When you run docker run with an image name (e.g., ubuntu) without additional options, what happens?

When you run docker run with an image name (e.g., ubuntu) without additional options, what happens?

• A. A new container is started using the specified image
• B. Docker builds a new image
• C. The image is pulled to the registry
• D. The container is stopped

Answer: (A)

Starting a new container from the given image is what happens. When you run docker run with an image name, Docker creates a fresh container based on that image and then starts it. If the image isn’t already present locally, Docker will pull it from the registry (like Docker Hub) first, then create and run the container. No image is built, no registry push occurs, and no existing container is affected. The container runs the image’s default command unless you override it with options.

Starting a new container from the given image is what happens. When you run docker run with an image name, Docker creates a fresh container based on that image and then starts it. If the image isn’t already present locally, Docker will pull it from the registry (like Docker Hub) first, then create and run the container. No image is built, no registry push occurs, and no existing container is affected. The container runs the image’s default command unless you override it with options.