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xen-users
Re: [Xen-users] Monitor Network Traffic per Domain
Thanks, that will work perfectly!
-Mike
Carsten Tolkmit wrote:
Hi,
I was wondering if theres any way I can monitor total bytes sent
and recieved by a single Domain without installing anything on the
guestos itself. I´ve been trying out a few different options but
none seem to be working out. I´m using bridged networking, each
domain has a unique public IP.
You can see the totals per guest vif using either ifconfig or cat
/proc/net/dev
Ian
This works partially, but I need a way to monitor total usage over
time. So any script that relies on statistics from each vif will get
thrown off if I ever restart a domain or start them in a different
order.
yes - I had the same problem. So I came up with the following solution:
I installed the ifrename tool (ifrename package in debian) and I
changed the /etc/xen/scripts/vif-brige script in a way that it renames
the vif before adding it to the bridge with a name based on the last
byte of the mac address assigned to the virtual interface. My changes
look like this (unified diff):
----
v-server:/etc/xen/scripts# diff -U 3 vif-bridge,vanilla vif-bridge
--- vif-bridge,vanilla 2005-05-10 12:53:40.000000000 +0200
+++ vif-bridge 2005-05-10 13:06:03.000000000 +0200
@@ -34,7 +34,7 @@
# Exit if anything goes wrong
set -e
-echo "vif-bridge $*"
+echo "vif-bridge $*" | /usr/bin/tee -a /var/log/vif-bridge.log
# Operation name.
OP=$1
@@ -74,18 +74,25 @@
exit
fi
+export nvif=vif-mac-`echo ${mac} | /usr/bin/awk -F ':' '{ print $6 }'`
+
+if [ "$OP" == "up" ]; then
+ echo "request interface name ${nvif} instead of ${vif}" |
/usr/bin/tee -a /var/log/vif-bridge.log
+ /sbin/ifrename -i ${vif} -n ${nvif}
+fi
+
# Add/remove vif to/from bridge.
-brctl ${brcmd} ${bridge} ${vif}
-ifconfig ${vif} $OP
+brctl ${brcmd} ${bridge} ${nvif}
+ifconfig ${nvif} $OP
if [ ${ip} ] ; then
# If we've been given a list of IP networks, allow pkts with
these src addrs.
for addr in ${ip} ; do
- iptables ${iptcmd} FORWARD -m physdev --physdev-in ${vif} -s
${addr} -j ACCEPT
+ iptables ${iptcmd} FORWARD -m physdev --physdev-in ${nvif} -s
${addr} -j ACCEPT
done
# Always allow us to talk to a DHCP server anyhow.
- iptables ${iptcmd} FORWARD -m physdev --physdev-in ${vif} -p udp
--sport 68 --dport 67 -j ACCEPT
+ iptables ${iptcmd} FORWARD -m physdev --physdev-in ${nvif} -p udp
--sport 68 --dport 67 -j ACCEPT
fi
----
All you have to do is to assign mac addresses in the domains that
differ by last byte, and voila, you will get the same interface name
every time the domain is started.
But take care if you use tools that will try to compansate for counter
overflows, because if you stop and start a domain, the counters will
get reset.
I then use a snmpd running in Domain-0, so that my traffic collector
can collect traffic data the same way it does from our routers.
Best regards,
Carsten
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