Logging — Complete Guide
Logging — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of AWS Cloud Tutorial on Toolliyo Academy.
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AWS Cloud Tutorial · Lesson 63 of 100
Logging
Core services ✓ → Projects
Projects · 2 — Deploy · ~10 min · AWS — Observability & Security
What is this?
Centralized logging on AWS sends application and service logs to CloudWatch Logs, optionally forwarded to S3 or OpenSearch for search.
Why should you care?
AwsVerse compliance requires immutable audit logs retained and searchable by transaction ID.
See it live — copy this example
Run in AWS CloudShell / local AWS CLI v2, or follow the matching steps in the AWS Console (Free Tier).
aws logs create-log-group \
--log-group-name /awsverse/audit/payments \
--retention-in-days 90 \
--tags Environment=prod,DataClass=auditWhat happened?
- Creates a named log group with 90-day retention and tags.
- Lambda and ECS task roles need logs:CreateLogStream permission.
Practice next
- Create log group per service domain.
- Configure JSON structured logging in app.
- Query with Logs Insights: fields @timestamp, @message | filter orderId='ORD-1'.
- Subscribe log group to Kinesis Firehose → S3 archive.
- Create metric filter on ERROR pattern.
Remember
CloudWatch Logs central store. Structured JSON eases queries. Set retention per sensitivity.
AwsVerse audit trail
Regulator asks for all actions on account X.
Outcome: Logs Insights query returns filtered audit entries in minutes.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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