ReadMeFeed / Community knowledge
Real questions. Useful conversations. Find the people who know your stack.
Cloud & infrastructure · #aws
Learn how DynamoDB On‑Demand capacity automatically scales to handle traffic spikes, see a worked flash‑sale example, and understand when it’s cheaper than provisioned mode.
S3 Batch Operations replaces fragile list-and-loop scripts with a manifest-driven job that copies, tags, restores, or invokes Lambda across millions of objects — with a per-object completion report.
S3 Object Lock governance mode enforces WORM retention while letting a tightly scoped admin role bypass it when needed. Here's the minimal design, trust boundaries, checks, and when to switch to compliance mode.
Packer post-processors can upload artifacts to S3 and trigger a CloudFormation stack update in the same template, closing the manual gap between build and deployment. Here's the pattern, the IAM gotchas, and how to verify it.
Learn how to use IAM policy simulation to verify least‑privilege permissions before granting them, including requirements, a minimal design, trust boundaries, operational checks, failure modes, and a concrete example.
Learn how to use Packer HCL2 and the amazon-ebs builder to automate the creation of consistent, reproducible Amazon Machine Images (AMIs) and eliminate configuration drift.
Learn how Terraform's for_each meta-argument lets you create multiple similar resources from a map or set, reducing duplication and giving precise control over each instance.
RDS read replica lag has four common causes — big primary transactions, an undersized replica, competing reads, or network latency. Here's how to tell them apart and fix each.
Internal metrics can't see expired certs, DNS failures, or broken pages your users hit. CloudWatch Synthetics canaries probe your app from outside on a schedule — here's how to set one up, alert on it, and avoid false positives.
dynamodb
terraform