How to access file path from another server? Post: 302984709

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Top Forums UNIX for Beginners Questions & Answers How to access file path from another server? Post 302984709 by bdittmar on Sunday 30th of October 2016 09:24:48 AM

10-30-2016

Registered User

Root squash

Quote:

Originally Posted by alvinoo

Hi Aia,

So that means I just need to call /share from another node within the same subnet and it will work for your nfs sharing mode method?

---------- Post updated at 05:57 AM ---------- Previous update was at 01:54 AM ----------

Hi there,

Is it possible to specific the NFS security restricted to particular host and by UID and GID?

Another thing is what is the difference between root squashing, nosuid, noexec options?

How do I access through UID and GID through manipulation?

Hello,

Root squash

Root squash is a reduction of the access rights for the remote superuser (root) when using identity authentication
(local user is the same as remote user). It is primarily a feature of NFS but may be available on other systems as well.

This problem arises when a remote file system is shared by multiple users. These users belong to one or multiple groups.
In Unix, every file and folder normally has separate permissions (read, write, execute) for the owner
(normally the creator of the file), for the group to which the owner belongs, and for the "world" (all other users).
This allows restriction of read and write access only to the authorized users while in general the NFS server must also be protected by firewall.

A superuser has more rights than an ordinary user, being able to change the file ownership, set arbitrary permissions, and
access all protected content. Even users that do need to have root access to individual workstations may not be authorized
for the similar actions on a shared file system. Root squash reduces rights of the remote root, making one no longer superuser.
On UNIX like systems, root squash option can be turned on and off in /etc/exports file on a server side.

After implementing the root squash, the authorized superuser performs restricted actions after logging into an NFS server directly
and not just by mounting the exported NFS folder.

2nd:
the nosuid, noexec and others are options which you can pass to the mount command (which performs the actual mounting).

Regards

bdittmar

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LEARN ABOUT V7

mount.nfs

MOUNT.NFS(8)						      System Manager's Manual						      MOUNT.NFS(8)

NAME

       mount.nfs, mount.nfs4 - mount a Network File System

SYNOPSIS

       mount.nfs remotetarget dir [-rvVwfnsh ] [-o options]

DESCRIPTION

       mount.nfs is a part of nfs(5) utilities package, which provides NFS client functionality.

       mount.nfs  is  meant to be used by the mount(8) command for mounting NFS shares. This subcommand, however, can also be used as a standalone
       command with limited functionality.

       remotetarget is a server share usually in the form of servername:/path/to/share.  dir is the directory on which the file system	is  to	be
       mounted.

       Under  Linux  2.6.32  and  later  kernel  versions, mount.nfs can mount all NFS file system versions.  Under earlier Linux kernel versions,
       mount.nfs4 must be used for mounting NFSv4 file systems while mount.nfs must be used for NFSv3 and v2.

OPTIONS

       -r     Mount file system readonly.

       -v     Be verbose.

       -V     Print version.

       -w     Mount file system read-write.

       -f     Fake mount. Don't actually call the mount system call.

       -n     Do not update /etc/mtab.	By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip making
	      an entry.

       -s     Tolerate sloppy mount options rather than fail.

       -h     Print help message.

       nfsoptions
	      Refer to nfs(5) or mount(8) manual pages.

NOTE

       For further information please refer nfs(5) and mount(8) manual pages.

FILES

       /etc/fstab	 file system table

       /etc/mtab	 table of mounted file systems

SEE ALSO

       nfs(5), mount(8),

AUTHOR

       Amit Gud <agud@redhat.com>

								    5 Jun 2006							      MOUNT.NFS(8)