/terraform

Primary LanguageHCLGNU General Public License v3.0GPL-3.0

Terraform

Cheat Sheet

Basic commands

terraform init

terraform plan

terraform apply

terraform destroy

terraform output

commands with variable

terraform plan -var-file=<filename.tfvars>

terraform apply -var-file=<filename.tfvars>

terraform destroy -var-file=<filename.tfvars>

Variables

There is two type of variables.

  1. simple value

    • string
    • number
    • bool

  2. Collection Variable

    • map
    • list
    • set, etc

Locals vs variables

The main difference between locals and variables is their scope and visibility. Locals are only visible within the module or block where they are defined, while variables can be accessed and used throughout the entire configuration. Additionally, variables can be set from the command line or using environment variables, allowing for more flexibility when deploying infrastructure.

Loops

  1. Loops with count
  2. Loops with for_each
  3. for loop

Provisioners

  1. Generic Provisioners

    • file
    • local-exec
    • remote-exec

  2. Vendor Provisioners

    • chef
    • nabitat
    • puppet
    • salt-masterless

Generic Provisioners- Generally vendor independent and can be used with any cloud vendor(GCP, AWS, AZURE)

Vendor Provisioners - It can only be used only with its vendor. For example, chef provisioner can only be used with chef for automating and provisioning the server configuration.

Supporting arguments for file provisioners

  1. source
  2. destination
  3. content

Dynamic Block

dynamic blocks allow you to define a nested block multiple times dynamically based on a variable value. This is useful when you need to create multiple similar resources with different settings.