docker-guide.txt

docker run -ti image-name 'cmd to execute'

# list available images
docker image ls 

# list containers
docker ps -l # last stopped container
docker ps -a # all containers (run and stopped)

# Creating new images
Get the container name from 'NAMES' tag

docker commit container_name_tag new_image_name

docker run --rm # used for delete container when stopped
docker run -d # used to detach container, run in background and return to cmd terminal

docker attach container_name # used to go into the container again

# When inside container, run ctrl+p ctrl+q to exit the container and but keep it running in background

# Docker push to registry steps
# Create a username in hub.docker.com
# Create image repo in the user space

# login to docker hub user
docker login --username username
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

docker image ls
docker tag apigopgm:latest gsdockit/gsgoapi
docker push gsdockit/gsgoapi
###
# Once image uploaded to registry, we can directly use the command
docker run --rm gsdockit/gsgoapi:latest 

------

# Sharing system volume
docker run -ti -v "shared_path_from_loser:/shared_path_in_container" ubuntu bash

volumes-from option used to share data between containers as ephemeral and is deleted when no containers using it

---

It is possible to create multiple docker images in one dockerfile.
FROM ubuntu as builder
-- do something
FROM alpine
COPY --from=builder some-command

--
docker uses cgroups and namespaces

It can done using multiple FROM statement and --from=stage