Get started with Docker

2020-05-30

I just tried out Docker for a small project and now I get all the hype around it. While searching for good guides I stumbled upon this excellent tutorial by Prakhar Srivastav: A Docker Tutorial for Beginners. If you want a deeper understanding of Docker and how it works, and not only how to spin up a container and leave it running, I highly recommend reading it. He also go through the basics of writing your own Docker image which helped me a lot.

Documentation

Install

pacman -Syu docker docker-compose
systemctl start docker
systemctl enable docker
docker info

Usage

Function	Command
Pull image	docker pull `image`
Remove image	docker image rm `image`
List images	docker image ls
Run container	docker run –name `container` `options` `image`
List containers	docker container ls
Stop container	docker container stop `container`
Remove container	docker container rm `container`
Remove inactive containers	docker container prune
Switch to container shell	docker exec -ti `container` /bin/sh
Exit container shell	exit
Build image	docker build –no-cache -t `username`/`image`:`tag` .
Delete stopped containers, networks, images and build cache	docker system prune -a
Delete dangling volumes	docker volume prune
Rename volume	docker volume create –name `new_volume` && docker run –rm -it -v `old_volume`:/from -v `new_volume`:/to alpine ash -c “cd /from ; cp -av . /to” && docker volume rm `old_volume`

Docker Compose update images

If you’re using Docker compose and want to update the images to the latest versions you can run the following when in the same directroy as docker-compose.yaml

docker-compose up --force-recreate --build -d
docker image prune -f