Difference between revisions of "Traffic accounting through proc"
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# cat << EOF >> /etc/crontab | # cat << EOF >> /etc/crontab | ||
| − | */5 * * * * | + | */5 * * * * /path/to/script/vz_direct_traffic_log |
| − | */30 * * * * | + | */30 * * * * /path/to/script/vz_direct_traffic_render |
EOF | EOF | ||
| Line 91: | Line 91: | ||
# cat << EOF > /etc/vz/cron/vz-traffic.sh | # cat << EOF > /etc/vz/cron/vz-traffic.sh | ||
| − | */5 * * * * | + | */5 * * * * /path/to/script/vz_direct_traffic_log |
| − | */30 * * * * | + | */30 * * * * /path/to/script/vz_direct_traffic_render |
EOF | EOF | ||
# /etc/init.d/vz update-cron | # /etc/init.d/vz update-cron | ||
Revision as of 21:30, 20 November 2012
Traffic Accounting through /proc/net/dev
Introduction
Traffic accounting in OpenVZ can be done through data collection against
/proc/net/dev in the individual containers on a HN.
Prerequisites
- OpenVZ
- RRDTool
- GNU AWK
Script
First create a directory to store your RRD files:
# mkdir /var/lib/rrd/
Then install this script:
#!/bin/sh
# Script Name: vz_direct_traffic_log
# Author: "Brian Harrington, Alticon Inc" <bharrington@alticon.net>
# Website: htty://www.alticon.net
# Editor: "Denis Titov, ISP Okeanika" <denis@okeanika.net.ua>
# Time to do the data collection.
for veid in $(/usr/sbin/vzlist -o veid -H)
do
RRDFILE="/var/lib/rrd/$veid.rrd"
if ! test -e $RRDFILE; then
echo $RRDFILE does not exist, creating.
# Place your preferred RRD Creation command here
# or use this one, following command will create new RRD file with 300 sec step (for 5 min cron)
/usr/bin/rrdtool create $RRDFILE --step 300 \
DS:IN:COUNTER:1000:0:U \
DS:OUT:COUNTER:1000:0:U \
RRA:AVERAGE:0.5:1:600000 \
RRA:AVERAGE:0.5:100:60000 \
RRA:AVERAGE:0.5:1000:6000
fi
# Parse out the inbound/outbound traffic and assign them to the corresponding variables
eval `/usr/sbin/vzctl exec $veid "grep venet0 /proc/net/dev" | \
awk -F: '{print $2}' | awk '{printf"CTIN=%s\nCTOUT=%s\n", $1, $9}'`
# Send the data to the corresponding RRD time with (N)now as the update time
/usr/bin/rrdtool update $RRDFILE N:$CTIN:$CTOUT
done
the following script uses previously generated RRDs, you'll get nice PNG pictures and index.html file with them:
#!/bin/sh
# Script Name: vz_direct_traffic_render
# Author: "Denis Titov, ISP Okeanika" <denis@okeanika.net.ua>
# Website: http://www.okeanika.net.ua
rrd_path=/var/lib/rrd
www_path=/var/www/html/traf
cd $rrd_path
for RRD in *.rrd
do
CTID=$(echo $RRD | sed 's/.rrd$//')
# list of intervals, 1d = last day, 1w = last week and so on
for INT in 1h 1d 1w 1m 1y
do
/usr/bin/rrdtool graph ${www_path}/${CTID}-${INT}.png \
--start now-$INT --end now \
-w 1000 -h 500 \
--title "CTID $CTID - Interval $INT" \
DEF:in=$RRD:IN:AVERAGE AREA:in#aea:'IN' LINE1:in#0e0 \
DEF:out=$RRD:OUT:AVERAGE AREA:out#eaa:'OUT' LINE1:out#e00
echo "<p><img src=\"${CTID}-${INT}.png\"><br/><br/></p>" >> ${www_path}/index.html
done
doneSetup
Add this to cron to run vz_direct_traffic_log every 5 minutes and vz_direct_traffic_render every 30 minutes:
# cat << EOF >> /etc/crontab */5 * * * * /path/to/script/vz_direct_traffic_log */30 * * * * /path/to/script/vz_direct_traffic_render EOF
Alternatively, use the cron system of OpenVZ
# cat << EOF > /etc/vz/cron/vz-traffic.sh */5 * * * * /path/to/script/vz_direct_traffic_log */30 * * * * /path/to/script/vz_direct_traffic_render EOF # /etc/init.d/vz update-cron
To check the output of this later run:
# rrdtool fetch /var/lib/rrd/<veid>.rrd AVERAGE -s -3600
