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❓ FREQUENTLY ASKED QUESTIONS AND TIPS

1. Why aren't my images showing up in Docker Hub?

Check that:

  • 🔐 DOCKER_USERNAME and DOCKER_PASSWORD (or DOCKER_TOKEN) variables are added to Settings > Secrets on GitHub
  • ✅ sudo docker login is run before docker push in the CI pipeline
  • 📤 You are pushing to the right repository: USERNAME/imagename

2. Do I need to specify all files when git add?

No. One command is enough:

git add .

This will add all changes in the current directory and subfolders.

3. Do Docker images take up a lot of space?

Yes. Clean up unnecessary images, containers, and cache:

sudo docker system prune -a

⚠️ Be careful: the command will remove all unused resources.

4. How to update images on the server?

Download the latest version of the image:

sudo docker pull USERNAME/flask-api:latest

Restart containers:

sudo docker compose down && docker compose up -d

5. How to verify that the images were actually updated?

Check the image hash:

sudo docker images | grep flask-api

Or open docker-compose.yml and make sure that the image: with the correct tag is used.

6. What to do if docker-compose is not found?

  • Make sure you are using Docker v20+ (it has docker compose built-in)
  • On older systems: install docker-compose separately or use docker compose (without the hyphen)

7. Why does a container exit quickly?

Check the logs:

sudo docker logs <container_name>

Possible causes:

  • ❌ Code errors (e.g. in app.py)
  • ⚠️ Missing environment variables
  • 🚫 Port already taken

8. How to stop and remove all containers?

sudo docker stop $(docker ps -q)
sudo docker rm $(docker ps -aq)

💡 Or with one command:

sudo docker container prune -f

9. How to check that Nginx is proxying requests correctly?

Check Nginx logs:

sudo docker logs nginx

Make sure that in default.conf: