How to get a list of clients connected to an NFS server on a local network?

Question

I have an NFS server with folder permissions as follows. There are 50 clients who need to connect to this server on the same network. I would like to know which command to look for, which clients access this server from the server.

The NFS Server configuration file is as follows.

[root@server ~]# cat /etc/exports
/home/guests    *(rw,sync)
/india          *(rw,sync)

Below is a list of shared folders

[root@server ~]# showmount -e
Export list for server.sanith.com:
/india       *
/home/guests *

For testing purposes, I have now connected one client to the server. The output below is from the client2 machine.

[root@client2 ~]# showmount -e 192.168.1.10
Export list for 192.168.1.10:
/india       *
/home/guests *
[root@client2 ~]# mount -t nfs 192.168.1.10:/india /test
[root@client2 ~]# mount
/dev/sda2 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda1 on /boot type ext4 (rw)
/dev/sda3 on /home type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
gvfs-fuse-daemon on /root/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
192.168.1.10:/india on /test type nfs (rw,vers=4,addr=192.168.1.10,clientaddr=192.168.1.12)

I tried to use showmount -aand showmount -d, but I'm not sure what is missing to not list client computers.

[root@server ~]# showmount -a
All mount points on server.sanith.com:
[root@server ~]# man showmount
[root@server ~]# showmount -d
Directories on server.sanith.com:
[root@server ~]# netstat -an | grep 192.168.1.10:2048
[root@server ~]# netstat -an | grep 192.168.1.10:2049
[root@server ~]# cat /var/lib/nfs/rmtab
[root@server ~]#

Note. The firewall is temporarily disabled on the server during this test. Please inform.

Answer 1

NFS, NFS :

netstat | grep :nfs

Answer 2

netstat -a | grep nfs

Ubuntu GNOME 16.04.

Answer 3

Since it is netstatnot always available to replace it with ss, you can also use

ss -a|grep nfs

Answer 4

Starting with the Linux 5.3 kernel, you can use a special directory called /proc/fs/nfsd/clients.

You can check the kernel version with the command uname -r