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Terraform Quick notes -

Reference - Terraform Registry

Type of terraform providers

  1. Official - Managed by terraform.
  2. Verified - Managed by terraform partners.
  3. Community - Managed by users.

Various files can be created

  1. main.tf - Main configuration file containing resource definition.
  2. variables.tf - Contains variable declarations.
  3. outputs.tf - Contains outputs from resources.
  4. provider.tf - Contains provider derfinition.

Terraform Variables

  1. string - a sequence of Unicode characters representing some text, like "hello".
  2. number - a numeric value. The number type can represent both whole numbers like 15 and fractional values like 6.283185.
  3. bool - a boolean value, either true or false. bool values can be used in conditional logic.
  4. list (or tuple) - a sequence of values, like ["one", "two"]. Elements in a list or tuple are identified by consecutive whole numbers, starting with zero.
  5. map (or object) - a group of values identified by named labels, like {name = "Mabel", age = 52}.

Terraform loads variables in the following order, with later sources taking precedence over earlier ones:

  • Environment variables
  • The terraform.tfvars file, if present.
  • The terraform.tfvars.json file, if present.
  • Any *.auto.tfvars or *.auto.tfvars.json files, processed in lexical order of their filenames.
  • Any -var and -var-file options on the command line, in the order they are provided. (This includes > variables set by a Terraform Cloud workspace.)

Specify explicit dependency

  • depends_on - depends_on = [(Resource type).(Resource name)]

Lifecycle block

The arguments available within a lifecycle block are create_before_destroy, prevent_destroy, ignore_changes, and replace_triggered_by

  • create_before_destroy - bool
  • prevent_destroy - bool
  • ignore_changes - list of attribute names
  • replace_triggered_by - list of resource or attribute references

Main commands:

  • init - Prepare your working directory for other commands
  • validate - Check whether the configuration is valid
  • plan - Show changes required by the current configuration
  • apply - Create or update infrastructure
  • destroy - Destroy previously-created infrastructure

All other commands:

  • console - Try Terraform expressions at an interactive command prompt
  • fmt - Reformat your configuration in the standard style
  • force-unlock - Release a stuck lock on the current workspace
  • get - Install or upgrade remote Terraform modules
  • graph - Generate a Graphviz graph of the steps in an operation
  • import - Associate existing infrastructure with a Terraform resource
  • login - Obtain and save credentials for a remote host
  • logout - Remove locally-stored credentials for a remote host
  • output - Show output values from your root module
  • providers - Show the providers required for this configuration
  • refresh - Update the state to match remote systems
  • show - Show the current state or a saved plan
  • state - Advanced state management
  • taint - Mark a resource instance as not fully functional
  • test - Experimental support for module integration testing
  • untaint - Remove the 'tainted' state from a resource instance
  • version - Show the current Terraform version
  • workspace - Workspace management