workspaces-more-examples

Example #1

resource "aws_instance" "example" {
  ami           = "ami-0fb653ca2d3203ac1"
  instance_type = terraform.workspace == "prod" 
                  ? "m4.large" 
                  : "t2.micro"
  tags = {
    Name = "example-server-${terraform.workspace}"
  }
}

# tag will be - example-server-dev in the dev environment and example-server-stage in the stage environment
# instance type will also be different in different environments, so in production its m4.large else t2.micro
# code uses ternary notation (CONDTION ? TRUEVAL : FALSEVAL) to pick an instance type

Example #2

Above code for instance type is good if we two options to choose. What if we have dev/test/prod/staging etc...

locals {
  instance_types = {
    dev   = "t2.micro"
    test  = "t2.large"
    stage = "t2.small"
    prod  = "m4.large"
  }
}
resource "aws_instance" "example" {
  ami           = "ami-0fb653ca2d3203ac1"
  instance_type = local.instance_types[terraform.workspace]
  tags = {
    Name = "example-server-${terraform.workspace}"
  }
}

EXTRA - Its a good idea to keep you state file on remote backend like S3  

terraform {
  backend "s3" {
    bucket = "example-bucket"
    region = "us-east-2"
    key    = "example/terraform.tfstate"
  }
}