How to list NFS exports on a server

When an NFS client cannot see a share or mounts it with unexpected permissions, the server-side export table shows what the server is actually prepared to share. Checking that table separates a missing active export from a client-side mount, DNS, firewall, or protocol-version problem.

Linux NFS servers read export definitions from /etc/exports and from matching drop-in files under /etc/exports.d. The exportfs command maintains the active export table, and exportfs -v displays each exported directory with the client selector and options that are loaded for that selector.

Run the server-side check before changing client mount files or firewall rules. A loaded export still has to match the network path, protocol version, filesystem permissions, and any UID/GID mapping, Kerberos, or TLS policy, but the active table is the fastest place to confirm that the server accepted the intended path, selector, and options.

1. Open a shell on the NFS server with an account that can use sudo.
2. List the active export table with verbose options.

   $ sudo exportfs -v
   /srv/nfs/projects
   		192.0.2.0/24(sync,wdelay,hide,no_subtree_check,sec=sys,rw,root_squash,no_all_squash)

   The first line is the local directory being exported. The indented line shows the client selector and the options currently loaded for that selector.

3. Confirm that the expected directory appears in the output.

   If the directory is missing from exportfs -v, clients cannot mount it from the active export table even if the path still exists on disk.

4. Confirm that the client selector matches the intended host, subnet, netgroup, or wildcard.

   A selector such as 192.0.2.0/24 covers that subnet. A hostname, single IP address, netgroup, or broad wildcard can appear instead depending on the export definition.

5. Check the loaded options for the access rule that matters to the client.

   Look for access and mapping options such as ro or rw, sync, root_squash, no_root_squash, and sec=. Defaults may appear in the active table even when the source file only lists the options that were changed from policy defaults.

6. Print the active export table in source-file style when comparing it with /etc/exports entries.

   $ sudo exportfs -s
   /srv/nfs/projects  192.0.2.0/24(sync,wdelay,hide,no_subtree_check,sec=sys,rw,root_squash,no_all_squash)

   exportfs -s displays the current export list in a format suitable for /etc/exports, which makes it easier to compare a loaded rule with saved export definitions.

7. Compare the loaded export with the saved definition file.

   $ cat /etc/exports.d/projects.exports
   /srv/nfs/projects 192.0.2.0/24(rw,sync,no_subtree_check,root_squash)

   exportfs reads /etc/exports and files under /etc/exports.d whose names end in .exports. Drop-in files with another suffix are ignored.

8. Reapply the saved export definitions only when the source file is correct but the active table is missing or stale.

   $ sudo exportfs -ra

   No output usually means exportfs accepted the definitions. Fix any reported syntax, missing-path, or unsupported-filesystem error before checking the table again.

   Related: How to reload NFS exports

9. Query from an allowed client after the server-side table is correct.

   $ showmount --exports files.example.net
   Export list for files.example.net:
   /srv/nfs/projects 192.0.2.0/24

   showmount depends on the mount discovery service and may not answer on NFSv4-only servers. Treat the server-side exportfs table as the first proof of what the server loaded, then run a real mount test when client access still needs validation.

   Related: How to list NFS exports from a client
   Related: How to mount an NFS export on Linux