DevOps Interview Questions
Practical, scenario-driven interview prep — from foundational concepts to real production troubleshooting. Every question and answer is original and Git-sourced.
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- A Lambda function times out for about 2% of invocations, seemingly at random, but works fine when you test it manually. How would you track down the cause?Intermediate
- A security scanner just flagged one of your production S3 buckets as publicly readable. Walk through how you'd respond in the first hour and prevent a repeat.Advanced
- A backup script runs perfectly when you execute it by hand, but fails silently every night when cron runs it. How would you debug it?Beginner
- A team wants zero-downtime deploys with fast rollback for a high-traffic payments API. Would you recommend blue-green or canary deployment, and why?Advanced
- Two containers on the same Docker host can't talk to each other over the network, even though both are running. How would you debug the connection?Beginner