Hashicorp Configuration Language: Difference between revisions

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=Output Variable=
=Output Variable=
{{External|https://learn.hashicorp.com/terraform/getting-started/outputs}}
Output variables are a way to organize data to be easily queried and shown back to the Terraform user. Terraform usually stores hundred or thousands of attribute values, but only a few of those are important. Output variables can be used as an input to other [[Terraform Concepts#Module|modules]].
Also see: {{Terraform_Operations#Output|terraform output}}

Revision as of 23:10, 13 November 2019

External

Internal

Overview

Block

Interpolation Expression

Input Variable

variable "region" {
  default = "us-east-1"
}

To use the variable:

region= var.region

This is also an interpolation expression, prefixed with “var.”

Variables can be assigned in multiples way, and this is the descending order of precedence:

  • command-line flags (-var = ‘region=something’)
  • from a file (.tfvars, -var-file=…) terraform.tfvars or *.auto.tfvars in the current directory are automatically loaded. Multiple -var-file can be used.
  • From environment variables: TF_VAR_name. This can only be used for string variables.
  • UI Input
  • Variable defaults (“default” keyword).

Lists

https://learn.hashicorp.com/terraform/getting-started/variables#lists

Maps

https://learn.hashicorp.com/terraform/getting-started/variables#maps

Output Variable

https://learn.hashicorp.com/terraform/getting-started/outputs

Output variables are a way to organize data to be easily queried and shown back to the Terraform user. Terraform usually stores hundred or thousands of attribute values, but only a few of those are important. Output variables can be used as an input to other modules.

Also see: Template:Terraform Operations