===== Workflow =====
<code>
# First time setup:
docker-compose build    # Builds your custom image from Dockerfile
docker-compose up -d    # Starts containers using your custom image

# If you change the Dockerfile later:
docker-compose build    # Rebuild the image
docker-compose up -d    # Recreate containers with new image

# Or do both at once:
docker-compose up -d --build
</code>

===== File Operations =====
  * copy files to docker container: ''docker cp foo.txt container_id:/foo.txt''
  * copy files from docker container: ''docker cp container_id:/foot.txt foo.txt''
  * prune unneeded files (save disk space): ''sudo docker system prune -a -f''