What is a Policy Definition?
A policy definition is a template that defines the rules to enforce compliance and manage resources in your Azure environment. It essentially describes the desired state of your resources.
Policy definitions are used to create and manage policy sets, which are collections of policy definitions. Policy sets are then applied to scopes (subscriptions, management groups, or individual resource groups) to enforce compliance.
Example: Enforce a Virtual Machine Size Restriction
You can create a policy definition that restricts the sizes of virtual machines in your subscription. This ensures that VMs are deployed with appropriate resource allocations, preventing overspending or performance issues.
Here's a simplified example:
- Rule Type: Restriction
- Name: Virtual Machine Size Restriction
- AssignableScopes: Subscription
- Description: This policy restricts the allowed sizes of virtual machines.
- Parameters:
- AllowedSizes: A comma-separated list of allowed VM sizes (e.g., Standard_D2s_v3, Standard_E4s_v3)