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Home/Questions/Cloud/Tools/Describe an AWS EC2 instance and how IAM roles/policies enhance security.

Describe an AWS EC2 instance and how IAM roles/policies enhance security.

Cloud/Toolseasy0.5 min read

Architectural logic: EC2 = compute; IAM roles = identity without long-lived keys. Why roles matter: Embedded access keys are a top breach vector; roles use instance metadata for temporary credentials that rotate automatically. Flow: Attach role at launch → app uses default...

🤖 Analyze Your Answer
Frequency
Low
Asked at 1 company
Category
179
questions in Cloud/Tools
Difficulty Split
104E|27M|48H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Chryselys
Interview Pro Tip

Red Flag: Mentioning storing AWS keys in config files or env vars. Pro-Move: 'Every EC2 gets an instance profile; we use permission boundaries to limit role escalation—zero keys in code.'

Key Concepts Tested
etl

Why This Question Matters

This easy-level Cloud/Tools question appears frequently in data engineering interviews at companies like Chryselys. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (etl) will help you answer variations of this question confidently.

How to Approach This

Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.

Expert Answer
100 words

Architectural logic: EC2 = compute; IAM roles = identity without long-lived keys. Why roles matter: Embedded access keys are a top breach vector; roles use instance metadata for temporary credentials that rotate automatically. Flow: Attach role at launch → app uses default credential chain (boto3, SDK) → no keys in code. Policies define S3, Secrets Manager, etc. Scalability: One role can serve many instances; policies scale via JSON. Cost: No extra cost for roles. Security: Principle of least privilege; no root; CloudTrail for audit. Example: ETL host role with s3:GetObject, s3:PutObject on specific bucket—attach at launch, app works without config.

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