at 10:22:39ID24698701
Topics

NFS File Server

,

Unix Networking

Participating Experts
2
Points
50
Comments
7

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Answers

 

by: nociPosted on 2009-09-01 at 12:31:10ID: 25235069

check what is in /etc/exports file:
on remotesvr,

there should be an entry like
/data...  yourhostname(rw)

if not then that probably is a problem (Oh and you need to do the mount as oracle user, not root).

 

by: dpora1979Posted on 2009-09-01 at 12:59:24ID: 25235323

This is on a Sun Solaris 10 system.

/etc/exports doesn't exist.

When I try and mount as oracle I get the following error:
nfs mount: insufficient privileges

 

by: nociPosted on 2009-09-01 at 14:25:01ID: 25236337

if the /etc/exports file does not exits then there are no exports.
Please read up on the following;
http://www.linuxdocs.org/HOWTOs/NFS-HOWTO/interop.html

the layout of the linux & sunos version are the same.

if the root account is used to mount then the root user will enter the remote system as nobody. (this is a safety precaution).
See man 5 exports for details.

 

by: dpora1979Posted on 2009-09-01 at 14:54:26ID: 25236545

The issue is that the user ids for the "oracle" user is different on each server. I noticed this when I created my mount on the remote server. Is there anyway to get around this issue?

 

by: nociPosted on 2009-09-01 at 17:25:13ID: 25237337

No,
This is the exact reason why Sun designed NIS (kind of very very basic LDAP) so all identities in the network are the same....

you could change File ownership using find , replace the OldUid & NewUid

find /data/oracle -user OldUid -exec chown NewUid '{}' \;

BTW the same applies to group.

If the uid is used inside the database this also needs some updating.

 

by: nemws1Posted on 2009-09-01 at 17:56:28ID: 25237448

BTW, on Solaris 10, shares are defined in /etc/dfs/dfstab, not /etc/exports.  It does the same thing, but the implementation is quite different.

On Linux, you can use a trick to map *any* connecting user to the uid you want (anon flag), but that's pretty dangerous and undesirable.

Follow noci's advice (although I'd add the -h flag to chown so linked-to files can't get screwed up) to change the uid and gid on the *mounting* server, along with the relevant entries in /etc/passwd & /etc/group.

For example, the server were you've set up the shares, the 'oracle' user has a uid & gid of 1010.  On the new/mounting server, user 'oracle' has a uid & gid of 1040, you need to switch over everything to uid/gid 1010:

find /data/oracle -user 1040 -exec chown -h 1010 '{}' \;
find /data/oracle -group 1040 -exec chgrp -h 1010 '{}' \;
find /tmp -user 1040 -exec chown -h 1010 '{}' \;
find /tmp -group 1040 -exec chgrp -h 1010 '{}' \;
find /var/tmp -user 1040 -exec chown -h 1010 '{}' \;
find /var/tmp -group 1040 -exec chgrp -h 1010 '{}' \;
vi /etc/passwd   (change the two "1040"s in user oracle's line to "1010")
vi /etc/group     (change the one occurrence of "1040" in group oracle's line to "1010")

Kill any processes user 'oracle' may be running on the new/mounting server (reboot if possible - not necessary, but if you don't know what's going on on your system, its the best thing to do).

If you change all this on the new/mounting server, you shouldn't need to make any changes on the original/sharing server to the oracle tables.

NOTE - if the uid/gid of oracle is already being used on the new server (in my example, uid/gid 1010 is already used, let's say be user "bob"), then you'll most like have to change *that* user's files and system files (in /etc) to an unused uid before you do all this.  Otherwise, user "bob" might be able to access all of the oracle data.

 

by: dpora1979Posted on 2009-09-02 at 06:52:02ID: 25241031

Thanks for the help guys!

This is way to much trouble for what I'm attempting to do. I will just share with the root user option and put this to bed. RSYNC will handle the everything from there.

20120131-EE-VQP-002

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