Many AWS cost optimization guides stress the importance of tagging resources and using Cost Allocation Tags, but little advice is given on implementing this effectively. After more than a year of refining a chaotic AWS environment, I've found that having basic tags isn't the challenge; the real difficulty lies in structuring the right tags in a way that yields useful insights about spending. We've moved from a vague tagging approach to a method that allows us to analyze costs down to the feature level. Here are our strategies:
1. **Three Essential Tags**: We made it mandatory to use three tags on every resource:
- **Environment**: Specify whether it's production, staging, development, or sandbox.
- **Service**: Name the service based on your operations (like "payment-processor" rather than AWS services like "RDS"). This tag is crucial for understanding costs associated with specific services.
- **Team**: Identify who will respond when issues occur or costs spike.
2. **Narrowing Down Tags**: Initially, we implemented 12 mandatory tags, but compliance was low. By reducing to three must-have tags and five optional ones, compliance surged to about 95%.
3. **Enforcement During Creation**: We enforce tagging upon resource creation through OPA policies with Terraform, which means that if the required tags are not included, the resource cannot be created. At the AWS Organization level, we block the creation of resources that lack these tags altogether.
4. **Meaningful Reporting**: We generate a monthly report highlighting any service where costs increased by more than 30%. This is powerful if tagging is consistent since it prompts relevant conversations about cost surges at the service level.
5. **Handling Shared Infrastructure**: We still grapple with tagging shared resources effectively. Current practice involves tagging with the primary consumer, but we know this isn't perfectly accurate. Looking for better methods to address shared resources is ongoing.
4 Answers
I personally think tags have their place, but they aren't the whole solution, especially with the shared resources issue you mentioned. I've found it more effective to manage different projects through separate accounts. That way, ownership and accountability are clearer—each team can have their own account, making it easier to track costs. Plus, you can maintain proper governance this way without relying solely on tagging.
I see where you're coming from! I'd suggest keeping your base tag structure while also documenting service ownership externally. Things change fast in organizations, so relying solely on tagging for ownership can lead to confusion down the line. A service catalog could help manage ownership info without complicating tag management.
You’ve laid out some solid practices! Just a thought: if shared resources are creating a headache for tag accuracy, consider implementing a secondary system where you can track costs independently. That way, different services can be accounted for more effectively, despite sharing resources.
It sounds like you're doing a great job defining your tagging strategy! For shared resources, what works for us is tagging all consumers. This way, when costs fluctuate, you at least know who to talk to about it. It may not be perfect, but it does help provide some insight into where costs are coming from.
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