Μήνας: Απρίλιος 2009

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Send mon alerts to twitter

Just a quick proof of concept hack..

I modified twitter-cmdline script to fit mon‘s alert specs..

Download twitter-cmdline-1.03 and place it in /usr/lib/mon/alert.d (or appropriate path of your mon installation).

Then grab twitter.alert and put it there too.

Run twitter.pl and give your twitter credentials (stored in ~/.twitterrc the first time it runs). It’s probably a good idea to create an extra twitter account for this.

Now use twitter.alert in your mon config to send alerts in twitter, where people can follow them!

watch system01
    service disk_root
        interval 5m
        monitor munin.monitor -M df -F _dev_cciss_c0d0p1 -w 90 -c 95 -H
        depend SELF:ping
        period _ANYTIME_
            alertevery 15m summary
            comp_alerts
            alertafter 3
            alert twitter.alert
            upalert twitter.alert
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Teleworking

Quoting from «The Pond»  by Rands

Working remotely isn’t a privilege; it’s work. And it’s the same work we’re all doing back at the mothership… fully clothed… in the Pond.

…and if you are a teleworker or manage teleworkers, you should read the comments too!

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Integrating Munin with Mon

Munin already integrates with Nagios .. But I didn’t find anything for mon ..

So I hacked check_munin.pl from Nagios Exchange to work with mon ..

Download munin.monitor and place it in mon.d/ of your mon installation.

Now you can monitor ANY munin value using mon.

Use something like the following in your systems_monitor.m4

watch system01
    service disk_root
        interval 5m
        monitor munin.monitor -M df -F _dev_cciss_c0d0p1 -w 90 -c 95 -H
        depend SELF:ping
        period _ANYTIME_
            alertevery 15m summary
            comp_alerts
            alertafter 3
            alert mail.alert _MY_EMAIL_
            upalert mail.alert _MY_EMAIL_
    service toomanyqueuedmails
        interval 5m
        monitor munin.monitor -M sendmail_mailqueue -F mails -w 50 -c 100 -H
        depend SELF:ping
        period _ANYTIME_
            alertevery 15m summary
            comp_alerts
            alertafter 3
            alert mail.alert _MY_EMAIL_
            upalert mail.alert _MY_EMAIL_
    service dnsresponse
        interval 5m
        monitor munin.monitor -M dnsresponse_193.92.110.1 -F avg -w 20 -c 50 -H
        depend SELF:ping
        period _ANYTIME_
            alertevery 15m summary
            comp_alerts
            alertafter 3
            alert mail.alert _MY_EMAIL_
            upalert mail.alert _MY_EMAIL_

Make sure that your MON server’s IP is allowed in munin-node.conf of your munin client.

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munin plugin to monitor dns response times

A munin plugin that allows you to monitor the response time of any DNS that allows you to recurse.

dnsresponse_ — it’s a poor man’s smokeping DNS probe :)
(wordpress.com does not allow arbitrary file uploads, so grab it from munin-exhange)

To install it, place it in /usr/share/munin/plugins/ and run «munin-node-configure –shell«.

By default it graphs the Average, Median and StdDev of 20 DNS queries.

sample dnsresponse_ graph
sample dnsresponse_ graph
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11ο AutoExec.Gr Community Event στη Θεσσαλονίκη

Το autoexec.gr,  η γνωστή  Ελληνική κοινότητα των IT Pros, οργανώνει συνάντηση στη Θεσσαλονίκη στις 28/04/2009 (στη Μονή Λαζαριστών)..

Φυσικά θα υπάρχουν ενδιαφέρουσες παρουσιάσεις όπως κάθε φορά, και ακόμα πιο ενδιαφέροντα «πηγαδάκια» :)

Οσοι πιστοί προσέλθετε.. http://autoexec.gr/forums/thread/14700.aspx

(Invitation-from:)

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20 of the Best Free Linux Books

LiNUXLiNKS.com has posted a list of their favorite free Linux books.

«Individuals wanting to learn about the Linux operating system have a large selection of books to choose from. There are many thousands of informative Linux books which are in-print and available to download or buy at reasonable cost. However, as many users are attracted to Linux for the very reason that it is available under a freely distributable license, some will also want this to extend to the documentation they read. The focus of this article is to select some of the finest Linux books which are available to download for free.«

(via)