Terraform HCL Commands

Links: 113 Terraform Index

---

HCL/Terraform Commands

Basics

• Creating a simple file
  • 

resource "local_file" "pet" {
    filename = "/root/pets.txt"
    content = "Hello there"
}

- Argument filename is compulsory for resource type local_file. -
- Some examples of AWS resources: -
-

• A terraform workflow consists of 4 steps:
  • Write the configuration file.
  • Next run the terraform init command.
  • Review the execution plan using the terraform plan command.
  • Apply the changes using the terraform apply command.
• To delete the infrastructure completely run the terraform destroy command.
• Getting the version of modules and terraform after initialising terraform
  • terraform -v
• terraform show: the terraform show command is used to provide human-readable output from a state or plan file.

Other Commands

• terraform validate: To check if the syntax of the terraform files.
• terraform fmt: Format the terraform files.
• terraform show -json: To show the contents of the state file in json format.
• terraform providers: To see a list of all the providers in the current configuration directory.
• terraform output: Prints all the output variables.
  • terraform output variable_name: Printing a specific variable.
• terraform refresh: Used to sync terraform with the real world architecture.
  • Useful when a manual update is made to the resources controlled by terraform.
  • This will only modify the state file.
  • This is automatically run by terraform plan and terraform apply.
    • We can bypass this behaviour by using -refresh=false with the above commands.
• terraform graph: Create a visual representation of dependencies.
  • We need to pass it through a graphing tool.

---

Last updated: 2023-01-06