Interview Questions & Answers

DevOps Interview Questions and Answer – Part 2

October 7, 2019 comments off
  • What DevOps is? Why do we need it?
    • Example of answers:
      • Why do we need it?
        • Increase deployment frequency
        • Lower failure rate of new releases
        • Shortened lead time between fixes
        • Faster mean time to recovery in the event of new release crashing
      • What DevOps is?
        • CALMS
        • C – Culture (promotes collaborative and open culture between Dev and Ops)
        • A – Automation (automate wherever applicable)
        • L- Learning (continuous learning & experimentation)
        • M – Measure (Measure with shared metrics across the Dev and ops for better management)
        • S – Sharing (Shared delivery process across Dev and Ops to build , deploy, maintain and monitor product with mentality of One Team – One Goal)
  • What is the purpose of a post-mortem meeting?
  • What is meant by Continuous Integration?
  • What are the success factors for Continuous Integration?
    • Examples of answers:
      • Maintain a code repository
      • Automate the build
      • Make the build self-testing
      • Everyone commits to the baseline every day
      • Every commit (to baseline) should be built
      • Keep the build fast
      • Test in a clone of the production environment
      • Make it easy to get the latest deliverables
      • Everyone can see the results of the latest build
      • Automate deployment
  • How would you implement CI (continuous delivery) – end to end, including source control, branches, tools, etc. ?
  • What is Continuous Delivery? Continuous Deployment?
  • What is the difference between Continuous Integration, Continuous Delivery and Continuous Deployment?
  • What’s the difference between git and git-hub ? What about git and SVN ?
  • What is git rebase?
  • In Git how do you revert a commit that has already been pushed and made public?
  • What is puppet/chef/ansible used for? What are the advantages over shell scripts ?
  • What do you understand by “Infrastructure as code”? How does it fit into the DevOps methodology? What purpose does it achieve?
  • How do you give your developers access to the production logs ?
  • Tell me about the worst-run/best-run outage you’ve been a part of. What made it bad/well-run?
  • How do you monitor your application ? How do you make sure it is working ? How do you get alerts when it stops working ?
  • What would be the availability and performance metrics for a key value store ? What about for MySQL replication ?
  • How would you deploy software to 5000 systems?
  • What is caching ? Where should a large scale application cache, and what data should be cached ?
Rajesh Kumar
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