What does the Exportfs command do?

Table of Contents

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 does NFS check exports?

NFS clients can use the showmount -e command to see a list of exports available from an ONTAP NFS server. This can help users identify the file system they want to mount.

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).

How do you reexport NFS in AIX?

Procedure

Take the backup of the exports file:
Create an entry for each directory to be exported, using the full path name of the directory:
Read the /etc/exports file and export all the directories listed:
Confirm the exported directory listed:
Confirm the nfs client name and directory list:

How can I tell if NFS server is running?

To verify that NFS is running on each computer:

AIX® operating systems: Type the following command on each computer: lssrc -g nfs The Status field for NFS processes should indicate active .
Linux® operating systems: Type the following command on each computer: showmount -e hostname.

How do you check if NFS share is available in Linux?

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 know if NFS is working?

How do I check NFS mount connectivity?

How to Check Connectivity on an NFS Client

On the client, check that the NFS server is reachable.
If the server is not reachable from the client, ensure that the local name service is running on the client.
If the name service is running, ensure that the client has received the correct host information.

What is All_squash in NFS?

On the Linux NFS server (not Data ONTAP), the all_squash option makes the server disregard the incoming NFS User Identifier/ Group Identifier (UID/ GID) and allows the server to be set in the exports instead.

What is root squash in NFS?

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 mount NFS in AIX server?

Mounting an NFS file system on AIX

3.6. From the root prompt command line of the host server, type mkdir /mnt/<local directory path> (or mount point) to create a mount point and press Enter. Type ping <NFS server address> and press Enter.

How do I unmount NFS filesystem in AIX?

To remove a predefined NFS mount by editing the /etc/filesystems file:

Enter the command: umount /directory/to/unmount .
Open the /etc/filesystems file with your favorite editor.
Find the entry for the directory you just unmounted, and then delete it.
Save and close the file.

How do I automatically start NFS server?

By default, the nfs service does not start automatically at boot time. To configure the NFS to start up at boot time, use an initscript utility, such as /sbin/chkconfig, /sbin/ntsysv, or the Services Configuration Tool program.

How do I check my NFS share?

We can use showmount command to show NFS shares on the NFS Server using NFSv3 protocol. IMPORTANT NOTE: showmount can be used to show NFS shares only if you are using rpcbind . With NFSv4, rpcbind is not used any more so showmount will throw clnt_create: RPC: Program not registered error on NFSv4 server configuration.

How do I start NFS service?

What ports do I need to open for NFS?

NFS uses port 2049. NFSv3 and NFSv2 use the portmapper service on TCP or UDP port 111. The portmapper service is consulted to get the port numbers for services used with NFSv3 or NFSv2 protocols such as mountd, statd, and nlm.

How do I troubleshoot NFS mount issue?

Solution

Ensure that the NFS server is running correctly on all of the CES nodes and that the CES IP address used to mount is active in the CES cluster.
Ensure that the firewall allows NFS traffic to pass through.
Verify that the NFS client is allowed to mount the export.

How can I tell if NFS is working?

What is Subtree_check in NFS?

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.

Does NFS require authentication?

When Kerberos authentication is the only allowed security method for an exported directory, the NFS client session must be properly authenticated before gaining access to any of the data in that directory. NFS V4 normally authenticates clients at the user level rather than at the host level.

What is the difference between root squash and No_root_squash in NFS?

root_squash prevents remote root users from having superuser (root) privileges on remote NFS-mounted volumes. 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 ports are needed for NFS?

NFS uses port 2049. NFSv3 and NFSv2 use the portmapper service on TCP or UDP port 111.

How do I manually mount NFS?

Manually Mounting an NFS File Systems

First, create a directory to serve as the mount point for the remote NFS share: sudo mkdir /var/backups.
Mount the NFS share by running the following command as root or user with sudo privileges: sudo mount -t nfs 10.10.0.10:/backups /var/backups.

How do I mount a NAS file in AIX?

Select Network File System (NFS). Select Network File System (NFS) again. Select Remove a Directory from Exports List. Enter the CD-ROM mount point directory (such as /cdrom) in the PATHNAME of exported directory to be removed field and click OK.