Technology exists to simplify human challenges, and as tech professionals, we must also leverage it to solve our own problems. One common area we deal with daily is Infrastructure as Code (IaC), raising frequent questions such as which tool is betterAWS CDK, CloudFormation, Serverless Framework, or Terraform?
However, we often overlook the foundational principles of IaC, like recovery, fast deployment, resiliency, and minimizing time-to-market (TTM). For instance, if you decide to implement a multi-regional failover, can it be deployed effortlessly? How quickly can you recover if your production environment, region, or accounts go down?
Common Roadblocks
To navigate the complexities of IaC, vigilance and discipline are essential. Lets explore some common roadblocks and how to address them effectively:
Historical manual interventions
Lack of configurable and parameterized code
Lost secrets that cannot be restored
Hard dependencies between stacks
Circular dependencies
Human Actions
Human intervention is a regular part of our jobsquick fixes to temporary issues often lead to future automation. Unfortunately, these "notes for later" sometimes get forgotten, turning into major pain points down the road. Identifying these recurring manual actions is key to saving time, effort, and frustration in the future.
Recommendations:
Use tags to identify automated resources.
Regularly explore untagged resources to detect those not yet automated.
Review generated IaC templates to find missing tags.
Foster a tech-driven culture within your team.
Configuration Shortcomings
One frequent issue in IaC is hardcoding variables in Stacks or Nested Stacks, which can complicate configuration management. Whether it's a queue name, topic name, or HTTP endpoint, manually searching through different IaC tools like CloudFormation or AWS CDK can slow you down. Centralizing all dependencies simplifies future changeslike shifting from "me.mycompany.com" to "me.mycompany.org"by allowing you to quickly locate and update configurations.
Losing Secrets
Managing secrets securely is crucial. While storing sensitive information like API keys or credentials in a secret manager is helpful, what happens if your account gets lost? The solution is to maintain a backup of all secrets outside the software environment, ideally in a dedicated vaultthis is more of an organizational best practice.
Managing Dependencies
Dependencies in IaC can be categorized into three levels:
Light Dependencies: Passed to the environment variables (e.g., Lambda), these wont break your deployment but could affect testing and runtime.
Soft Dependencies: Tied to infrastructure services but manageablelike subscribing to an SNS topic, though permission issues may arise from unautomated historical actions.
Hard Dependencies: These will prevent deployment if not properly handled. For example, an EventBridge rule may require an EventBus that isnt yet deployed. The key here is identifying priority stacks and documenting these relationships, often using dependency graphs or architecture diagrams.
Circular Dependencies
Over time, as requirements evolve, stacks can develop circular dependencies. Imagine planning a production release only to find that it fails due to a circular dependency between two stacks. For instance, Stack A may require a CloudFront distribution that needs an upstream domain name for CORS, but the record set is managed in another stackleading to a deadlock.
To avoid such issues, actively manage and mitigate circular dependencies. Divide stacks if needed or apply predictable naming conventions. For example, using "products.mycompany.com" instead of introducing direct dependencies between stacks can eliminate such problems.
Conclusion
By proactively addressing these common challenges, we can build more resilient, efficient, and scalable infrastructure, reducing downtime and increasing the speed of recovery when issues arise.
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