Docker Cheat Sheet

IMAGES

Docker images are a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.

Build an Image from a Dockerfile

docker build -t <image_name>

Build an Image from a Dockerfile without the cache

docker build -t <image_name> . (Note that there is a "." after it, don't forget to enter it.)

List local images

docker images

Delete an Image

docker rmi <image_name>

Remove all unused images

docker image prune

DOCKER HUB

Docker Hub is a service provided by Docker for finding and sharing container images with your team. Learn more and find images at https://hub.docker.com

Login into Docker

docker login -u <username>

Publish an image to Docker Hub

docker push <username>/<image_name>

Search Hub for an image

docker search <image_name>

Pull an image from a Docker Hub

docker pull <image_name>

GENERAL COMMANDS

Start the docker daemon

docker -d

Get help with Docker. Can also use –help on all subcommands

docker --help

Display system-wide information

docker info

CONTAINERS

A container is a runtime instance of a docker image. A container will always run the same, regardless of the infrastructure. Containers isolate software from its environment and ensure that it works uniformly despite differences for instance between development and staging.

Create and run a container from an image, with a custom name:

docker run --name <container_name> <image_name>

Run a container with and publish a container’s port(s) to the host.

docker run -p <host_port>:<container_port> <image_name>

Run a container in the background

docker run -d <image_name>

Start or stop an existing container:

docker start|stop <container_name> (or <container-id>)

Remove a stopped container:

docker rm <container_name>

Open a shell inside a running container:

docker exec -it <container_name> sh

Fetch and follow the logs of a container:

docker logs -f <container_name>

To inspect a running container:

docker inspect <container_name> (or <container_id>)

To list currently running containers:

docker ps

List all docker containers (running and stopped):

docker ps --all or docker ps -a

View resource usage stats

docker container stats