Running a container with docker run - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the docker run command do?

It creates and starts a new container from a specified Docker image.

beginner

How do you run a container in the background (detached mode)?

Use the -d option with docker run, like docker run -d image_name.

beginner

What option allows you to map a container port to a host port?

The -p option, for example docker run -p 8080:80 image_name maps host port 8080 to container port 80.

beginner

How can you give a container a custom name when running it?

Use the --name option, like docker run --name mycontainer image_name.

beginner

What happens if you run docker run without specifying a command?

Docker runs the default command defined in the image's CMD or ENTRYPOINT.

Which option runs a Docker container in detached mode?

A -p

B --name

C -d

D -it

The -d option runs the container in the background (detached mode).

How do you map port 5000 on your computer to port 80 in the container?

A docker run -p 5000:80 image

B docker run -p 80:5000 image

C docker run --port 5000:80 image

D docker run -port 80:5000 image

The syntax is -p hostPort:containerPort, so -p 5000:80 maps host port 5000 to container port 80.

What does docker run --name myapp image do?

A Names the image as myapp

B Names the container as myapp

C Runs the container with default name

D Deletes the container named myapp

The --name option assigns a custom name to the container.

If you want to interact with a container's terminal, which option should you add?

A -it

B -p

C -d

D --name

The -it option allows interactive terminal access to the container.

What is the default behavior if no command is given in docker run?

A Throws an error

B Container will not start

C Runs an interactive shell

D Runs the image's default command

Docker runs the default command specified in the image's configuration.

Explain how to run a Docker container in detached mode with a custom name and port mapping.

Think about options for background, naming, and ports.

Describe what happens when you run docker run without specifying a command or options.

Focus on Docker image defaults.