Chapter 2 (Docker)

What is the purpose of a Dockerfile?

• To define the steps for building a Docker image
• To run a Docker container
• To manage Docker networks
• To store Docker volumes

Which Dockerfile instruction is used to specify the base image for a new image?

• FROM
• RUN
• COPY
• CMD

What is the role of the RUN instruction in a Dockerfile?

• To copy files into the image
• To execute commands during the image build process
• To set environment variables
• To define the default command to run when a container starts

Which Dockerfile instruction is used to define the command that will be executed when a container starts from the image?

• ENTRYPOINT
• CMD
• RUN
• EXEC

What is the purpose of the .dockerignore file?

• To specify which files and directories should be excluded from the build context
• To define the build arguments for a Docker image
• To set environment variables during the build process
• To configure the network settings for a Docker container

Which of the following are valid Dockerfile instructions?

• ADD
• ENV
• LABEL
• PUSH

Which of the following statements about Docker image layers are true?

• Each instruction in a Dockerfile creates a new layer in the image
• Docker layers are read-only
• Docker layers can be shared between multiple images
• Docker layers can be modified after the image is built

Which of the following practices can help optimize Docker images?

• Using multi-stage builds
• Minimizing the number of layers in the image
• Cleaning up unnecessary files and dependencies
• Including all development tools and libraries in the final image

The COPY instruction in a Dockerfile can be used to copy files from the host machine into the image.

• True
• False

Docker images are built in a linear fashion, with each instruction executed sequentially.

• True
• False