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How well do you know Docker images and Dockerfiles?

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How well do you know Docker images and Dockerfiles?

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Questions and Answers

What are Docker images?

Pre-built packages containing only the application code

Pre-built packages containing the operating system only.

Pre-built packages containing only the application dependencies.

Pre-built packages containing everything needed to run an application. (correct)

How can Docker images be obtained?

They can only be created locally.

They can only be downloaded from public registries.

They can only be downloaded from private registries.

They can be downloaded from public or private registries, or created locally. (correct)

What is a Dockerfile used for?

To run the application.

To create the container.

To download the image

To define the image (correct)

What is the purpose of the first step in creating a Docker image?

To create a simple Docker image that runs a simple web server. Signup and view all the answers

What command is used to build a Docker image?

<code>docker build</code> Signup and view all the answers

What is the purpose of the third step in creating a Docker image?

To use environment variables in the image Signup and view all the answers

What command is used to start a container based on a Docker image?

<code>docker run</code> Signup and view all the answers

Study Notes

Docker images are pre-built packages that contain everything needed to run an application.
Images can be downloaded from public or private registries, or created locally.
Custom Docker images can be created to add value to applications.
A Dockerfile is used to define the image.
The first step is to create a simple Docker image that runs a simple web server.
The second step is to add custom software to the Docker image.
The third step is to use environment variables in the Docker image to customize its behavior.
The nginx web server and curl utility are used as examples in the lab.
The docker build command is used to build the Docker image.
The docker run command is used to start a container based on the Docker image.

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Description

Test your knowledge on Docker images and how to create custom ones using a Dockerfile. Learn about the docker build and docker run commands, as well as how to use environment variables to customize your images. This quiz covers everything from simple web servers to adding custom software to your Docker images. Get ready to dive into the world of Docker and take your application deployment to the next level.