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+---
+layout: default
+title: Using With Chef
+toc: false
+---
+[FactsOpsCodeOhai]: http://projects.puppetlabs.com/projects/mcollective-plugins/wiki/FactsOhai
+
+If you're a Chef user you are supported in both facts and classes filters.
+
+## Facts
+There is a [community plugin to enable Ohai][FactsOpsCodeOhai] as a fact source.
+
+Using this plugin Ohai facts will be converted from:
+
+{% highlight javascript %}
+  "languages": {
+    "java": {
+      "runtime": {
+        "name": "OpenJDK  Runtime Environment",
+        "build": "1.6.0-b09"
+      },
+      "version": "1.6.0"
+    },
+{% endhighlight %}
+
+to:
+
+{% highlight ruby %}
+ "languages.java.version"=>"1.6.0",
+ "languages.java.runtime.name"=>"OpenJDK  Runtime Environment",
+ "languages.java.runtime.build"=>"1.6.0-b09",
+{% endhighlight %}
+
+So you can use the flattened versions of the information provided by Ohai in filters, reports etc.
+
+{% highlight console %}
+% mco find --with-fact languages.java.version=1.6.0
+{% endhighlight %}
+
+## Class Filters
+Chef does not provide a list of roles and recipes that has been applied to a node, to use with MCollective you need to create such a list.
+
+It's very easy with Chef to do this in a simple cookbook.  Put the following code in a cookbook and arrange for it to run *last* on your node.
+
+This will create a list of all roles and recipes in _/var/tmp/chefnode.txt_ on each node for us to use:
+
+{% highlight ruby %}
+ruby_block "store node data locally" do
+  block do
+    state = File.open("/var/tmp/chefnode.txt", "w")
+
+    node.run_state[:seen_recipes].keys.each do |recipe|
+        state.puts("recipe.#{recipe}")
+    end
+
+    node.run_list.roles.each do |role|
+        state.puts("role.#{role}")
+    end
+
+    state.close
+  end
+end
+{% endhighlight %}
+
+You should configure MCollective to use this file by putting the following in your _server.cfg_
+
+{% highlight ini %}
+classesfile = /var/tmp/chefnode.txt
+{% endhighlight %}
+
+You can now use your roles and recipe lists in filters:
+
+{% highlight console %}
+% mco find --with-class role.webserver --with-class /apache/
+{% endhighlight %}