[mrtg] Graphing Uptime

Daniel Beardsmore daniel at trustnetworks.co.uk
Tue Oct 2 16:25:26 CEST 2018


It seems that a script is needed to get interface uptime (it needs a number of steps — there's no OID that gives you that figure), and getting custom scripts working was pretty straightforward.

I notice that you’re meant to give the hostname and uptime in the script, but yours didn't, and now neither does mine, but MRTG doesn't care, and before I realised that the scripts were meant to, I went with RouterUptime instead.

>

Daniel Beardsmore
Trust Networks Ltd

Tel:    01727 867961


http://www.trustnetworks.co.uk/

This communication is private and confidential and may be legally privileged and it is intended for the above-named person/s or entity only.  Any opinions expressed in this communication are not necessarily those of the company.  If this communication has come to you in error you must take no action based on it, nor must you copy or show it to anyone - please delete/destroy and inform the sender immediately.  Internet communications cannot be guaranteed to be secure or error free.  Any attachment(s)  are believed to be free from viruses, but it is the responsibility of the recipient to make all the necessary virus checks. Trust Networks Ltd may monitor all incoming and outgoing e-mails in line with current legislation.


-----Original Message-----
> From: mrtg [mailto:mrtg-bounces+daniel=trustnetworks.co.uk at lists.oetiker.ch]
> On Behalf Of Volk,Gregory B
> Sent: 28 September 2018 21:37
> To: mrtg <mrtg at lists.oetiker.ch>
> Subject: Re: [mrtg] Graphing Uptime
>
> >>
> >>uptime=`snmpwalk -v1 -c public 10.0.0.1 SysUptime | awk -F'[()]'
> >>'{print $2}'` let hours=uptime let hours=$hours/100/60/60 echo $hours
> >>
> >>If you run that bash and pass it into MRTG, with directives to create
> >>a gauge type graph, you should get a fairly nifty uptime graph. With
> >>correct units for time as a bonus.
>
>
> Similar to the above script, this is what I use for plotting uptime with
> MRTG.
> If your snmpget binary supports the "-Otv" formatting flags it should work.
>
>
> #!/bin/bash
> #
> # uptime.sh
> # make a call to snmpget with -Otv formatting to just uptime in # timeticks
> only, not with x days hours etc.
> #
> # ./uptime.sh <read_community> <devicename_or_ip> # ./uptime.sh public
> myrouter1 #
> COMMUNITY=$1
> HOST=$2
> UPTIMETICKS=$(/usr/bin/snmpget -v2c -Otv -c $COMMUNITY $HOST
> .1.3.6.1.2.1.1.3.0) #UPTIMEDAYS=$(expr $UPTIMETICKS / 8640000) echo
> $UPTIMETICKS echo $UPTIMETICKS echo $UPTIMETICKS echo $UPTIMETICKS # end
> uptime.sh
>
>
>
> And the MRTG target config that calls uptime.sh looks like this:
>
> ShortLegend[myrouter_uptime]: days
> YLegend[myrouter_uptime]: days
> LegendI[myrouter_uptime]: days
> LegendO[myrouter_uptime]: days
> Directory[myrouter_uptime]: myrouter
> WithPeak[myrouter_uptime]: ywm
> MaxBytes[myrouter_uptime]: 100000
> Options[myrouter_uptime]: growright, gauge, nopercent
> Title[myrouter_uptime]: myrouter Uptime in Days
> Target[myrouter_uptime]: `/opt/mrtg/bin/scripts/uptime.sh public myrouter` /
> 8640000
> PageTop[myrouter_uptime]: <H1>myrouter Uptime in Days</H1>
>   <TABLE>
>     <TR><TD>ifType:</TD><TD>gauge</TD></TR>
>     <TR><TD>Resource:</TD><TD><br>
>     uptime.sh
>     </TD></TR><br>
>   </TABLE>
>
>
>
>
>
>
>
> If you are not the intended recipient of this message (including attachments)
> or if you have received this message in error, immediately notify us and
> delete it and any attachments.
>
> If you do not wish to receive any email messages from Edward Jones, excluding
