You asked: What is the functionality of export file in NFS?

Description. The /etc/exports file contains an entry for each directory that can be exported to NFS clients. This file is read automatically by the exportfs command. If you change this file, you must run the exportfs command before the changes can affect the way the daemon operates.

What is NFS export?

NFS is the most common protocol for sharing files between Unix systems over a network. NFS servers export directories from their local hard disks to NFS clients, which mount them so that they can be accessed like any other directory.

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.

How do I export a directory in NFS?

Exporting an NFS file system

  1. Open the /etc/exports file with your favorite text editor.
  2. Create an entry for each directory to be exported using the full path name of the directory. List each directory to be exported starting in the left margin. …
  3. Save and close the/etc/exports file.
  4. If NFS is running, type the following command and press Enter:
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What are different options used in etc exports file in NFS?

There are many different NFS sharing options, including these:

  • rw: Share as read-write. …
  • ro: Share as read-only.
  • sync: File data changes are made to disk immediately, which has an impact on performance, but is less likely to result in data loss. …
  • async: The opposite of sync; file data changes are made initially to memory.

What is NFS and how it works?

NFS, or Network File System, was designed in 1984 by Sun Microsystems. This distributed file system protocol allows a user on a client computer to access files over a network in the same way they would access a local storage file. Because it is an open standard, anyone can implement the protocol.

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 set etc exports?

Steps

  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 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 refresh etc exports?

The /etc/exports Configuration File. When issued manually, the /usr/sbin/exportfs command allows the root user to selectively export or unexport directories without restarting the NFS service. When given the proper options, the /usr/sbin/exportfs command writes the exported file systems to /var/lib/nfs/xtab.

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How would you use NFS to share a directory?

Sharing files through NFS is simple and involves two basic steps: On the Linux system that runs the NFS server, you export (share) one or more directories by listing them in the /etc/exports file and by running the exportfs command. In addition, you must start the NFS server.

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).

Which one of the following is NFS configuration file?

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. This file is read by the exportfs command to give rpc.

Red Hat Linux 7.3: The Official Red Hat Linux Reference Guide
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What is export file in Linux?

export is bash shell BUILTINS commands, which means it is part of the shell. It marks an environment variables to be exported to child-processes. … The export command, on the other hand, provides the ability to update the current shell session about the change you made to the exported variable.

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.

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