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Full Discussion: Understanding local access to NFS export
Operating Systems Linux Red Hat Understanding local access to NFS export Post 302605067 by KickstartUF on Tuesday 6th of March 2012 02:44:18 PM
Old 03-06-2012
Understanding local access to NFS export
Hello,

I've inherited an NFS setup that allows external servers to write to an NFS share on a Centos box. Here is an example line from /etc/exports (there are four entries that only are different based on server IP adress).

/exports/foobar 10.3.14.15/255.255.255.255(rw,insecure,async,all_squash,anonuid=296,anongid=296)

(296="anonid" for both user and group)

Here's the entry from "exportfs -v":
/exports/foobar
10.3.14.15/255.255.255.255(rw,async,wdelay,insecure,root_squash,all_squash,no_subtree_check,anonuid=296,anongid =296)
The files and directories on that share are all owned by anonid:anonid.

I've had a request to make a local user (I'll call it "bobsmith") to the NFS server which will have full access to everything under "/exports/foobar/" (in order to perform cronned and manual clean-up tasks on the data).

I admit I am not very versed with NFS, but I'm good with Unix/Linux and usual permission assignment. I am just wary of changing permissions on the local directories and files to make this access possible to "bobsmith" for fear that it will affect or be affected by the changes done to data by remote access.

Any advice on this? Perhaps something simple I am missing in my knowledge?

Thanks!
 

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LEARN ABOUT OPENSOLARIS

unshare_nfs

unshare_nfs(1M) 					  System Administration Commands					   unshare_nfs(1M)

NAME

       unshare_nfs - make local NFS file systems unavailable for mounting by remote systems

SYNOPSIS

       unshare [-F nfs] pathname

DESCRIPTION

       The  unshare  command makes local file systems unavailable for mounting by remote systems. The shared file system must correspond to a line
       with NFS as the FSType in the file /etc/dfs/sharetab.

OPTIONS

       The following options are supported:

       -F    This option may be omitted if NFS is the first file system type listed in the file /etc/dfs/fstypes.

FILES

       /etc/dfs/fstypes

       /etc/dfs/sharetab

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWnfssu 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       nfsd(1M), share(1M), attributes(5)

NOTES

       If the file system being unshared is a symbolic link to a valid pathname, the canonical path (the path which  the  symbolic  link  follows)
       will be unshared.

       For  example,  if  /export/foo is a symbolic link to /export/bar (/export/foo -> /export/bar), the following unshare command will result in
       /export/bar as the unshared pathname (and not /export/foo):

	 example#  unshare -F nfs /export/foo

       For file systems that are accessed by NFS Version 4 clients, once the unshare is complete, all NFS Version 4 state  (open  files  and  file
       locks)  are  released and unrecoverable by the clients. If the intent is to share the file system after some administrative action, the NFS
       daemon (nfsd) should first be stopped and then the file system unshared. After the administrative action is complete, the file system would
       then be shared and the NFS daemon restarted. See nfsd(1M)

SunOS 5.11							    6 May 2003							   unshare_nfs(1M)
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