docker pull nginx # Pulls an image from docker hub
docker run node # Runs a container containing image
docker ps -a # shows all containers(processes) (running and exited)
docker ps # shows only running processes
docker run -it node # expose an iteractive session from inside the container to host machine
docker build . # builds an image based on specified path
docker stop container_name/id
docker run -p 3000:80 container_name # publish localhost:container_expose_port

docker start container_name # running existing containers -- we're not able to interact with it from local machine but it's started and running
# start runs container in background and run in foreground
# run has attach mode as default and start has detached mode as default
docker start -a container_name # start in attached mode/ run default

# run in detached mode
docker run -p 8000:80 -d container_id
docker attach container_name # attach to container again

docker logs container_name # show the log output in detached mode
docker logs -f container_name # keep on listening / attached mode again

docker ps -a
docker rm container_name1 container_name2 ....
docker images
docker rmi image_id1 image_id2 ....
docker image prune -a # removes all unused images by containers
docker run -p 3000:80 -d --rm container_name # remove the container when it stops
# Expose 80 should be same as the port nodeapp is running on

docker image inspect image_id

docker build -t rutwik/posts . # build an image based on cur-dir and tag it with name rutwik/posts
docker run rutwik/posts
docker run -it rutwik/posts sh # start a shell in dir instead running npm start
docker exec -it container_id sh # execute a given command in a running container
docker logs container_id # Print out logs from the given container

# REMOVE ALL CONTAINERS AND IMAGES AND DELETE VOLUMES
docker rm -vf $(docker ps -a -q)
docker rmi -f $(docker images -a -q)

docker cp folder_name/. name_of_container:/path_of_folder_to_copy
# . = everything, path_of_folder is created if it doesn't exist.
docker cp name_of_container:/path_of_folder_to_copy
# this command will copy from docker container to local dir

docker login
# create image repository on docker hub just like git.
# tag or create a new image locally based on the docker hub image name.
docker tag local:latest docker_hub/hello-world
docker push docker_hub/hello-world
# get image locally
docker pull image_name:tag

docker run -d -p 3000:80 --rm --name feedback-app feedback-node:volumes