> administrative communications, please email this request to Opt-
> Out at edwardjones.com from the email address you wish to unsubscribe.
>
> For important additional information related to this email, visit
> http://www.edwardjones.com/disclosures/email.html. Edward D. Jones & Co.,
> L.P. d/b/a Edward Jones, 12555 Manchester Road, St. Louis, MO 63131 © Edward
> Jones. All rights reserved.
>
>
> -----Original Message-----
> From: mrtg [mailto:mrtg-bounces+greg.volk=edwardjones.com at lists.oetiker.ch]
> On Behalf Of Edwin A. Epstein III
> Sent: Friday, September 28, 2018 3:21 PM
> To: mrtg
> Subject: Re: [mrtg] Graphing Uptime
>
> CAUTION: This email originated from outside of the organization. Do not click
> links or open attachments unless you recognize the sender and know the
> content is safe.
>
>
> Hi Daniel,
>
> Yes that example was horribly bodged. I haven't inspected the code, but I
> suspect MRTG works with the value returned by SNMP. For example, I receive
> this:
>
> SNMPv2-MIB::sysUpTime.0 = Timeticks: (105630500) 12 days, 5:25:05.00
>
> That cannot be graphed because it is not a number. Everything that MRTG
> graphs must be turned into some number. The example is also horribly bodged
> because it's trying to use a bandwidth graph instead of a gauge. MRTG
> provides for graphing values like CPU load, Memory, and Free disk space. You
> really want to grab the most recent book as it will tell you how to construct
> these. I'll give you an example:
>
> Target[the_graph]:
> 1.3.6.1.4.1.32050.2.1.27.5.1&1.3.6.1.4.1.32050.2.1.27.5.1:snmp_community_name
> @10.0.0.1:::::2 * -1.1034882
> Options[the_graph]:       unknaszero,gauge,growright,nopercent,expscale,noo
> SetEnv[the_graph]:        MRTG_INT_IP="No Ip" MRTG_INT_DESCR="n/a"
> Colours[the_graph]:       ORANGE#dd8811,NONE#000000,VIOLET#0000ff,DARK
> GREEN#006600
> Title[the_graph]:         Voltage Monitor
> MaxBytes[the_graph]:      850
> AbsMax[the_graph]:        850
> XSize[the_graph]:         600
>
> All of these directives are explained in the book. The two most important
> ones are the Target and Options directives. The gauge option is what makes it
> a gauge graph, and the noo option suppresses one side of the graph (input or
> output). With the directives you can construct your own custom graph with
> correct units for uptime, and a scale that will make sense. You can control
> titles, legend values, etc.
>
> Your first issue is how to convert 'Timeticks: (105630500) 12 days,
> 5:25:05.00' to a number. I would suggest graphing the hours of uptime. Even
> after a few years of uptime, the value itself will be less than 100,000 and
> probably graph well over time.
>
> MRTG provides for pre-processing of SNMP values before they are passed to
> MRTG. I'm performing math before I use the voltage value. Since I'm pretty
> sure that the math is any valid perl statement, you might be able to get away
> with Perl. That being said, you may be best served by simply creating your
> own data collection plug-in, which is thankfully easier done than said.
> Straight from the book:
>
> Target[ezwf]: `/usr/local/bin/mrtg-scripts -a 1`
>
> All you need to is create a bash script that pipes your snmpwalk output into
> a awk, and then convert the returned value into the number of hours.
> Timeticks can be converted to hours: Hours = Timeticks / 100 / 60 / 60.
>
> Something like:
>
> uptime=`snmpwalk -v1 -c public 10.0.0.1 SysUptime | awk -F'[()]' '{print
> $2}'` let hours=uptime let hours=$hours/100/60/60 echo $hours
>
> If you run that bash and pass it into MRTG, with directives to create a gauge
