Demystifying Azure Policies with ARM Templates

In my blog post Defining Input Parameters For Policy Definitions in ARM Template I’ve showed you how to use deploy policy definitions with parameters via ARM template. I didn’t described completely on why such workaround is needed but I think now it is good time to explain that as well. The topic is a little bit complex so I hope my explanation will help you understand it.

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Platform Image Azure Policy Definition Example

Azure Policy team has a GitHub repository of Policy definitions examples. Recently I’ve been looking at some of the examples there and I’ve noticed that one of them was not working correctly. Specifically I am referring to Platform Image Policy. Additionally the example contains only the rules. It does not have ARM template for deploying the definition. You will notice also that the policy is pretty static as it does not contain parameters. Because of that based on that sample I would like to create an example on my own and show it to you.

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Defining Input Parameters For Policy Definitions in ARM Template

My good friend and fellow MVP Tao Yang wrote a great post on Using ARM Templates to Deploying Azure Policy Definitions That Requires Input Parameters. Azure Policy has two terms that you should be aware:

  • Policy Definition – This is the policy itself. This is the definition of what will be governed. The policy definition when created does not do anything until it is assigned. There are policy definitions available out of the box (created by Microsoft) and such that can be created on your own. Out of box policies are of type built-in and the ones created by you are custom.
  • Policy Assignment – This assigns policy definition to be applied at specific level like subscription, management group or resource group.

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What is OMS and a Brief History of It

While discussing Azure/OMS topics in the community I often see incorrect usage of OMS (Operations Management Suite). That is understandable of course as Microsoft hasn’t done good job at clearing out all the terms but I still think we should be using the correct term when posting questions or discussing OMS in forums and other sites. This can help us communicate better between each other and especially in forums could result to answering question faster. As we the move from OMS Portal to Azure Portal it was about time to write this blog post which I’ve intended to do for quite some time but always delayed due to different circumstances.

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