Docker

Why Docker - container image

• independent packages
  • avoid version conflicts

• namespace isolation

  • network isolation, own IP address and no need to worry about port conflicts

• docker hub, public

  • where do you put

Dockerfile

• FROM define the base image
  • if we use the same base image, docker will only pull once
  • alpine is the default base image
• MAINTEAINER
• ADD take a file/directory from the host machine and adds them to the file system of the container at specified location
• ENTRYPOINT let the docker container run as executable

Commands

• docker build - build an image
• docker run - create container
• docker ps - see running containers
• docker tag and docker login then docker push

Build

• create docker file
  • get the base image
  • get the dependencies (python, make, git...)
  • create app dir
  • copy package.json
  • run npm install
  • bundle your app's source code inside the Docker image, use the COPY instruction:
  • expose port
  • run commands

Run

docker run -p 49160:8080 -d <your username>/node-web-app

Push

#Create a new image from a container change
#docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]
docker commit CONTAINER_ID xunrongli/demo-dra:v1

#Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
#docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]
docker tag demo-dra xunrongli/demo-dra
docker push xunrongli/demo-dra