How well do you know Docker images and Dockerfiles?

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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)

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)

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

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

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

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

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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.