Check from Client if NFS is running on Server
Solution 1
If you have a standard setup, the NFS daemon on the server will be listening on TCP/UDP port 2049, so you can try to connect to it using netcat
, ncat
, nc
or even telnet
. I'm not running CentOS, so I can't tell exactly what you have available, but on my machine (OpenBSD)
$ nc -z ip_of_nfs_server 2049
does the trick (add -u
for UDP, the -z
switch tells it to check for listening daemons without sending data). Check the man
pages for what you have on your machine to achieve the same with other tools. telnet
is more or less ubiquitous so
$ telnet ip_of_nfs_server 2049
should also work (exit with Ctrl+c
).
Solution 2
showmount
from man showmount
showmount - show mount information for an NFS server
I use with --exports
( or -e
) option to see what is actually exported.
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Stanton
Updated on September 18, 2022Comments
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Stanton almost 2 years
(my systems are running centos7)
I'm trying to check from the client if drives are mounted properly over NFS.
Typing the command
nfsstat -m
gives me the mounts that it thinks are currently mounted, but this is no guarantee that those folders are accessible. It could just be that the nfs server was running when those folders were mounted but that the nfs server is down now.For example if the nfs server goes down and on the client machine I type
df -h
then the command will hang indefinitely. Likewise, if I try tols
the folder I'm trying to mount then it too will hang indefinitely.Here's an example that shows my problem
# on server systemctl start nfs-server # on client mount node1:/mnt/images /mnt/images df -h #works fine here # on server systemctl stop nfs-server # on client nfsstat -m #shows the list of nfs mounts df -h #this command will hang ls /mnt/images #this command will hang
Any suggestions on how to test if from the client side if the NSF server is running or if the NSF mounted folders are accessible would be greatly appreciated.
UPDATE
If I run
showmount -e
on the server I get this output (note/mnt/images
and/mnt/rv_output
and/rv
are all folders I'm trying to mount from my client machines)/mnt/rv_output 192.168.81.0/24 /mnt/images 192.168.81.0/24 /rv 192.168.81.0/24
But I'm not interested in testing this connection on the Server, I want to test it on the client machines. If I run
showmount -e
on the client I get the same output irregardless of where the nfs-server has been activated from the Server computer.clin_create: RPC: Port mapper failure - Unable to receive: errno 111 (connection refused)
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meuh over 6 yearsYou are supposed to run
showmount -e server
on the client.
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Stanton over 6 yearsThis didn't help as it displays the same result on the Client machines whether the NFS-server was running or not on the Server machine. See my update.