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By Austin Melton, Bernd S. W. Schröder, George E. Strecker

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To fix the circular dependency problem, all you need to do is remove one of the dependency lines and thus break the circle. There's more… Resource and relationship graphs can be useful even when you don't have a bug to find. If you have a very complex network of classes and resources, studying the resources graph can help you see where to simplify things. Similarly, when dependencies become too complicated to understand from reading the manifest, the graphs can be a much more useful form of documentation.

How it works… When this resource is compiled Puppet will print out the message: notice: Got this far! There's more… If you're the kind of brave soul who likes experimenting, and I hope you are, you'll probably find yourself using debug messages a lot to figure out why your code doesn't work. So knowing how to get the most out of Puppet's debugging features can be a great help. Some of these uses are explained in the following text. Printing out variable values You can reference variables in the message: notify { "operatingsystem is $operatingsystem": } Puppet will interpolate the values in the printout: notice: operatingsystem is Ubuntu Printing the full resource path For more advanced debugging, you may want to use the parameter withpath to see in which class the notify message was executed: notify { "operatingsystem is $operatingsystem": withpath => true, } 50 Chapter 2 Now the notify message will be prefixed with the complete resource path as shown in the following code snippet: notice: /Stage[main]/Nagios::Target/Notify[operatingsystem is Ubuntu]/ message: operatingsystem is Ubuntu Logging messages on the Puppetmaster Sometimes you just want to log a message on the Puppetmaster, without generating extra output on the client.

For example, if you are running a web application, it's not enough to know that the web server is listening to connections on port 80 and responding with an HTTP 200 OK status. It could just be returning the default Apache welcome page. If your web application is an online store, for example, you might want to check the following: ff Do we see expected text in the returned page (for example, "Welcome to FooStore")? ff Can we log in as a user (if the application supports sessions)? ff Can we search for a product and see the expected result?

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