moby--moby/docs/sources/userguide/level1.md

page_title: Docker Images Test page_description: How to work with Docker images. page_keywords: documentation, docs, the docker guide, docker guide, docker, docker platform, virtualization framework, docker.io, Docker images, Docker image, image management, Docker repos, Docker repositories, docker, docker tag, docker tags, Docker Hub, collaboration

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Dockerfile Tutorial

Test your Dockerfile knowledge - Level 1

Questions

What is the Dockerfile instruction to specify the base image ?

The right answer was FROM

What is the Dockerfile instruction to execute any commands on the current image and commit the results?

The right answer was RUN

What is the Dockerfile instruction to specify the maintainer of the Dockerfile?

The right answer was MAINTAINER

What is the character used to add comment in Dockerfiles?

The right answer was #

Congratulations, you made no mistake!
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And try the next challenge: Fill the Dockerfile

Your Dockerfile skills are not yet perfect, try to take the time to read this tutorial again.

You're almost there! Read carefully the sections corresponding to your errors, and take the test again!

Check your answers

Fill the Dockerfile

Your best friend Eric Bardin sent you a Dockerfile, but some parts were lost in the ocean. Can you find the missing parts?

# This is a Dockerfile to create an image with Memcached and Emacs installed. 

# VERSION       1.0

# use the ubuntu base image provided by dotCloud
 ub

 E B, eric.bardin@dotcloud.com

# make sure the package repository is up to date
 echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
 apt-get update

# install memcached
RUN apt-get install -y 

# install emacs
 apt-get install -y emacs23

Congratulations, you successfully restored Eric's Dockerfile! You are ready to containerize the world!.
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Wooops, there are one or more errors in the Dockerfile. Try again.

Check the Dockerfile

What's next?

In the next level, we will go into more detail about how to specify which command should be executed when the container starts, which user to use, and how expose a particular port.

Back Go to the next level