[Seaside] Monit on Ubuntu / Debian to monitor Seaside images

[Sebastian Sastre]

Hi Rajeev,
 
    Monit its simple and yet powerful.
 
    This is how the monitrc file looks like to monitor a squeak image:
 
############################################################################
###
## Monitoring DEVELOPMENT Service OJ7WRE
############################################################################
###
 
 check process OJ7WRE with pidfile /var/run/services/OJ7WRE.pid
 group server
 start program = "/etc/init.d/OJ7WRE start"
 stop program = "/etc/init.d/OJ7WRE stop"
 
 if cpu > 60% for 2 cycles then alert
 if cpu > 80% for 5 cycles then restart
 if totalmem > 200.0 MB for 2 cycles then restart
 
 if loadavg(5min) greater than 10 for 8 cycles then restart
 if 5 restarts within 5 cycles then timeout
############################################################################
###
 
    the start and stop script is doing more or less what you are doing
manually. I send a kill -15 to close image gently. Also I needed to make the
pid file when the image starts and remove before image quits. I have an
object in the image dedicated to startup and shutdown production stuff
inside the image.
 
    For a "more monitored" services you can make monit to send you an email
to your cell phone if it reach some point (like a service restart or fail to
start or CPU 100% for more than 5 min or apache is down or whatever).
 
    cheers,
 
Sebastian Sastre



  _____  

De: seaside-bounces at lists.squeakfoundation.org
[mailto:seaside-bounces at lists.squeakfoundation.org] En nombre de Rajeev
Lochan
Enviado el: Miércoles, 06 de Febrero de 2008 17:36
Para: Seaside - general discussion
Asunto: [Seaside] Monit on Ubuntu / Debian to monitor Seaside images


Hi,
I have been working towards setting up a dedicated server (Ubuntu) to host
my Seaside app as per Ramon's Blog
http://onsmalltalk.com/programming/smalltalk/scaling-seaside-redux-enter-the
-penguin/

Till now, I have been successful in having Apache serve static content and
Load balance between 3 images of my Seaside App. Sticky sessions are working
and everything is going well so far. But I had a problem when installing
Daemontools (which Ramon has written in his blog and also Lukas has written
in Mailing lists), the recent versions of Ubuntu, dont support Daemontools
out of the box. 

In one of the comments to Ramon's post, I could learn that some of the
seasiders have used Monit to do much more than want Daemontools does. Could
you please guide me how to go about.

I came across a blog on Rails using Monit
http://www.igvita.com/2006/11/07/monit-makes-mongrel-play-nice/
In that, what is the equivalent code to Seaside of the following code ?


start program = "/usr/local/bin/ruby /usr/local/bin/mongrel_rails start -d
-e production -p 8010 -a 127.0.0.1 -P
/home/user/current/log/mongrel.8010.pid -c /home/user/rails/current"


    stop program  = "/usr/local/bin/ruby /usr/local/bin/mongrel_rails stop
-P /home/user/current/log/mongrel.8010.pid"
Till now, I have been starting the images manually by 
/seaside$ squeakvm  -nodisplay seasidedemo "" port 9090 &

and to kill it, i use $ pkill squeakvm    or $ kill [PID of SqueakVM]

I suppose, we will also have to change the following code

if totalmem is greater than 60.0 MB for 5 cycles then restart




When an image is running on my server (Pentium Dual Core 2.8 GHz with 1 GB
RAM), it shows almost 3-4% CPU and 3-4% RAM , should we shift the memory cap
from 60 MB to 100 MB / image ?


Is there any other options we have ? 

Thanks for the help,
 
Rajeev 

Co-founder, AR-CAD.com

http://www.ar-cad.com
+91 9243468076 (Bangalore)
080 65355873 

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