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Chappy
Joined: 22 Aug 2008
Posts: 3
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 Posted: Wed Sep 10, 2008 1:48 pm Post subject: Template Architecture/Design Review |
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After much trial and error I just built my first graph template. It works great, but the process flow is not as refined as I like - or think it should be.
I'm graphing the output from the iostat command using a perl script. The iostat perl script lives on each client. I have a data input method that calls that script via ssh (using shared-key authentication). So this script, and cacti's pub key has to live on each server I wish to graph. This is where I believe there is a better way. I've tried using an snmp extend to map the output of the cacti-iostat.pl script to an OID, and didn't have much luck. It's very possible I screwed up the configuration for grabbing that OID.
I was hoping to have some Cacti gurus take a look and weigh in with thoughts for improvement.
The process flow is:
- Data Input Method Script/Command: ssh root@<hostname> '/usr/local/sbin/cacti-iostat.pl <dev>'
- Data Template
- Graph Template
Script (borrowed from http://www.dreness.com/blog/archives/33):
| Code: | #!/usr/bin/perl -w
# get iostat output
chomp ($iostats = `iostat -x -d -k 1 5 | tail -n 2 | grep $ARGV[0] | awk '{print \$1 " " \$2 " " \$3 " " \$4 " " \$5 " " \$6 " " \$7 " " \$8 " " \$9 " " \$10 " " \$11 " " \$12}'`);
@iostats = split(/\s/, $iostats);
$Device = $iostats[0];
$rrqm = $iostats[1];
$wrqm = $iostats[2];
$reads = $iostats[3];
$writes = $iostats[4];
$rsec = $iostats[5];
$wsec = $iostats[6];
$avgrqsz = $iostats[7];
$avgqusz = $iostats[8];
$await = $iostats[9];
$svctm = $iostats[10];
$util = $iostats[11];
print "device\:$Device rrqm\:$rrqm wrqm\:$wrqm reads\:$reads writes\:$writes rkb\:$rsec wkb\:$wsec avgrqsz\:$avgrqsz avgqusz\:$avgqusz await\:$await svctm\:$svctm util\:$util"; |
Output:
| Code: | # perl cacti-iostat.pl sda
device:sda rrqm:0.00 wrqm:22.77 reads:0.00 writes:1.98 rkb:0.00 wkb:99.01 avgrqsz:100.00 avgqusz:0.01 await:3.00 svctm:3.00 util:0.59 |
As you can see from the image attachments, the Data Input Method is parsing the cacti-iostat.pl output and storing that in an RRD file. The Graph Template is Data Source as it's Item Inputs.
Anyone have any thoughts for improvement?
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1090 Time(s) |
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1090 Time(s) |
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1090 Time(s) |
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1090 Time(s) |
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| iostat Average Request Size |
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1090 Time(s) |
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gandalf
Developer
Joined: 02 Dec 2004
Posts: 12295
Location: Muenster, Germany
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| Posted: Thu Sep 11, 2008 12:12 pm Post subject: |
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Please find help and a similar step-by-step procedure at the first link of my sig. It still seems to not be that popular as I though it should
Reinhard
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Chappy
Joined: 22 Aug 2008
Posts: 3
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| Posted: Thu Sep 11, 2008 2:30 pm Post subject: |
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Edit:
Hmm, now I see your signature. Never mind then, I'll take a look!
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Hi Reinhard,
I'm not seeing your sig and I can not find anything relevant in your profile either.
Are you referring to the Cacti Manual (http://docs.cacti.net/?q=node/438)?
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gandalf
Developer
Joined: 02 Dec 2004
Posts: 12295
Location: Muenster, Germany
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| Posted: Fri Sep 12, 2008 2:13 pm Post subject: |
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Not to the manual, but the HowTo. You will see my sig when logging into the forum
Reinhard
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