Potential breaking(surprise) changes introduced by resource block

1. Adding a new resource without count or for_each for conditional creation, or creating by default
2. Adding a new argument assignment with a value other than the default value provided by the provider’s schema
3. Adding a new nested block without making it dynamic or omitting it by default
4. Renaming a resource block without one or more corresponding moved blocks
5. Change resource’s count to for_each, or vice versa

Terraform moved block could be your cure.

From Terraform AzureRM 3.0, the default value of prevent_deletion_if_contains_resources in provider block is true. This will lead to an unstable test because the test subscription has some policies applied, and they will add some extra resources during the run, which can cause failures during destroy of resource groups.

newres is a command-line tool that generates Terraform configuration files for a specified resource type. It automates the process of creating variables.tf and main.tf files, making it easier to get started with Terraform and reducing the time spent on manual configuration.

Module owners MUST use lower snake_casing for naming the following:

• Locals
• Variables
• Outputs
• Resources (symbolic names)
• Modules (symbolic names)

For example: snake_casing_example (every word in lowercase, with each word separated by an underscore _)

Module owners MUST use the below tooling for unit/linting/static/security analysis tests. These are also used in the AVM Compliance Tests.

• Terraform
  • terraform <validate/fmt/test>
• terrafmt
• Checkov
• tflint (with azurerm ruleset)
• Go
  • Some tests are provided as part of the AVM Compliance Tests, but you are free to also use Go for your own tests.

For the definition of resources in the same file, the resources be depended on SHOULD come first, after them are the resources depending on others.

We can use count and for_each to deploy multiple resources, but the improper use of count can lead to anti pattern .

You can use count to create some kind of resources under certain conditions, for example:

There are 3 types of assignment statements in a resource or data block: argument, meta-argument and nested block. The argument assignment statement is a parameter followed by =:

The meta-arguments below SHOULD be declared on the top of a module block with the following order:

1. source
2. version
3. count
4. for_each

blank lines will be used to separate them.