A Docker Commands Quick Reference Cheat Sheet

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Optimizing the platform’s functionality begins with mastery of requisite Docker commands, especially those listed on this cheat sheet that address installation, Hub interaction, and container and image creation and use.

Installation

Docker Syntax Description
curl -sSL https://get.docker.com/ | sh The Docker maintained installation script
for Debian or Ubuntu.
sudo yum -y install docker The install command for Centos 7
or Fedora 21 and up.
sudo service docker start For Centos 7 and Fedora 21 after install,
Docker must be started.

Docker Hub

Docker Syntax Description
sudo docker search searchitem Search Docker Hub for images. Replace
searchitem with a search-able term.
sudo docker pull user/image Downloads an image from Docker Hub.
sudo docker push user/image Uploads an image to Docker Hub.
A Docker Hub username is necessary.

Use Containers and Images

Docker Syntax Description
sudo docker run -t -i user/image Runs an image, creating a container and
changing the command prompt
to within the container.
sudo docker run -p 80:3000 -t -i user/image Similar to the command above
but with port forwarding.
ctrl+p then ctrl+q From the container’s command prompt,
detach and return to the host’s prompt.
sudo docker attach 1aa Changes the command prompt
from the host to a running container.
Replace 1aa with a container ID.
sudo docker ps -a List all container instances, with their ID,
and status.
sudo docker images Lists all images on the local machine.
sudo docker rm -f 1aa Delete a container.
Replace 1aa with a container ID.
sudo docker commit 1aa user/image Save a container as an image.
Replace 1aa with a container ID.

Image Creation

Docker Syntax Description
FROM ubuntu:14.04
MAINTAINER Sample User
user.email@email.com
RUN apt-get update
Create an empty directory
with a file named Dockerfile,
then insert this syntax.
From the new directory,
run the build command,
listed below.
sudo docker build -t sampleuser/ubuntu . Builds a Docker image
from a Docker file,
as shown above.

This guide is published under a CC BY-ND 4.0 license.