[Xymon] mounted NFS volumes not included in disk utilization graphs

[Paul Grondahl]

Thanks all for your detailed responses. I will just monitor the NFS host.


> On Apr 1, 2015, at 6:41 PM, Malcolm <fragbaitmm at gmail.com> wrote:
> 
> At my work, my team developed some "safe" coding to list NFS filesystems in df.
> It uses the showmount command to list exports on the NFS server - if this succeeds, it should be safe to run df on the filesystem.
> 
> The comment in the code references the URL http://osdir.com/ml/monitoring.hobbit/2007/msg02373.html but it doesn't seem to exist now.
> 
> It's ugly and no doubt could be cleaned up and improved...
> but it does work, and it's handy to know which clients are affected when a NFS volume becomes full.
> 
> Update to xymonclient-linux.sh :
> ================================
> At the end of the code for "df", add these lines :
> 
> # --- Start - Addition code, to check nfs mounts ---
> # Added following code, based on http://osdir.com/ml/monitoring.hobbit/2007/msg02373.html
> #
> /bin/bash -c "/bin/egrep $'[ \t]nfs[ \t]' /etc/mtab" | \
>  /bin/egrep -v "ignore|indirect" | \
>  /usr/bin/awk '{print $1, $2}' | \
>  while read line
>  do
>  set -- $line
>    NFSHOST=`echo $1 | /usr/bin/awk -F: '{print $1}'`
>    SHARE=`echo $1   | /usr/bin/awk -F: '{print $2}'`
>    /bin/ping $NFSHOST -c 5 >/dev/null 2>&1
>    if [ $? -ne 0 ]
>    then
>      echo "$1 IS NOT RESPONDING(ping_failed) 999% $2"
>    else
>      # Ensure NFS connection is active BEFORE running the "showmount -e" command.
>      /bin/df -k $2 > /dev/null 2>&1 & /bin/sleep 5 ; kill $! > /dev/null 2>&1
>      /usr/sbin/showmount -e $NFSHOST >/dev/null 2>&1
>      if [ $? -ne 0 ]; then
>        echo "$1 IS NOT AVAILABLE(showmount_failed) 999% $2"
>      else
>        /usr/sbin/showmount -e $NFSHOST | /bin/egrep "^$SHARE " >/dev/null 2>&1
>        if [ $? -ne 0 ]; then
>          # Remove "/share" prefix as required for QNAP NFS servers
>          SHARE1=${SHARE#/share}
>          /usr/sbin/showmount -e $NFSHOST | /bin/egrep "^$SHARE1 " >/dev/null 2>&1
>        fi
>        if [ $? -ne 0 ]; then
>          echo "$1 IS NOT AVAILABLE(showmount_failed_to_find_share) 999% $2"
>        else
>          /bin/df -kP $2 | tail -n +2
>        fi
>      fi
>    fi
>  done
> # --- End of - Addition code, to check nfs mounts ---
> 
> 
> Regards
> Mal
> 
> On 02/04/15 07:13, Henrik Størner wrote:
>> Den 31-03-2015 kl. 00:49 skrev Paul Grondahl:
>>> On several systems with NFS mounts, the mounted volumes are not
>>> included in the disk utilization graphs. The volumes are visible in
>>> the client data. How does one get them included in the graphs?
>> There is a potential problem with including network disks in the "disk"
>> status: If your network connection to the NFS server dies, then the "df"
>> command is likely to stall. So you won't get any client data sent over
>> to the Xymon server, and your entire server goes purple.
>> 
>> That is why the Xymon client uses the "-l" (local) flag for df to NOT
>> report on network filesystems.
>> 
>> 
>> Regards,
>> Henrik
>> 
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> 
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