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Docker_notes.md

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Introduction

  • Image: includes everything needed to run an application - the code or binary, runtimes, dependencies, and any other filesystem objects required
  • Container: a running process, with some added encapsulation features applied to it in order to keep it isolated from the host and from other containers
  • Official documentation

Build image

Step 1: cd to project folder, new a Dockerfile

  • Dockerfile describes step-by-step recipe on how to build up your image
  • Example
# Use the official image as a parent image
FROM node:current-slim

# Set the working directory
WORKDIR /usr/src/app

# Copy the file from your host to your current location
COPY package.json .

# Run the command inside your image filesystem
RUN npm install

# Inform Docker that the container is listening on the specified port at runtime
EXPOSE 8080

# Run the specified command within the container.
CMD [ "npm", "start" ]

# Copy the rest of your app's source code from your host to your image filesystem
COPY . .

Step 2: build the image

docker build --tag hellodocker:1.0 .

Step 3: run the image

docker run --publish 88:80 --deatch --name hello_docker hellodocker:1.0

  • --publish maps host’s port 8000 to the container’s port 8080
  • --detach runs this container in the background
  • --name specifies a name with which you can refer to your container in subsequent commands

Other commands

  • Stop the running container: docker stop hello_docker
  • Remove the container: docker rm hello_docker
  • Remove the image: docker image rm hello_docker
  • List all images: docker image ls
  • Version: docker --version