Show NFS shares | List NFS mount points | List NFS clients Linux

In this article I will share multiple commands and method to cover below topics:

  • Show NFS Shares configured on the NFS Server
  • List NFS mount points on the NFS Clients
  • List NFS Clients which are connected to the NFS Server

 

Show NFS shares on NFS Server

Use showmount to show NFS shares

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.
# showmount --exports
Export list for server1.example.com:
/nfs_shares  *
/priv_shares 192.168.0.0/255.255.255.0
/pub_shares  10.10.10.0/255.255.255.0

You can also give server details to show NFS shares for the respective server

# showmount --exports 10.10.10.2
Export list for 10.10.10.2:
/nfs_shares  *
/priv_shares 192.168.0.0/255.255.255.0

 

Use exportfs to show NFS shares

You can use exportfs to show NFS shares with all NFS versions. exportfs -v will show the currently shared directory lists with all the permissions per directory

# exportfs -v
/pub_shares     10.10.10.0/255.255.255.0(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,root_squash,no_all_squash)
/priv_shares    192.168.0.0/255.255.255.0(sync,wdelay,hide,no_subtree_check,sec=sys,ro,secure,root_squash,no_all_squash)
/nfs_shares     (sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)

 

Use master export file /var/lib/nfs/etab to show NFS shares

We use /etc/exports or /etc/exports.d to add any NFS share. Next when we refresh the list of shares using exportfs -r or exportfs -a, the shares list from /etc/exports and /etc/exports.d is updated in the master exports table /var/lib/nfs/etab.
WARNING: You should not edit /var/lib/nfs/etab file manually. You must always update shares under /etc/exports and /etc/exports.d

Check the content of /var/lib/nfs/etab to show NFS shares list and all the applied permission details

# cat /var/lib/nfs/etab
/priv_shares    192.168.0.0/255.255.255.0(ro,sync,wdelay,hide,nocrossmnt,secure,root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=65534,anongid=65534,sec=sys,ro,secure,root_squash,no_all_squash)
/pub_shares     10.10.10.0/255.255.255.0(rw,sync,wdelay,hide,nocrossmnt,secure,root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=65534,anongid=65534,sec=sys,rw,secure,root_squash,no_all_squash)
/nfs_shares     *(rw,sync,wdelay,hide,nocrossmnt,secure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=65534,anongid=65534,sec=sys,rw,secure,no_root_squash,no_all_squash)

 

List NFS mount points on NFS Clients

There are various commands and methods to list NFS mount points

Use mount to list NFS mount points

We can use mount command to list NFS mount points on nfs-client.

# mount | grep nfs
10.10.10.12:/nfs_shares on /mnt type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=10.10.10.16,local_lock=none,addr=10.10.10.12)

 

Use nfsstat to list NFS mount points

Normally we use nfsstat to get the NFS mount point usage and statistics. But we can also use nfsstat to list currently used NFS mount points on nfs-client.

# nfsstat --mounts
/mnt from 10.10.10.12:/nfs_shares
Flags: rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=10.10.10.16,local_lock=none,addr=10.10.10.12

 

Use /proc/mounts to list NFS mount points

We can also check the content of /proc/mounts to list NFS mount points on nfs-client

# cat /proc/mounts | grep nfs
10.10.10.12:/nfs_shares /mnt nfs4 rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=10.10.10.16,local_lock=none,addr=10.10.10.12 0 0

 

List NFS clients connected to NFS Server

Use netstat to list NFS clients connected to NFS server

netstat is used to list the listening TCP and UDP ports. In the example I have one NFS client connected to the NFS server on 1018 port

# netstat | grep :nfs
tcp        0      0 server1.example.com:nfs 10.10.10.16:1018        ESTABLISHED

 

Use ss to list NFS clients connected to NFS Server

ss id another utility to investigate sockets and is considered to be a replacement for netstat in future Linux releases. So we can also use ss command to list NFS clients connected to the NFS Server. Execute below command on the NFS server to list NFS clients.

# ss -a|grep :nfs
udp    UNCONN     0      0       *:nfs                   *:*
udp    UNCONN     0      0        [::]:nfs              [::]:*
tcp    LISTEN     0      64      *:nfs                   *:*
tcp    ESTAB      0      0      10.10.10.2:nfs          10.10.10.16:1018
tcp    LISTEN     0      64       [::]:nfs              [::]:*

In this example we have one NFS Client currently connected to the NFS server on port 1018.

 

Lastly I hope the steps from the article to show nfs shares on nfs server, list nfs mount points on nfs clients and list nfs clients connected to nfs server on Linux was helpful. So, let me know your suggestions and feedback using the comment section.

 

References:
List all the NFS shares using showmount

 

Related Searches: check nfs mount, list nfs shares, showmount command in linux, nfs client list remote exports, list nfs mount points

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