Well-Architected Reliability

Well-Architected Reliability

This lesson deepens Cloud Fundamentals: AWS Core Services using the same subject areas emphasized by official documentation: AWS docs and Well-Architected: IAM, EC2, Auto Scaling, S3, EBS, RDS, CloudWatch, CLI and operational excellence. The goal is to turn Well-Architected Reliability into a production skill: you should know the concept, the configuration surface, the safety controls, the operational checks, and the rollback path.

Documentation Coverage

• Core terms and object model for this topic.
• Configuration options, defaults, and lifecycle behavior from the docs.
• Security, reliability, and ownership boundaries.
• Validation steps before and after the change.
• Common failure modes and diagnostic signals.

Production Implementation Flow

1. Define the source of truth: Git, configuration, API, state file, or control plane.
2. Design the safest repeatable workflow, including dry-run or plan output where possible.
3. Attach CI/CD, policy, security, and peer-review gates.
4. Observe metrics, logs, events, or traces after the change.
5. Document rollback, escalation owner, and evidence for the change record.

aws sts get-caller-identity
aws resourcegroupstaggingapi get-resources --tag-filters Key=Environment,Values=prod
aws cloudwatch describe-alarms --state-value ALARM

Mastery Standard

You understand Well-Architected Reliability when you can explain it, configure it, test it, monitor it, and recover it under incident pressure without relying on undocumented manual steps.