This sub-project contains terraform code to understand the concept of meta-argument for_each and for expression with the help of resource deployment on Google Cloud Platform.

  • The for_each meta-argument accepts a map or a set of strings, and creates an instance for each item in that map or set.
  • In blocks where for_each is set, an additional each object is available in expressions, so you can modify the configuration of each instance. each.key — The map key (or set member) corresponding to this instance. each.value — The map value corresponding to this instance. (If a set was provided, this is the same as each.key.)

Prerequisites

All the prerequisites mentioned in top level README file must be fulfilled for successful execution of code.

Code Execution

To execute the terraform code, go to command prompt and then run the following commands:

  • [Required] terraform init # To initialize the terraform working directory.
  • [Optional] terraform validate # To validate the terraform configuration.
  • [Optional] terraform fmt # To format the terraform configuration to a canonical format and style.
  • [Optional] terraform plan # To create an execution plan for terraform configuration files.
  • [Required] terraform apply -auto-approve # To execute the actions proposed in a terraform plan to create, update, or destroy infrastructure.
  • [Optional] terraform destroy -auto-approve # To destroy the created infrastructure. Specific resources can be destroyed using resource targetting.

References

  • https://developer.hashicorp.com/terraform/language/meta-arguments/for_each