mirror of
https://github.com/Sea-Haven-Industries/engineering-handbook.git
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bf161add07
- Pin blessed aws-cdk-lib version (2.253.1) with upgrade procedure - Update Lambda runtime default from Node 22 to Node 24 - Rewrite CI/CD page to reflect GitHub Actions reusable workflows (was still referencing CodePipeline/CodeBuild)
57 lines
2 KiB
Markdown
57 lines
2 KiB
Markdown
# AWS Infrastructure
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## IaC Strategy
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- **SAM** is the default for new serverless stacks (Lambda + API Gateway + DynamoDB)
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- **CDK** only for complex infrastructure (ECS, VPCs, multi-service compositions)
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- Every deployed resource should be managed by CloudFormation
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- No manually-created Lambdas, roles, or other resources outside of IaC
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## Lambda Defaults
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These apply to every Lambda in every project. Verify, don't assume.
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| Setting | Value |
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|---|---|
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| Runtime | Python 3.12 or Node 24.x |
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| Architecture | arm64 |
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| Log retention | 60 days (explicit in IaC template) |
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| Naming | kebab-case, matching the stack name prefix |
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Never rely on the CloudWatch default for log retention. Always set `RetentionInDays` explicitly in the template.
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## CDK Version Policy
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Pin `aws-cdk-lib` to a known-good version. The current blessed version is **2.253.1**.
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Why: aws-cdk-lib bundles transitive dependencies (`inBundle: true`). Certain versions (e.g., 2.254.0) break `npm ci` with phantom missing-package errors. npm `overrides` cannot fix bundled deps. Always test `npm ci` locally before pushing a version bump.
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When upgrading, verify on a branch first:
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1. Update `package.json` to the new version
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2. Run `rm -rf node_modules package-lock.json && npm install`
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3. Run `npm ci` — if it fails, the version is not safe
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4. Run `npx cdk synth` — if it fails, the version is not safe
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## CloudFormation Outputs
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Every stack should export:
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- Function ARNs
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- Any externally-consumable URLs (API Gateway endpoints, etc.)
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## S3
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- Every non-CloudFormation bucket must have `Purpose` and `ManagedBy` tags
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- Define lifecycle policies in the IaC template
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- Use Glacier Deep Archive for archival data
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## README
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Every repo must have a README that accurately describes:
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- Project architecture
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- Lambdas and services
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- Data flow
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- Configuration requirements
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Update the README in the same commit where functionality changes. If a README is missing or outdated when you start working on a project, fix it as part of the current work.
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