Q: Your Docker build fails with "no space left on device" on the CI server. What do you do?
Clean up: docker system prune -af removes unused images, containers, volumes, build cache. docker images | grep '<none>' finds dangling i...
#Docker #Docker #L2 #Containers #Linux
🎙️ Candidate Opening & Architectural Context
""In an interview, I explain how we diagnosed container runtime failures without guessing. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
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Production Solution & Architecture
Clean up: docker system prune -af removes unused images, containers, volumes, build cache. docker images | grep ' finds dangling images. Set up automatic cleanup cron: docker system prune -f --filter "until=24h". Long term: add more disk or use BuildKit with a cache limit.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Clean up: docker system prune -af removes unused images, containers, volumes, build cache. docker images | grep '' finds dangling ."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: Clean up: docker system prune -af removes unused images, containers, volumes, build cache. dock
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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