Dockerfile
Why does instruction order affect cache and risk?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.
Explain decisions
Docker Academy: Senior interview drills
Practise structured answers covering requirements, risks, controls, evidence and recovery.
Images
Why should production deploy by digest?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.
Containers
What actually makes a container different from a VM?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.
Volumes
Why should application state not depend on the writable layer?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.
Networks
What is the difference between expose and publish?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.
Docker Compose
Why is depends_on not always readiness?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.
Registries
How do you prevent untrusted images reaching production?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.
Container Security
What are the highest-value container hardening controls?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.
Image Optimisation
When does image-size optimisation become counterproductive?
Answer framework: Clarify requirements → state assumptions → compare options → control risk → validate → explain rollback.