What is Exportfs in Linux?

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 …

How do I get rid of Exportfs?

Unexporting an NFS file system

1. Open the /etc/exports file with your favorite text editor.
2. Find the entry for the directory you wish to unexport, and the delete that line.
3. Save and close the /etc/exports file.
4. If NFS is currently running, enter: exportfs -u dirname.

What is var lib NFS ETAB?

An NFS server maintains a table of local physical file systems that are accessible to NFS clients. The exportfs command maintains the current table of exports for the NFS server. The master export table is kept in a file named /var/lib/nfs/etab. This file is read by rpc. mountd when a client sends an NFS MOUNT request.

How do I export a file system in Linux?

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. On each client system, you use the mount command to mount the directories that your server exported.

What is use of mount command in Linux?

The mount command serves to attach the filesystem found on some device to the big file tree. Conversely, the umount(8) command will detach it again. The filesystem is used to control how data is stored on the device or provided in a virtual way by network or other services.

How do I find exports in Linux?

To display all the exported environment variable of the current shell, execute the command with -p option as follows: export -p.

What is Linux NFS?

What is Linux NFS Server? Network File Sharing (NFS) is a protocol that allows you to share directories and files with other Linux clients over a network. Users add files to them, which are then shared with other users who have access to the folder.

What is port 111 used for?

Side note: UDP port 111 uses the Datagram Protocol, a communications protocol for the Internet network layer, transport layer, and session layer. This protocol when used over PORT 111 makes possible the transmission of a datagram message from one computer to an application running in another computer.

How does exportfs work in Linux 2.6?

If this filesystem is not mounted in 2.6, the legacy mode is used. In the new mode, exportfs does not give any information to the kernel but only provides it to mountd through the /var/lib/nfs/xtab file. mountd will listen to requests from the kernel and will provide information as needed.

Where do I Mount exportfs in Linux 2.4?

exportfs and its partner program rpc.mountd work in one of two modes: a legacy mode which applies to 2.4 and earlier versions of the Linux kernel, and a new mode which applies to 2.6 and later versions, providing the nfsd virtual filesystem has been mounted at /proc/fs/nfsd or /proc/fs/nfs.

How to invoke exportfs-Unix, Linux command?

When displaying the current export list, also display the list of export options. The first synopsis shows how to invoke the command when adding new entries to the export table. When using exportfs -a, all directories in exports (5) are added to xtab and the resulting list is pushed into the kernel.

How to remove an export file in Linux?

When using exportfs -ua, all entries listed in /var/lib/nfs/etab are removed from the kernel export tables, and the file is cleared. This effectively shuts down all NFS activity. To remove an export, specify a host:/path pair. This deletes the specified entry from /var/lib/nfs/etab and removes the corresponding kernel entry (if any).