Is there a good way to detect a stale NFS mount

user_110488 0
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I have a procedure I want to initiate only if several tests complete successfully.

One test I need is that all of my NFS mounts are alive and well.

Can I do better than the brute force approach:

mount | sed -n "s/^.* on \(.*\) type nfs .*$/\1/p" | 
while read mount_point ; do 
  timeout 10 ls $mount_point >& /dev/null || echo "stale $mount_point" ; 
done

Here timeout is a utility that will run the command in the background, and will kill it after a given time, if no SIGCHLD was caught prior to the time limit, returning success/fail in the obvious way.

In English: Parse the output of mount, check (bounded by a timeout) every NFS mount point. Optionally (not in the code above) breaking on the first stale mount.

nfs shell unix linux bash
8 Answers

I'll just paste a snippet from our Icinga2 NFS stale mount monitoring Bash script here:

MOUNTS="$(mount -t nfs;mount -t nfs3;mount -t nfs4)"
MOUNT_POINTS=$(echo -e "$MOUNTS \n"|grep -v ^$|awk '{print $3}')

if [ -z "$MOUNT_POINTS" ]; then
        OUTPUT="[OK] No nfs mounts"
        set_result 0
else
        for i in $MOUNT_POINTS;do
                timeout 1 stat -t "$i" > /dev/null
                TMP_RESULT=$?
                set_result $TMP_RESULT
                set_output $TMP_RESULT "$i"
        done
fi
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