Docker

What is a Docker image?

•  A running instance of a Docker container

• A virtual machine template

• A snapshot of a Docker container

• A compressed archive containing an application and its dependencies

Which of the following options is not available for containers?

• build

•  update

• destroy

• create

Which option is used to map a port from the host to the container when running a Docker container?

• -e

• -v

• -p

• -i

What is the purpose of a Docker Volume?

• To store Docker images efficiently

• To create isolated networks for containers

• To manage container logs and outputs

• To persist data beyond the lifecycle of a container

Which Docker networking mode allows containers to communicate with each other on the same host?

• Bridge

• Host

• Overlay

• None

Which Dockerfile instructions admit Shell and Exec formats?

• RUN

• Only CMD

•  ENTRYPOINT and CMD

• All Dockerfile instructions admit both Exec and Shell formats

We executed a container named webserver. Which of the following sentences is false?

•  It can be removed using docker container rm --force

• We can update its image using docker container update

• We can rename the webserver container to websrv using docker container rename

• We can view the container's output using docker container logs

Which Docker networking mode enables containers to communicate across multiple Docker hosts?

• Bridge

• Host

• Overlay

• None

You have a Docker image built from a Dockerfile. You need to run a container from this image and pass environment variables to it during runtime. Which option should you use with the docker run command to achieve this?

• -e

•  -v

•  -p

•  -l

You have a Docker container running a web application that is accessible on port 8080. However, you want the application to be accessible on port 80 on the host system. How can you achieve this when running the container?

• Use the -p 80:8080 option with the docker run command.

• Use the -p 8080:80 option with the docker run command.

• Update the application's configuration to listen on port 80 inside the container

• Use the -P option with the docker run command.