The primary purposes of tags are:

  1. To provide human-readable information about the resources
  2. As part of automation
  3. Filter resources

Here are some use cases related to providing human-readable information:

  • Allow a human to semantically understand what a resource is; eg: Name, Version
  • Identify what environment a resource belongs to (staging, prod, etc.); eg: Environment
  • Identify who is responsible for a given resource; eg: Owner, Project, Business Unit, Department
  • Identify which project or product a given resource belongs to; eg: Project
  • Identify whether a resource is managed automatically (CloudFormation, Terraform) or not (human); eg: CreatedBy, ManagedBy

Here are some use cases related to automation:

  • Turn on/off monitoring or some debugging stuff based on tag values; eg: Environment, Version, Project, OptIn, OptOut
  • Start/stop or scale out/in resources based on tag values; eg: DateTime, Customer
  • Apply some automation based on tag values; eg: Environment, DateTime, OptIn, OptOut, Version, Customer, Project
  • Date of an EBS snapshot; eg: DateTime
  • This list could be endless…
  • Run some commands on certain EC2 instances; eg: OS, Environment, Project

Here are some use cases related to filtering resources:

  • Allocate costs to categories, business units, etc.; eg: Owner, Business Unit, Department, Cost Center, Cost Category, Customer
  • See also this for AWS-generated tags that help with cost allocation
  • Build inventories of resources; this is especially useful for resource groups; eg: Project, Environment, Customer, Department

Finally, some other use cases:

Some tips on how to use tags effectively:

  • Settle on a naming and case conventions
  • Apply generously; better to have too many tags than not enough
  • Tags can be changed easily, so just do it and adapt as you go along or when requirements change

See this AWS article for more information: AWS Tagging Strategies.

I work as a freelancer, so if you don’t want to do that kind of things yourself or don’t have the time, just drop me a line to hire me.