Docker is free software developed by Docker Inc. The time after its release it became a must in the field of IT development. It allows users to create independent and isolated environments.
It is very helpful in launching and deploying any applications easily. These deployed applications are available to us in form containers.
Containers give isolated environments from one another and bundle their own software, libraries, and configuration files. They can communicate with each other through well-defined channels. They use fewer resources than virtual machines because they share the services of a single Operating System. Hence, docker enables developers to easily pack, ship, and run any application as a lightweight, portable, self-sufficient container, which can run virtually anywhere.
Let’s get started with some very often used commands.
Docker Registries and Repositories
The Registry is a stateless, highly scalable server-side application that stores and lets you distribute Docker images. The Registry is open-source, under the permissive Apache license. A registry is a storage and content delivery system, holding named images, available in different tagged versions.
Login to Registry
docker login [OPTIONS] [SERVER]
// login to self-hosted repository
docker login localhost:8080Logout from Registry
docker logout [SERVER] docker logout localhost:8080
Pulling an Image
docker pull [OPTIONS] NAME[:TAG|@DIGEST]
docker pull fedora
docker pull knoldusregistory.localhost:5000/myadmin/testimagePushing an Image
docker push knoldusrepository/nginx
docker push knoldusrepository/nginx localhost:5000/myadmin/nginxSearching an Image
docker search [OPTIONS] TERM
docker search nginx
docker search --filter=stars=3 --no-trunc busyboxPlay with Containers in Docker
Creating a Container
docker create [OPTIONS] IMAGE [COMMAND] [ARG...]
docker create -t -i knoldusregistry/coolcontainers --name coolcontainersRunning a Container
docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
docker run -it --name coolcontainers -d knoldusregistry/coolcontainersRenaming a Container
docker rename CONTAINER NEW_NAME
docker rename coolcontainers awesomecontainersUpdating a Container
docker update [OPTIONS] CONTAINER [CONTAINER...]
docker update --cpu-shares 512 -m 300M coolcontainersRemoving a Container
docker rm [OPTIONS] CONTAINER [CONTAINER...]
docker rm --force fedoraStarting a Container
docker start [OPTIONS] CONTAINER [CONTAINER...]
docker start nginxStopping a Container
docker stop [OPTIONS] CONTAINER [CONTAINER...]
docker stop nginxRestarting a Container
docker restart nginxPausing a Container
docker pause nginxUnpausing a Container
docker unpause nginxBlocking a Container
docker wait nginxSending a SIGKILL
docker kill nginxConnecting to an existing Container
docker attach [OPTIONS] CONTAINER
docker attach nginxGetting information about Containers
Getting Information About the Containers in Docker
Running Containers
docker ps
docker ps -aContainers Logs
docker logs coolcontainers
Inspecting containers
docker inspect coolcontainers
docker inspect --format '{{ .NetworkSettings.IPAddress }}' $(docker ps -q)
Containers Events
docker events coolcontainersPublic Ports
docker port coolcontainersRunning Processes
docker top coolcontainersContainer Resource Usage
docker stats coolcontainersPlaying with Images in Docker
Listing Images
docker imagesBuilding Images
docker build [OPTIONS] PATH | URL | -
docker build .
docker build github.com/creack/docker-firefox
docker build - < Dockerfile
docker build - < context.tar.gz
docker build -t knoldusregistry/coolcontainer .
docker build -f myDockerfile .
curl example.com/remote/Dockerfile | docker build -f - .
Removing an Image
docker rmi nginxShowing History of an Image
docker history
Creating an Image from a Container
docker commit nginxTagging an Image
docker tag nginx knoldusregistry/nginx
Pushing an Image
docker push knoldusregistry/nginx
You can download the cheat sheet from here. For more such blogs keep following knoldus blogs. If you liked this post, please recommend it and share it with your followers.Have fun! Happy learning!
