Align Ganglia client behavior to current Chef 11.4 version.

opsworks_ganglia/recipes/configure-client.rb

@@ -1,26 +1,32 @@
-if node[:opsworks][:layers]['monitoring-master']
+if node[:opsworks][:layers].has_key?('monitoring-master')
   include_recipe 'opsworks_ganglia::client'
 
+  monitoring_master = node[:opsworks][:layers]['monitoring-master'][:instances].collect{ |instance, names|
+    names['private_ip']
+  }.first rescue nil
+
   service 'gmond' do
-    case node[:platform]
-    when 'ubuntu'
-      start_command '/etc/init.d/ganglia-monitor start'
+    case node[:platform_family]
+    when 'debian'
+      if monitoring_master.nil?
+        start_command 'echo "No action"'
+      else
+        start_command '/etc/init.d/ganglia-monitor start'
+      end
       stop_command '/etc/init.d/ganglia-monitor stop'
-      restart_command '/etc/init.d/ganglia-monitor restart'
-    when 'centos','redhat','fedora','amazon'
-      start_command '/etc/init.d/gmond start'
+    when 'rhel'
+      if monitoring_master.nil?
+        start_command 'echo "No action"'
+      else
+        start_command '/etc/init.d/gmond start'
+      end
       stop_command '/etc/init.d/gmond stop'
-      restart_command '/etc/init.d/gmond restart'
     end
 
     supports :status => false, :restart => false
     action :nothing
   end
 
-  monitoring_master = node[:opsworks][:layers]['monitoring-master'][:instances].collect{ |instance, names|
-    names['private_ip']
-  }.first rescue nil
-
   template '/etc/ganglia/gmond.conf' do
     source 'gmond.conf.erb'
     variables({