Top 10 high-level EC2 scenario-based questions to challenge your AWS & DevOps skills

 Docker Issues & Troubleshooting Guide

1. Container Exiting Immediately

Issue: The container starts and stops immediately. Solution:

Check logs using: docker logs <container_id>

Ensure the entrypoint script has execute permissions: chmod +x entrypoint.sh

Use interactive mode: docker run -it <image_name> /bin/bash

2. Port Conflicts

Issue: Unable to bind to a port due to conflicts. Solution:

Check running containers using: docker ps

Run container on a different port: docker run -p 8081:80 <image_name>

Stop conflicting container: docker stop <container_id>

3. Image Build Failures

Issue: docker build fails due to syntax errors or cache issues. Solution:

Check Dockerfile syntax carefully.

Use docker build --no-cache -t <image_name> . to rebuild from scratch.

Run docker history <image_name> to analyze layers.

4. Storage Issues (No Space Left)

Issue: Disk space fills up due to unused images and containers. Solution:

Analyze disk usage: docker system df

Remove stopped containers: docker container prune

Delete unused images: docker image prune -a

Remove all unused resources: docker system prune -a

5. Networking Problems

Issue: Containers cannot communicate with each other. Solution:

List networks: docker network ls

Inspect container network: docker inspect <container_id>

Ensure correct network mode: docker network connect <network_name> <container_id>

Restart Docker service: systemctl restart docker

Conclusion Docker simplifies containerized applications, but troubleshooting issues efficiently is key to maintaining a smooth workflow. Keep this guide handy and share your experiences!