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Docker Command Cheatsheet

DZone's Guide to

Docker Command Cheatsheet

If you're new to Docker or just want to have a list of handy commands, this cheatsheet will help you install, monitor, maintain, and clean up your images and processes.

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I completed the course on “Docker Quickstart” at LinuxAcademy recently. Throughout the course, I made some notes on the important commands I found myself using over and over again. If you are new to Docker, here are my notes on getting started with the tool.

Installing Docker

All commands as root on CentOs7:

cd /etc/yum.repos.d
vim docker.repo


[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.com/repos/main/centos/7/
enabled=true
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg

yum install docker-engin

systemctl enable docker
systemctl start docker

usermod -a -G docker <username>
cat /etc/group | grep docker #should use the <username> as the group for the docker program


Docker Commands

List images:

docker images


List running docker processes:

docker ps


List all processes that were ever run:

docker ps -a


List only the container IDs:

docker ps -a -q


Running processes:

docker run <image>
docker run -d <image> = run in disconnected / daemon mode
docker run --name="Some Name" = name the running instance
docker start <name> = will restart a closed / exited instance of the image
docker exec -it <name> <command> = run a command within a running container without changing the state of the running container
docker stop <name> = stop a running container by using the name


Cleaning up Docker:

docker rm containerid = removes an instance of the container that was run
docker rm `docker ps -a -q` = remove all stopped containers
docker rmi image-name = removes the docker image and its dependencies


Redirect port:

docker run -P = will redirect the container's port to a random port on the host machine's user port (port no 32,000+)
docker run -p 8080:80 = will redirect the container's port 80 to a port 8080 on the host machine's user port 
docker port <container-name> = will list the port mapping information


Adding volume:

using the "-v" option mounts the local file system. eg to mount for an nginx on centos
-v /home/user/www:/usr/share/nginx/html


Building a Docker file:

docker login --username=<username>
Enter password

docker push username/repo


Linkerd, the open source service mesh for cloud native applications. Get the complete guide to using Linkerd and Kubernetes to build scalable, resilient applications.

Topics:
docker containers ,cloud ,docker commands ,tutorial

Published at DZone with permission of Akshay Rangnekar, DZone MVB. See the original article here.

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