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Description

Tools for integrating Chef with CloudFormation.

This cookbook contains Ohai plugin that reads cloudformation metadata, LWRP and handler for coordinating with CloudFormation WaitCondition.

Usage

To install the handler and Ohai plugin use the cloudformation::default recipe.

WaitCondition

The easiest way to signal wait condition on chef run completion is the cloudformation::signal recipe. This recipe will activate the handler at the end of the Chef run. You will need to pass the Handler URL using CloudFormation resource metadata:

"SomeAutoscalingGroup": {
  "Type": "AWS::AutoScaling::AutoScalingGroup",
  "Properties": {
    ...
  },
  "Metadata": {
    "waitHandlers": {
      "chef_run_finished": {"Ref": "SomeNodeInstalledWaitHandle"}
    }
  }
},

The signal recipe reads the node['cloudformation']['metadata']['waitHandlers']['chef_run_finished'] attribute and uses it to configure the signal handler.

If you want to singal a wait condition in the middle of the chef run, e.g. after some app was deployed, you can use the cloudformation_signal LWRP:

cloudformation_signal "app deployed" do
    url node['cloudformation']['metadata']['waitHandlers']['app_deployed']
    data "app deployed succefully"
end

For other attributes of the LWRP have a look at the LWRP resource file.