[ILUG] Web Monitoring.

[John P . Looney]

On Tue, Feb 20, 2001 at 02:03:32PM +0000, Noel Harnett mentioned:
> I need to set up a script file to monitor a specific web address, and if
> the URL is down send out a pager or a text message. I know there are
> services out there for this, but hopefully it's something that can be
> done in house, so to speak.

 I was just playing with "mon"[0] yesterday. Basically, you set it up so
that it calls a script every few minutes, and if there is a problem, do
something. For instance:

 Making a /etc/mon/mon.cf file with:

hostgroup cluster goodwillow evilwillow

watch goodwillow
    service ping
        interval 2m
        monitor fping.monitor
        period wd {Mon-Sun} hr {7am-10pm}
            alert mail.alert john at antefacto.com
            alertevery 1h
            alert mail.alert -S "Mysql is down!" john at antefacto.com
            upalert mail.alert -S "Mysql is back!" john at antefacto.com
    service mysql
        interval 2m
        monitor msql-mysql.monitor --mode mysql --username=test --password=test --database=test
        randskew 1s
        depend SELF:ping
        randskew 1s
        period wd {mon-sun}
            alert mail.alert john at antefacto.com
            alertevery 1h
            alert mail.alert -S "Mysql is down!" john at antefacto.com
            upalert mail.alert -S "Mysql is back!" john at antefacto.com

watch goodwillow
    service ping
        interval 2m
        monitor fping.monitor
        period wd {Mon-Sun} hr {7am-10pm}
            alert mail.alert john at antefacto.com
            alertevery 1h
            alert mail.alert -S "Mysql is down!" john at antefacto.com
            upalert mail.alert -S "Mysql is back!" john at antefacto.com
    service mysql
        interval 2m
        monitor msql-mysql.monitor --mode mysql --username=test --password=test --database=test
        randskew 1s
        depend SELF:ping
        randskew 1s
        period wd {mon-sun}
            alert mail.alert john at antefacto.com
            alertevery 1h
            alert mail.alert -S "Mysql is down!" john at antefacto.com
            upalert mail.alert -S "Mysql is back!" john at antefacto.com

 Will test the mysql server, as well as a standard "ping" on the machines
every 2 minutes, and if the mysql server is down, it'll email me, and if
the machine isn't pingable either, it'll no that mysql depends on "ping"
working, so won't send me two messages every time. Kinda cool. It has
loads of "alert" scripts for everything from http checking to free disk
space on NetApps, or you could write your own.

Kate

[0] http://www.kernel.org/software/mon/

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 When I say 'free', I mean 'free': free from bond, of chain or command: 
to go where you will, even to Mordor, Saruman, if you desire. " 
    -- Gandalf, paraphrasing the choice between Free and Non-free software