terraform

abstract

Terraform is a program which tracks and updates cloud-computing resources.

Repositories are folders containing source code files in Terraform's configuration language.
Each module in a repository is defined by main.tf, outputs.tf, and variables.tf files.
Resources like buckets, computers, and networks are declared in .tf files.
Plugins for various cloud providers are used to provision resources.
Text template files can substitute strings when commands are run.
State can be stored in local or remote .tfstate files.

`terraform apply [FOLDER]`	update all resources declared in [FOLDER]
`terraform console [FOLDER]`	start interactive console (for debugging)
`terraform destroy [FOLDER]`	deactivate every resource declared in [FOLDER]
`terraform fmt [FOLDER]`	autoformat all `.tf` files in [FOLDER]
`terraform init [FOLDER]`	install modules and do any necessary initialization
`terraform output [VARIABLE]`	show output variable(s)
`terraform plan [FOLDER]`	predict what `apply [FOLDER]` will do
`terraform show`	show current state (might include secrets!)
`terraform taint [RESOURCE]`	mark [RESOURCE] as broken, stale, and/or unsafe
`terraform untaint [RESOURCE]`	undo `terraform taint [RESOURCE]`

Autoformat staging folder and check for errors.

terraform fmt staging
terraform validate staging

Save an execution plan for the staging folder, then show the plan in JSON format.

terraform plan -out myplan staging
terraform show -json myplan

Destroy and rebuild some_resource which was declared in the staging folder.

terraform taint some_resource
terraform apply staging

Apply changes to staging folder without being prompted to confirm.

terraform apply -auto-approve staging