Terraform environments with locals

Sample usage of terraform locals and terraform workspace to isolate environment.

Create workspace

$ terraform workspace new dev
Created and switched to workspace "dev"!

You're now on a new, empty workspace. Workspaces isolate their state,
so if you run "terraform plan" Terraform will not see any existing state
for this configuration.

$ terraform workspace list

  default
* dev

(*) means active workspace.

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Usage

$ terraform workspace select default
$ terraform plan

result:

(+) instance_type = "t2.micro"

Plan: 1 to add, 0 to change, 0 to destroy.

$ terraform workspace select dev
$ terraform plan

result:

(+) instance_type = "t2.small"

Plan: 3 to add, 0 to change, 0 to destroy.