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AWS Essentials for Developers

Core AWS services every developer should know: EC2, S3, Lambda, RDS, and IAM fundamentals.

AWSIntermediate

Why

AWS holds 31% of cloud market share. Understanding core services lets you deploy, store, and scale applications without infrastructure teams.

IAM knowledge prevents the #1 cause of cloud breaches: misconfigured permissions.

When

Learn AWS when your company uses it for production, when you need managed databases (RDS), object storage (S3), or serverless functions (Lambda). Start with the Free Tier.

How

1. Set up IAM — create user with programmatic access, attach least-privilege policy 2. Configure CLI — aws configure with access key + secret + region 3. S3 (storage) — aws s3 cp file.txt s3://my-bucket/ (versioning + encryption default) 4. EC2 (compute) — launch instance, SSH via key pair, install app 5. Lambda (serverless) — zip handler, aws lambda create-function, trigger via API Gateway 6. RDS (database) — create PostgreSQL instance, connect via psql 7. CloudWatch — logs, metrics, alarms for all services above

Example

# IAM policy — least privilege for S3 access to one bucket { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": ["s3:GetObject", "s3:PutObject"], "Resource": "arn:aws:s3:::my-app-bucket/*" } ] } # Lambda handler — Node.js import { S3Client, PutObjectCommand } from "@aws-sdk/client-s3"; const s3 = new S3Client({ region: "us-east-1" }); export async function handler(event: { body: string }) { await s3.send(new PutObjectCommand({ Bucket: "my-app-bucket", Key: `data/${Date.now()}.json`, Body: event.body, ContentType: "application/json", })); return { statusCode: 200, body: JSON.stringify({ ok: true }) }; } # Deploy aws lambda create-function --function-name myHandler --runtime nodejs20.x --handler index.handler --zip-file fileb://lambda.zip --role arn:aws:iam::123456:role/lambda-role

Common Problems

  • ⚠Using root account for CLI — should create IAM user, root keys are catastrophic if leaked
  • ⚠S3 bucket public-read — accidentally exposes all uploaded files to the internet
  • ⚠Lambda timeout 3s default — functions processing large files silently fail
  • ⚠Hardcoded region — app breaks when deployed to a different AWS region

Best Practices

  • ✓Use IAM roles, not access keys, for EC2/Lambda — temporary credentials auto-rotate
  • ✓Enable S3 Block Public Access at account level — prevents accidental public buckets
  • ✓Set Lambda timeout + memory explicitly — defaults are too low for most real workloads
  • ✓Use AWS CDK or Terraform, not console clicks — infrastructure must be version-controlled

FAQ

What is AWS Essentials for Developers and what problem does it solve?

Core AWS services every developer should know: EC2, S3, Lambda, RDS, and IAM fundamentals. It lets developers deploy, store, and scale without self-managing infrastructure — a core reference for cloud service selection.

How do I get started with AWS Essentials for Developers in 5 minutes?

Two steps to run it: (1) Set up IAM — create user with programmatic access, attach least-privilege policy; (2) Configure CLI — aws configure with access key + secret + region. Validate on the free tier first, then wire into production.

What is the #1 pitfall with AWS Essentials for Developers?

The most frequent issue is: Using root account for CLI — should create IAM user, root keys are catastrophic if leaked. Run a pre-launch checklist item by item, and add policy/config scanning in CI.

What are the best practices for AWS Essentials for Developers?

Best practices for AWS Essentials for Developers include: Use IAM roles, not access keys, for EC2/Lambda — temporary credentials auto-rotate; Enable S3 Block Public Access at account level — prevents accidental public buckets; Set Lambda timeout + memory explicitly — defaults are too low for most real workloads. The first one — "Use IAM roles, not access keys, for EC2/Lambda — temporary credentials auto-rotate" — should be a team default baked into your IaC templates.

How do I control cost and avoid bill surprises with AWS Essentials for Developers?

Three ways to prevent overspend: (1) tag every resource with env/team and enable billing alarms; (2) set budget thresholds to trigger Slack/email alerts; (3) review idle resources in Cost Explorer regularly and clean them up. Most AWS Essentials for Developers options offer a free tier — validate within free quota before scaling.