Bird
0
0

After deploying green containers, you notice an error: port already in use. What is the best fix?

medium📝 Troubleshoot Q7 of 15
Docker - Production Patterns
After deploying green containers, you notice an error: port already in use. What is the best fix?
ARename green containers
BStop blue containers before starting green containers
CRebuild green containers with a different image tag
DDelete blue containers immediately
Step-by-Step Solution
Solution:

  1. Step 1: Understand port conflict cause

    Both blue and green containers try to bind the same port on the host.

  2. Step 2: Resolve by stopping blue containers first

    Stopping blue frees the port so green can bind it without conflict.

  3. Final Answer:

    Stop blue containers before starting green containers -> Option B

  4. Quick Check:

    Port conflicts fixed by stopping old containers [OK]
Quick Trick: Stop old containers to free ports before new start [OK]
Common Mistakes:
  • Renaming containers does not fix port conflicts
  • Rebuilding images does not change port bindings
  • Deleting containers immediately risks downtime

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Docker Quizzes
Docker Security - Content trust and image signing - Quiz 5medium Docker Swarm - Rolling updates - Quiz 13medium Docker in CI/CD - Running tests in containers - Quiz 9hard Docker in CI/CD - Why Docker in CI/CD matters - Quiz 13medium Image Optimization - Distroless images concept - Quiz 8hard Image Optimization - Squashing layers - Quiz 4medium Image Optimization - Scratch base image for minimal containers - Quiz 7medium Logging and Monitoring - Docker logging drivers - Quiz 15hard Logging and Monitoring - Container metrics collection - Quiz 14medium Production Patterns - Sidecar container pattern - Quiz 14medium