Monitor Varnish

August 13th, 2015 Leave a comment Go to comments

Varnish is an amazing reverse proxy product and it does its
job very well, but how can we know that? Or even better
how can we know it detected problems in the backed?

——————NEW POST————————-
08/2015
I have a new set of scripts to monitor varnish servers:
varnish

Here is ZIP file with all plugins I wrote and use for this.
checks_varnish

——————OLD POST————————-

Currently I monitor Varnish server using these and few others not listed:

hit/ratio – official varnish nagios plugin witch is very basic, just returns me the hit/ratio witch is usefull but it does not output perfdata so no graphs for that.

conections – simple bash script that checks how many connections
are established. Simple like that:
result=`netstat -anp | grep :81 | grep -c EST`
echo “Conexoes Totais = $result |Conexoes=$result”
Here is the script

varnish uptime – script that checks if a varnish restarted itself not long time ago. It uses the cmd varnishstat -1 -f uptime usually there are some info about what happend on the /var/log/messages
Here is the code

Errors Backend – this one was a bit more complicated to develop and I find it very usefull, because it checks how many erros it got from the backend (like 503 etc…) I do that every 5 min, the script genertates a tmp file and then each time it runs it zero the tmp and restart loging the “Service Unavailable” erros thrown by “varnishlog -I Unavailable”
Here is the code

Errors Backend 2 – this was a simple way to do the script above by just runnig the varnishstat -1 -f backend_fail
Here is the code

Resposta Backend – It checks how well is the backend answering to requests.┬áThe time it is taking to reply and also creates a graph. For it to work varnish must be using the probe option off the backend, it is based on the command. # varnishadm debug.health |grep Sick
Here is the code

Links – This is a quite amazing script written in Perl by my coworker Nereu and it checks each link in a dynamic way (kind of a spider) verifying each HTTP response code, if any 404 or 500 are detects it returns a error, it also counts how many links there are and graphs how long it takes to go thru all of them.
Download check_url script

This is how my centreon/nagios Varnish  monitor looks like:
varnish


How to install configure and run Varnish

  1. April 11th, 2012 at 04:44 | #1

    the command ” netstat -anp ” is very slow, and it will jam the sys.

    Did you tried “ss -s” command ? it gives TCP connections count (include stab, closed, orphaned, synrecv, time wait)

  2. trish
    October 16th, 2015 at 13:40 | #2

    Hi,

    unfortunately all the http://xoroz.com/* based URLs report a 404. Would you please check?

    Thnx!

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