Created
May 2, 2022 17:51
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Input Variables per Local Terraform Workspace
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workspace_variables = { | |
dev = { | |
instance_count = 2 | |
ami_id = "ami-abc123" | |
instance_type = "t2.micro" | |
} | |
test = { | |
instance_count = 3 | |
ami_id = "ami-a1b2c3" | |
instance_type = "t2.medium" | |
} | |
prod = { | |
instance_count = 5 | |
ami_id = "ami-1a2b3c" | |
instance_type = "t2.large" | |
} | |
} |
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resource "aws_instance" "this" { | |
count = local.instance_count | |
ami = local.ami_id | |
instance_type = local.instance_type | |
tags = { | |
Name = "project-xyz-${terraform.workspace}-${count.index}" | |
} | |
} |
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variable "instance_count" { | |
type = number | |
default = null | |
} | |
variable "ami_id" { | |
type = string | |
default = null | |
} | |
variable "instance_type" { | |
type = string | |
default = null | |
} | |
variable "env" { | |
type = string | |
default = null | |
} | |
variable "workspace_variables" { | |
type = map(object({ | |
instance_count = number | |
ami_id = string | |
instance_type = string | |
})) | |
default = {} | |
} | |
locals { | |
default_vars = lookup(var.workspace_variables, terraform.workspace, { | |
instance_count = 2 | |
ami_id = "ami-abc123" | |
instance_type = "t2.micro" | |
}) | |
instance_count = var.instance_count != null ? var.instance_count : local.default_vars["instance_count"] | |
ami_id = var.ami_id != null ? var.ami_id : local.default_vars["ami_id"] | |
instance_type = var.instance_type != null ? var.instance_type : local.default_vars["instance_type"] | |
} |
Ahhh ok that makes sense.
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It's not a bug, it's a feature ;) Anyway, you are right, your code suggestion makes it better! The reason optionals aren't in here is because they were still an experimental feature in Terraform when I wrote this.
Also, the defaults aren't useless. When you are not using a vars file or input variables at all, they will kick in. As the code is now, it's all or nothing on the vars file.