What is Crossmnt in NFS?

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)

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?

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

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 the etc exports file?

The /etc/exports file indicates all directories that a server exports to its clients. Each line in the file specifies a single directory. A directory can be specified twice in the /etc/exports file: once for NFS version 2 or NFS version 3, and once for NFS version 4.

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What is NFS port number?

Port 111 (TCP and UDP) and 2049 (TCP and UDP) for the NFS server. There are also ports for Cluster and client status (Port 1110 TCP for the former, and 1110 UDP for the latter) as well as a port for the NFS lock manager (Port 4045 TCP and UDP).

Where is NFS config file?

Configuring a system to share files and directories using NFS is straightforward. Every filesystem being exported to remote users via NFS, as well as the access rights relating to those filesystems, is located in the /etc/exports file.

What does No_root_squash mean?

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.

How do I know if NFS server is exporting?

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.

How do I change permissions in NFS share?

On the UNIX NFS client:

  1. Log on as root (only root can mount an NFS export). …
  2. Check the permissions by typing: …
  3. Assign the appropriate owners to the files and folders by typing: …
  4. Assign appropriate permissions to the files and folders by typing: …
  5. Verify the new permissions by typing:


What is the role of sync option for NFS server?

Most people use the synchronous option on the NFS server. For synchronous writes, the server replies to NFS clients only when the data has been written to stable storage. Many people prefer this option because they have little chance of losing data if the NFS server goes down or network connectivity is lost.

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What is RPC and its role in NFS?

NFS achieves this independence using the Remote Procedure Call (RPC) protocol. RPC is a library of procedures. The procedures allow one process (the client process) to direct another process (the server process) to run procedure calls as if the client process had run the calls in its own address space.

What is the name of the option that disables 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. NFS commands executed as the root user on the client will be considered as originating from the “anonymous” user.

How do I view NFS exports?

Viewing the Exported NFS and CIFS Shares

  1. To view the list of exported NFS and CIFS shares on the 3DFS server, on the command line, enter the following command: # showmount -e.
  2. To view the list of exported NFS and CIFS shares on the NFS-Ganesha server, on the command line, enter the following command:

How do I set etc exports?


  1. Open the /etc/exports file in a text editor on an NFS client that has root access to the storage system.
  2. Make your changes.
  3. Save the file.

What is the purpose of the ETC exports file?

The /etc/exports file controls which file systems are exported to remote hosts and specifies options.

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