Useful docker commands

Some most used docker commands. On ubuntu, if docker install with snap, add /snap/bin/ to PATH

Most docker command should have two levels. But for comparability reason commands can be both top level command and command with sub commands.

e.g.

docker pull nginx should be docker image pull nginx in latest docker versions. I will use docker [image] pull to indicate the command can either be docker image pull or docker pull

Docker image vs container

From article How to Automate Docker Deployments An image is an inert, immutable, file that’s essentially a snapshot of a container. Images are created with the build command, and they’ll produce a container when started with run.

Useful commands

Command	Command description	Command example
docker [COMMAND] --help	man page for docker
docker version	version number
docker info	docker info (build, file system etc)
docker inspect NAME|ID	low-level information on Docker objects
docker search	Search a image by name	search nginx image docker search nginx
docker [image] pull	Pull a image by name	pull nginx image docker image pull nginx or to specific a version docker image pull nginx:stable-alpine or docker image pull nginx:1.16.1-alpine
docker [image] ls	list downloaded images
docker [image] rmi image-id	remove docker images
docker [image] rm container-id	remove docker images
docker [container] ls	equal to docker ps	COMMAND field indicate the current running process in the container -a display stopped container
docker network ls	list available networks	by default started container will be added to bridge(NAT) network
docker run IMAGE	run a docker image	IMAGE image name, e.g nginx, nginx:nginx:alpin if not available in local, will download –name [imagename] –rm [remove after stop] -it run in interactive mode and allocate a TTY -d detach mode, for demons
docker stop/start	stop/start a docker container	start can only used to start a stopped container -ai interactive
docker kill	send kill -9 to container(image name)and force it stop. container will be in exited status	docker stop will send 15
docker [container] rm	delete a container	container status need to be exited
docker exec	Run a command in a running container

Play around

docker run --name kvstore -d redis:6-alpine

docker ps
docker pause kvstore
docker unpause kvstore
docker container logs kvstore  #get logs

CONTAINER ID	IMAGE	COMMAND	CREATED	STATUS	PORTS	NAMES
633a89c3f23e	redis:6-alpine	“docker-entrypoint.s…”	5 seconds ago	Up 44 econds	6379/tcp	kvstore

login into the docker and run bin/sh

docker exec -it kvstore  /bin/sh
/data #

Docker cheat sheet

A good summary Docker Cheet Sheet

Base command

from latest cmd line reference Docker(base command)

Docker container life cycle

And this one: