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Monitoring OpenVZ resources using munin [message #15122] Thu, 19 July 2007 12:37
Jan Tomasek is currently offline  Jan Tomasek
Messages: 44
Registered: December 2006
Member
From: openvz.org
Hello,

I wanted to monitor resource of my OpenVZ systems using Munin. I took
inspiration from wiki page:
http://wiki.openvz.org/Monitoring_openvz_resources_using_mun in
but I needed mixture of features from old and new version. Nice thing on
old version is possibility to draw multiple resources into one graph.
Bad thing was speed.

I have rewritten old version to use /proc/bc/<VEID>/resources, and did
some cleaning in code. Result is working nicely, you can see live output
at http://munin.cesnet.cz/munin/OpenVZ/index.html.

I was thinking how to group some resources, not saying that my decision
is best, but it works. I also prepared script ln-vebc which I run every
hour from cron to create new links for new VE and delete links for old
removed/stoped VE.

Both scripts are attached. If there is interest feel free put them on
wiki, I just don't want to put there 3rd version of same.

Best regards
--
-----------------------
Jan Tomasek aka Semik
http://www.tomasek.cz/

#!/bin/bash

FILE=`mktemp /tmp/ln-vebc-XXXXXX`

cd /etc/munin/plugins

for resources in kmemsize \
lockedpages_privvmpages_shmpages_physpages_vmguarpages_oomgu arpages \
numproc \
numtcpsock_numflock_numpty_numsiginfo_numothersock_numiptent \
tcpsndbuf_tcprcvbuf_othersockbuf_dgramrcvbuf \
dcachesize \
numfile
do
for VE in 0 `/usr/sbin/vzlist | sed "s/^ *//" |grep '^[0-9]' | cut -f 1 -d " "`
do
ln -sf /usr/local/share/munin/plugins/vebc_ "vebc_"$resources"_"$VE
echo "vebc_"$resources"_"$VE >> $FILE
done
done

# remove no longer deserved links (ie. links pointing to machines
# which were destroyed or stoped)

find -type l -name vebc_\* | sed "s/\.\///" | while read LN; do
if grep ^$LN$ $FILE >/dev/null; then
true
else
rm $LN
fi
done

rm $FILE#!/bin/sh
#
# Munin's plugin to monitor OpenVZ bean counters.
#
# $Log$
# Revision 1.3 2007/07/19 12:57:00 Jan Tomasek <jan@tomasek.cz>
# * rewrited to work with /proc/bc/<VEID>/resources instead of
# /proc/user_beancounters, that simplified code and result
# is also bit faster.
# * added references to OpenVZ wiki
#
# Original revision taken from:
# http://wiki.openvz.org/Monitoring_openvz_resources_using_mun in
#
#%# family=auto
#%# capabilities=autoconf suggest

VEID=`basename $0 | sed -e 's/^vebc_.*_//'`;
STATS=`basename $0 | sed -e 's/^vebc_//' -e 's/_[0-9]*$//' -e 's/_/ /g'`

if [ "$1" = "autoconf" ]; then
if [ -r /proc/bc/0/resources ]; then
echo yes
exit 0
else
echo "no (/proc/bc/0/resources not found)"
exit 1
fi
fi

if [ "$1" = "suggest" ]; then
if [ -r /proc/bc/0/resources ]; then
cat /proc/bc/0/resources |
while read str; do
vals=($str)
echo ${vals[0]}
done

exit 0
else
exit 1
fi
fi

if [ ! -f /proc/bc/$VEID/resources ]; then
exit 0;
fi

if [ "$1" = "config" ]; then
#echo "graph_order down up"
echo "graph_title VE$VEID: $STATS"
echo "graph_vlabel bean counters"
echo "graph_category VE$VEID"
# Note on URLs. General graph info is by munin version 1.2.5
# accepted even with HTML code. But for value.info it escapes URL,
# I expect that authors of munin will note that in future and put
# escaping even for graph.info.
echo "graph_info VE bean counters info. Documentation of the OpenVZ resource management is located at <a href=\"http://wiki.openvz.org/UBC\">http://wiki.openvz.org/UBC</a>."

cat /proc/bc/$VEID/resources | while read name value top warn max stuff ; do
for statname in $STATS; do
if [ "$name" == "$statname" ]; then
URL="http://wiki.openvz.org/$name"
if [ "$warn" == "0" ]; then
warn=$max
fi
echo $name.label $name
echo $name.warning $warn
echo $name.critical $max
echo $name.info Description of this resource is located at $URL
fi
done
done
fi;

cat /proc/bc/$VEID/resources | while read name value stuff ; do
for statname in $STATS; do
if [ "$name" == "$statname" ]; then
echo $name".value "$value;
fi
done
done
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