Manage images
docker build
Create an image from a Dockerfile.
docker build [options] .
-t "app/container_name" # name
--build-arg APP_HOME=$APP_HOME # Set build-time variables
docker run
Deploys the container from docker image.
docker run [options] IMAGE
# see `docker create` for options
Example
Run a command in an image.
docker run -it debian:buster /bin/bash
Manage containers
docker Create
docker create [options] IMAGE
-a, --attach # attach stdout/err
-i, --interactive # attach stdin (interactive)
-t, --tty # pseudo-tty
--name NAME # name your image
-p, --publish 5000:5000 # port map (host:container)
--expose 5432 # expose a port to linked containers
-P, --publish-all # publish all ports
--link container:alias # linking
-v, --volume `pwd`:/app # mount (absolute paths needed)
-e, --env NAME=hello # env vars
Example
Create a container from an image.
$ docker create --name app_redis_1 \
--expose 6379 \
redis:3.0.2
docker Exec
Command to login to the container,
docker exec [options] CONTAINER COMMAND
-d, --detach # run in background
-i, --interactive # stdin
-t, --tty # interactive
Example
Run commands in a container.
docker exec app_web_1 tail logs/development.log
docker exec -t -i app_web_1 rails c
docker start/stop
Start/stop a container.
docker start [options] CONTAINER
-a, --attach # attach stdout/err
-i, --interactive # attach stdin
docker stop [options] CONTAINER
docker ps
Manage containers using ps/kill.
docker ps
docker ps -a
docker kill $ID
docker logs
See what's being logged in an container.
docker logs $ID
docker logs $ID 2>&1 | less
docker logs -f $ID # Follow log output
Images
docker images
Manages images.
$ docker images
REPOSITORY TAG ID
ubuntu 12.10 b750fe78269d
me/myapp latest 7b2431a8d968
docker images -a # also show intermediate
docker rmi
Deletes images.
docker rmi b750fe78269d
Clean up
Clean all
Cleans up dangling images, containers, volumes, and networks (ie, not associated with a container)
docker system prune
Additionally remove any stopped containers and all unused images (not just dangling images)
docker system prune -a
Containers
# Stop all running containers
docker stop $(docker ps -a -q)
# Delete stopped containers
docker container prune
Images
Delete all the images
docker image prune [-a]
Volumes
Delete all the volumes
docker volume prune
Sevices
To view list of all the services runnning in swarm
docker service ls
To see all running services
docker stack services stack_name
to see all services logs
docker service logs stack_name service_name
To scale services quickly across qualified node
docker service scale stack_name_service_name=replicas
Clean up
To clean or prune unused (dangling) images
docker image prune
To remove all images which are not in use containers , add - a
docker image prune -a
To prune your entire system
docker system prune
To leave swarm
docker swarm leave
To remove swarm ( deletes all volume data and database info)
docker stack rm stack_name
To kill all running containers
docker kill $(docekr ps -q )