[Xymon] monitoring aggregated network traffic

[Martin Flemming]

> On Sun, 30 Oct 2011, netz-haut - stephan seitz wrote:
>
>> Hi,
>> 
>> thanks for your very helpful answer.
>> It took me a few days to get back to that issue, so sorry for that late 
>> responose.
>> 
>> I've added additional lines for outgoing, and it works as expected.
>> 
>> I'm absolutely fine with hardcoed interfaces, cause I need the aggregated 
>> view of
>> particular interfaces.
>> 
>> 
>> Thanks again,
>> 
>> Stephan
>> 
>> 
>> 
>> 
>> Am Donnerstag, den 13.10.2011, 19:42 +0200 schrieb Henrik Størner:
>> 
>> 
>> On 13-10-2011 16:44, netz-haut - stephan seitz wrote:
>> 
>> > is there any "usual" way, to monitor and graph the traffic of a bulk
>> > of network interfaces? The reason is, some of our hosts are connected
>> > to iSCSI storages via multipath over two or four independent
>> > interfaces. Since the traffic is balanced equally, every interface
>> > shows (more or less) the same amount of traffic. This leads to very
>> > useless rrdtool graphics as there is only one multicolored thick line
>> > visible. It would be really helpful to see a graph which shows the
>> > SUM of the particular interfaces.
>> 
>> This can be done by creating an RRD graph definition to do the summation
>> for you.
>> 
>> In RRDtool, you first use one or more "DEF" lines to grab specific data
>> items from one or more RRD files, and put them into some "variables".
>> You can then either use these variables directly to make a line on the
>> graph, or you can use them for calculating other variables via a "CDEF"
>> line.
>> 
>> The default ifstat graph has these lines:
>>
>>          DEF:inbytes at RRDIDX@=@RRDFN@:bytesReceived:AVERAGE
>>          CDEF:in at RRDIDX@=inbytes at RRDIDX@,8,*
>> 
>> (The @RRDIDX@ and @RRDFN@ are because this graph repeats over all the
>> interfaces - Xymon replaces these with a number and the RRD filename).
>> 
>> What this does is to first define a variable "inbytes at RRDIDX@" which has
>> the "bytesReceived" value from the RRD. The it computes another
>> variable, "in at RRDIDX@" as 8*inbytes - to convert from bytes to bits.
>> The notation here is Reverse Polish (RPN).
>> 
>> So if you have 4 RRD files, one for each interface, you can have RRDtool
>> do the math for you like this:
>> 
>> [ifsum]
>>          TITLE Network Traffic
>>          YAXIS Bits/second
>>          DEF:inbytes0=ifstat.eth0.rrd:bytesReceived:AVERAGE
>>          DEF:inbytes1=ifstat.eth1.rrd:bytesReceived:AVERAGE
>>          DEF:inbytes2=ifstat.eth2.rrd:bytesReceived:AVERAGE
>>          DEF:inbytes3=ifstat.eth3.rrd:bytesReceived:AVERAGE
>>          CDEF:intotal=inbytes0,inbytes1,inbytes2,inbytes3,+,+,+
>>      CDEF:inbits=intotal,8,*
>>      LINE:inbits#FF0000:Aggregate inbound
>> 
>> The "LINE" definition then uses the "inbits" value to draw a (red) line
>> with this data.
>> 
>> Have a look at graphs.cfg, and I'm sure you can figure out to add a line
>> for the outgoing data also.
>> 
>> Add "ifsum" to the GRAPHS setting in xymonserver.cfg, and the graph
>> should show up on the "trends" page.
>> 
>> 
>> Regards,
>> Henrik
>> 
>> PS: I haven't actually tested any of this, so feel free to provide
>> corrections :-)
>
> Hi !
>
> I knew, this thread is very old,
> but i want this feature very much :)
>
> ..  unfortunately something is missing in my enviroment,
> because i couldn't see the ifsum-graph on the trend-page ... :-(
>
> Can somebody give me an advice how i debug this missing graph ?
>
> My xmon-server is running the 4.3.7-version ..
>
> thanks & cheers,
>
>       Martin


Ok, correction ... I can't see the ifsum-graph
on the default trend-page, but if i take on graph of the trend-page
and change the service=ports to service=ifsum

from
https://xymon.desy.de/xymon-cgi/showgraph.sh?host=oracle1&service=ports&graph_width=576&graph_height=120&first=1&count=2&disp=oracle1&graph_start=1329162535&graph_end=1329335335&action=menu
to
https://xymon.desy.de/xymon-cgi/showgraph.sh?host=oracle1&service=ifsum&graph_width=576&graph_height=120&first=1&count=2&disp=oracle1&graph_start=1329162535&graph_end=1329335335&action=menu

then i got the graph :-)

But how can i display this on the default trend-page ?

thanks
 	martin