The Complete Practical Docker Guide - What is Docker Container

The video tutorial explains Docker containers, focusing on creating and managing them using the Hello World example. It covers the concept of image layers, writable layers, and how Docker efficiently manages resources. The tutorial also demonstrates creating multiple containers from the same image, process management, and the steps to remove containers and images from the Docker host.

What is the primary function of the Hello executable file in the Hello World container?

• To stop the container

• To modify image layers

• To print text to the terminal

• To create a new container

What is unique about the writable layer created for each Docker container?

• It cannot be modified

• It is unique to each container

• It is read-only

• It is shared among all containers

What happens when a new container is created from an image?

• A writable layer is added

• A new image is created

• The container is immediately stopped

• The image layers are modified

What determines if a Docker container is considered running?

• If it has an image

• If at least one process is running inside

• If it is listed in Docker Hub

• If it has a writable layer

What happens to a container when its process ends?

• It continues running

• It is stopped by Docker

• It creates a new process

• It is automatically removed

How does Docker efficiently utilize resources on the Docker host?

• By running all containers in a single process

• By reusing image layers and only creating new writable layers

• By creating a new image for each container

• By copying all image layers for each container

What command is used to remove a stopped container?

• docker rm

• docker stop

• docker create

• docker run

What remains on the hard drive after a container is stopped but not removed?

• The writable layer

• The container's processes

• The entire image

• Nothing remains

What is the effect of using the 'docker rmi' command?

• It removes a writable layer

• It stops a running container

• It removes an image

• It creates a new image

What is the state of the Docker host after all images and containers are removed?

• It has no images or containers

• It has only running containers

• It has no writable layers

• It has only stopped containers