[Pharo-project] Monitoring Seaside using ruby god.

May 25, 2012

      I have had some great success monitoring three seaside images serving  an email application.  I thought I would share the script as it offers more features than using daemontools and I have been using ruby god for years now so I am quite comfortable with its stability.

Ruby God:  http://godrb.com

My application admin.ses.sg.estormtech.com/ficonabemail

My god script.
changes directory to the image directory [seaside_root]
monitors http, memory usage and cpu usage and restarts its.
send an email if this happens.  If you want the contact script, just drop me an email.  (the c.notify below).  (You can also find it on github)

Scott

- i receive an email when the image has to be restarted similar to below... 
Message: seaside2 [trigger] process 11692 exited {:exit_code=>6, :pid=>11692, :thread_group_id=>11692, :exit_signal=>17} (ProcessExits)
Host: xxxxxx
Priority: 
Category: 

SEASIDE_GROUPS ={:seaside1=> {},:seaside2=>{}, :seaside3=>{} }
SEASIDE_GROUPS[:seaside1]={:group => "seaside1",:seaside_root =>  "/var/sites/xxxx/", :ports => [8083,8084], :image => "xxx.image"}
SEASIDE_GROUPS[:seaside2]={:group => "seaside2",:seaside_root =>  "/var/sitesyyyy/", :ports => [8088,8089,8090], :image => "yyy.image"}
SEASIDE_GROUPS[:seaside3]={:group => "seaside3",:seaside_root =>  "/var/sites/zzz/", :ports => [8092,8093,8094], :image => "zzz.image"}

SEASIDE_GROUPS.each { |key,grp| 
  puts "starting  #{grp[:group]}  root:  #{grp[:seaside_root]} ports: #{grp[:ports].join(',')} image: #{grp[:image]} }"

  God.watch do |w|
    w.name = "#{grp[:group]}"
    w.group = "seaside"
    w.interval = 30.seconds
    w.dir = grp[:seaside_root]
    w.log = "/var/sites/godlog/#{grp[:group]}.log"
    w.start = "/usr/bin/CogVM -mmap 256m -vm-sound-null -vm-display-null #{grp[:image]}"
#	VM="/usr/bin/CogVM"
#	VM_PARAMS="-mmap 256m -vm-sound-null -vm-display-null"
#	IMAGE="sesbase.image"
#    w.uid = 'www-data' 
#    w.gid = 'www-data'
 w.uid = 'root' 
#    w.gid = 'www-data'

    # retart if memory gets too high
    w.transition(:up, :restart) do |on|
      on.condition(:memory_usage) do |c|
        c.above = 350.megabytes
        c.times = 2
      end
       on.condition(:cpu_usage) do |c|
	        c.interval = 10
	        c.above = 40.percent
	        c.times = 8
	      end
       grp[:ports].each { |port| 
          puts "http checking: #{port} on #{grp[:group]} "
	      on.condition(:http_response_code) do |c|
	        c.host = 'localhost'
	        c.port =  port
	        c.path = '/ficonabemail'
	        c.code_is = 400
	#		c.interval = 30
	        c.timeout = 7.seconds
	        c.times = [3, 5]
	      end
	     }
    end

    # determine the state on startup
    w.transition(:init, { true => :up, false => :start }) do |on|
      on.condition(:process_running) do |c|
        c.running = true
      end
    end

    # determine when process has finished starting
    w.transition([:start, :restart], :up) do |on|
      on.condition(:process_running) do |c|
        c.running = true
        c.interval = 5.seconds
      end

      # failsafe
      on.condition(:tries) do |c|
        c.times = 5
        c.transition = :start
        c.interval = 5.seconds
      end
    end

    # start if process is not running
    w.transition(:up, :start) do |on|
      on.condition(:process_running) do |c|
        c.running = false
      end
	 on.condition(:process_exits) do |c|
	    c.notify = 'scott'
	  end
    end
  end

}

[Pharo-project] Monitoring Seaside using ruby god.

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