![]() ![]() Validation conditions or output postconditions can ensure your configuration's inputs and outputs meet specific requirements.Additionally, check blocks do not prevent or block the overall execution of Terraform operations. Check blocks with assertions validate your infrastructure as a whole. ![]() Use the following broad guidelines to select the best custom condition for your use case: Terraform's different custom conditions are best suited to various situations. Selecting a Custom Condition for your use case When Terraform evaluates custom conditions during the plan and apply cycle.Writing effective condition expressions and error messages.Creating preconditions and postconditions for resources, data sources, and outputs (Terraform v1.2.0 and later).Creating validation conditions for input variables (Terraform v0.13.0 and later).Creating checks with assertions to verify your infrastructure as a whole (Terraform v1.5.0 and later).Try the Validate Modules with Custom Conditions tutorial to learn how to use other custom conditions. Hands On: Try the Validate Infrastructure Using Checks tutorial to learn how to use check blocks. They also return useful information about errors earlier and in context, helping consumers more easily diagnose issues in their configurations. Custom conditions can capture assumptions, helping future maintainers understand the configuration design and intent. For example, you can add a condition to an input variable that checks whether incoming image IDs are formatted properly. You can create conditions that produce custom error messages for several types of objects in a configuration.
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