digitalhobbit · February 21, 2009 01:04 · Feb 27, 2009 · Feb 21, 2009
diff --git a/gistfile1.rb b/gistfile1.rb
@@ -6,7 +6,7 @@
 
 # Based on example from <http://railscasts.com/episodes/130-monitoring-with-god>
 
-RAILS_ROOT = File.dirname(File.dirname(__FILE__))
+RAILS_ROOT = '/var/www/myapp'
 
 def generic_monitoring(w, options = {})
   w.start_if do |start|
@@ -42,15 +42,11 @@ def generic_monitoring(w, options = {})
 end
 
 # Start 3 workling daemons
-# TODO: Verify that this really works. Starting should be fine, but dealing with
-#       individual dead workling daemons might be tricky, as there's only a single
-#       command to start one or stop all worklings. Might have to use kill + cat
-#       to kill a specific workling process, similar to the starling config below.
 0.upto(2) do |num|
   God.watch do |w|
-    script = "RAILS_ENV=#{RAILS_ENV} #{RAILS_ROOT}/script/workling_client"
+    script = "RAILS_ENV=#{RAILS_ENV} #{RAILS_ROOT}/script/workling_client --number #{num}"
     w.name = "myapp-workling-#{num}"
-    w.group = "myapp"
+    w.group = "myapp-worklings"
     w.interval = 60.seconds
     w.start = "#{script} start"
     w.restart = "#{script} restart"
@@ -67,7 +63,7 @@ def generic_monitoring(w, options = {})
 
 God.watch do |w|
   w.name = "myapp-starling"
-  w.group = "myapp"
+  w.group = "myapp-starlings"
   w.interval = 60.seconds
   w.start = "/usr/bin/starling -d -P #{RAILS_ROOT}/log/starling.pid -q #{RAILS_ROOT}/log/ -p #{STARLING_PORT} -h #{STARLING_HOST}"
   w.stop = "kill `cat #{RAILS_ROOT}/log/starling.pid`"

diff --git a/gistfile1.rb b/gistfile1.rb
@@ -0,0 +1,81 @@
+# If we ever end up running God / Starling on other environments than production.
+# we'll have to find a different way to set the values below.
+STARLING_PORT = 15151
+STARLING_HOST = '<my ip address>'
+RAILS_ENV = 'production'
+
+# Based on example from <http://railscasts.com/episodes/130-monitoring-with-god>
+
+RAILS_ROOT = File.dirname(File.dirname(__FILE__))
+
+def generic_monitoring(w, options = {})
+  w.start_if do |start|
+    start.condition(:process_running) do |c|
+      c.interval = 10.seconds
+      c.running = false
+    end
+  end
+
+  w.restart_if do |restart|
+    restart.condition(:memory_usage) do |c|
+      c.above = options[:memory_limit]
+      c.times = [3, 5] # 3 out of 5 intervals
+    end
+
+    restart.condition(:cpu_usage) do |c|
+      c.above = options[:cpu_limit]
+      c.times = 5
+    end
+  end
+
+  w.lifecycle do |on|
+    on.condition(:flapping) do |c|
+      c.to_state = [:start, :restart]
+      c.times = 5
+      c.within = 5.minute
+      c.transition = :unmonitored
+      c.retry_in = 10.minutes
+      c.retry_times = 5
+      c.retry_within = 2.hours
+    end
+  end
+end
+
+# Start 3 workling daemons
+# TODO: Verify that this really works. Starting should be fine, but dealing with
+#       individual dead workling daemons might be tricky, as there's only a single
+#       command to start one or stop all worklings. Might have to use kill + cat
+#       to kill a specific workling process, similar to the starling config below.
+0.upto(2) do |num|
+  God.watch do |w|
+    script = "RAILS_ENV=#{RAILS_ENV} #{RAILS_ROOT}/script/workling_client"
+    w.name = "myapp-workling-#{num}"
+    w.group = "myapp"
+    w.interval = 60.seconds
+    w.start = "#{script} start"
+    w.restart = "#{script} restart"
+    w.stop = "#{script} stop"
+    w.start_grace = 20.seconds
+    w.restart_grace = 20.seconds
+    w.pid_file = "#{RAILS_ROOT}/log/workling#{num}.pid"
+
+    w.behavior(:clean_pid_file)
+
+    generic_monitoring(w, :cpu_limit => 25.percent, :memory_limit => 100.megabytes)
+  end
+end
+
+God.watch do |w|
+  w.name = "myapp-starling"
+  w.group = "myapp"
+  w.interval = 60.seconds
+  w.start = "/usr/bin/starling -d -P #{RAILS_ROOT}/log/starling.pid -q #{RAILS_ROOT}/log/ -p #{STARLING_PORT} -h #{STARLING_HOST}"
+  w.stop = "kill `cat #{RAILS_ROOT}/log/starling.pid`"
+  w.start_grace = 10.seconds
+  w.restart_grace = 10.seconds
+  w.pid_file = "#{RAILS_ROOT}/log/starling.pid"
+
+  w.behavior(:clean_pid_file)
+
+  generic_monitoring(w, :cpu_limit => 30.percent, :memory_limit => 30.megabytes)
+end