> type graph, you should get a fairly nifty uptime graph. With correct units
> for time as a bonus.
>
>
>
> Sincerely,
>
> Edwin A Epstein, III
> Rhinobee Internet Services
> 707.237.7504 ext 209
> 707.737.0288 Mobile
>
> ----- Original Message -----
> From: "mrtg-request" <mrtg-request at lists.oetiker.ch>
> To: "mrtg" <mrtg at lists.oetiker.ch>
> Sent: Friday, September 28, 2018 3:00:02 AM
> Subject: mrtg Digest, Vol 132, Issue 1
>
> Send mrtg mailing list submissions to
>         mrtg at lists.oetiker.ch
>
> To subscribe or unsubscribe via the World Wide Web, visit
>         https://lists.oetiker.ch/cgi-bin/listinfo/mrtg
> or, via email, send a message with subject or body 'help' to
>         mrtg-request at lists.oetiker.ch
>
> You can reach the person managing the list at
>         mrtg-owner at lists.oetiker.ch
>
> When replying, please edit your Subject line so it is more specific than "Re:
> Contents of mrtg digest..."
>
>
> Today's Topics:
>
>    1. Graphing uptime (Daniel Beardsmore)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 28 Sep 2018 10:06:23 +0100
> From: "Daniel Beardsmore" <resident at telcontar.net>
> To: <mrtg at lists.oetiker.ch>
> Subject: [mrtg] Graphing uptime
> Message-ID: <041801d4570a$88f67650$9ae362f0$@telcontar.net>
> Content-Type: text/plain; charset="us-ascii"
>
> Hello
>
>
>
> I can see that graphing uptime is possible, as you can see here:
>
>
>
> http://www.hotelsvillegia.com/mrtg/uptime.html
>
>
>
> The HTML pages report uptime in the format: "163 days, 21:07:10"
>
>
>
> If I check manually, I get this:
>
>
>
> snmpget -v2c -c somecommunity somehost 1.3.6.1.2.1.1.3.0
>
> DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (1415941565) 163 days,
> 21:10:15.65
>
>
>
> The format is almost the same, but the latter contains the full centisecond
> accuracy. You do nonetheless get the raw number included.
>
>
>
> Now, using this in MRTG yields:
>
>
>
> 2018-09-27 19:56:04 -- 2018-09-27 19:51:33: WARNING: Expected a number but
> got '163 days, 7:17:10'
>
>
>
> Looking at the source code, I cannot determine quite how uptime is processed.
> It seems odd that the format is almost the same (without the centiseconds),
> which suggests (along with other code) that MRTG receives pre-formatted
> output, and then has to scrape out the useful bits. (Which is just plain
> horrible if this is true.)
>
>
>
> Am I right in thinking that MRTG presently has no way to extract the raw
> figure here? It seems that the SNMP library is formatting the data
> prematurely and MRTG just works with that preformatted value as it suits its
> own purposes, but that you cannot get the raw data out if you choose, for
> example if you want to record uptime as a graph for checking for reboots.
>
>
>
> In the example posted, I suspect that was bodged to get that to work.
>
>
>
> Regards
>
>
>
> Daniel.
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> <http://lists.oetiker.ch/pipermail/mrtg/attachments/20180928/8eacb971/attachm
> ent-0001.html>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> mrtg mailing list
> mrtg at lists.oetiker.ch
> https://lists.oetiker.ch/cgi-bin/listinfo/mrtg
>
>
> ------------------------------
>
> End of mrtg Digest, Vol 132, Issue 1
> ************************************
> (null)
>
> _______________________________________________
> mrtg mailing list
> mrtg at lists.oetiker.ch
> https://lists.oetiker.ch/cgi-bin/listinfo/mrtg
> _______________________________________________
> mrtg mailing list
> mrtg at lists.oetiker.ch
> https://lists.oetiker.ch/cgi-bin/listinfo/mrtg


More information about the mrtg mailing list