= Cloud/Terraform/Tags =

 * How to design handling cloud tags for modules ?
 * Goals:
   * Enforce some tags
   * Extend tags for specific components, VM, Nic, Disk etc.

 * Plan:
   * Split tags into
     * tags_  << Start with tags so they all group together.
     * tags_required << Enforce with a TF object
     * tags_additional  << Optional additional for ALL
     * tags_vm << Optional additional for VM's
     * tags_volume << Optional additional for volume

 * Example {{{
variable "tags_required" {
  description = "EC2 instance standard tags"
  type = object({
    owner         = string
    application   = string # description = "Mercury AWS standard tag. Tag value to be assigned to tag key Application."
    cost_code     = string # description = "Mercury AWS standard tag. Tag value to be assigned to tag key CostCode."
    cost_code_sub = string # description = "Mercury AWS standard tag. Tag value to be assigned to tag key CostCode-Sub."
    business_unit = string # description = "Mercury AWS standard tag. Tag value to be assigned to tag key BusUnit."
    aws_region    = string
    environment   = string
  })
}

variable "tags_additional" {
  description = "Additional taggs appended to tags in tf-mod-common-tags. (=additional_tags)"
  type        = map(string)
  default     = {}
}

variable "tags_vm" {
  description = "EC2 instance custom tags. (= custom_tags)"
  type        = map(string)
  default     = {}
}

variable "tags_volume" {
  description = "Additional tags just for EBS volumes (=custom_volume_tags)"
  type        = map(string)
  default     = {}
}

}}}

=== Ignore tag changes ===
 * All {{{
  lifecycle {
    ignore_changes = [tags, ]
  }
}}}
 * Specific tag {{{
  lifecycle {
    ignore_changes = [tags.backup_date, ]
  }

}}}
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CategoryTerraform