Question: What is All_squash in NFS?

The “all_squash” option maps all client requests to a single anonymous uid/gid on the NFS server, negating the ability to track file access by user ID.

What is No_all_squash?

no_all_squash: This is similar to no_root_squash option but applies to non-root users. Imagine, you have a shell as nobody user; checked /etc/exports file; no_all_squash option is present; check /etc/passwd file; emulate a non-root user; create a suid file as that user (by mounting using nfs).

What is meaning of no_root_squash in NFS?

no_root_squash allows root user on the NFS client host to access the NFS-mounted directory with the same rights and privileges that the superuser would normally have.

What is Fsid in NFS?

fsid=num|root|uuid. NFS needs to be able to identify each filesystem that it exports. Normally it will use a UUID for the filesystem (if the filesystem has such a thing) or the device number of the device holding the filesystem (if the filesystem is stored on the device).

What is No_subtree_check in NFS?

no_subtree_check This option disables subtree checking, which has mild security implications, but can improve reliability in some circumstances.

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How secure is NFS?

NFS itself is not generally considered secure – using the kerberos option as @matt suggests is one option, but your best bet if you have to use NFS is to use a secure VPN and run NFS over that – this way you at least protect the insecure filesystem from the Internet – ofcourse if someone breaches your VPN you’re …

What is Crossmnt?

Crossmnt allows the NFS client to traverse the directories below the exported root. For example: etc/exports: /exports *(fsid=0,ro,root_squash,sync) /exports/doc *(ro,root_squash,bind=/usr/share/doc)

How do I get rid of root squashing?

You can disable squashing by selecting No Root Squash in the Root squashing field of the Add NFS Client window.

What is no root squash?

No root-squash means that the root user will not be mapped to user nobody (this is normally done for security reasons) when mounting / accessing a NFS file system.

What is the name of the option that disable root squashing?

Some Linux NFS servers have an option called no_root_squash which disables the default behavior of squashing the root user. Root squashing is a security feature.

What is Exportfs?

exportfs stands for export file system, which exports file system to a remote server which can mount, and access it like a local file system. You can also unexport the directories using exportfs command.

What is subtree checking?

Disable subtree checking — If a subdirectory of a file system is exported, but the entire file system is not exported, the server checks to see if the requested file is in the subdirectory exported. This check is called subtree checking.

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How use Exportfs Linux?

Linux Beginners Guide to NFS Mount Using Exportfs

  1. Export File System to Remote Server using exportfs. …
  2. Mount Remote Server File System as a Local Storage. …
  3. Unmount Remote File System. …
  4. Unexport the File System. …
  5. Make NFS Export Permanent Across System Reboot. …
  6. Make the Mount Permanent Across Reboot.

What is Exportfs in Linux?

Description. The exportfs command makes local directories available for Network File System (NFS) clients to mount. This command is normally invoked during system startup by the /etc/rc. nfsfile and uses information in the /etc/exports file to export one or more directories, which must be specified with full path names …

What is Nfsnobody user Linux?

nfsnobody is the ‘System Account’ that manages all of the anonymous files created by NFS clients.

How does NFS check exports?

Run the showmount command with the server name to check which NFS exports are available. In this example, localhost is the server name. The output shows the available exports and the IP which they are available from.