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.
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
List running docker processes:
List all processes that were ever run:
docker ps -a
List only the container IDs:
docker ps -a -q
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
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
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
Published at DZone with permission of Akshay Rangnekar, DZone MVB. See the original article here.
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