Docker cheat sheet

https://docs.docker.com/engine/reference/commandline/docker/

Basic Dockerfile for nodejs

# Real world use something like node:alpine for dat space saving
FROM node:10

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Bundle app source
COPY . .

EXPOSE 8080
CMD [ "node", "server.js" ]

Build image from dockerfile

docker build -t <your username>/node-web-app .
this generates an image with the -t tag supplied

Create running container from docker image

docker run -p 49160:8080 -d <your username>/node-web-app
The -p argument is the port, it maps from host port to docker port.
The -d argument stands for detached, runs the container in the background

Basic commands

docker images - list non intermediate images

docker ps (Process Status) - list all running containers

-a list all containers

docker system prune - removes non running and dangling images (which are images that are tagged and not referenced by any container).

Concepts

Image - Built file, used to run Containers
Container - running instance of an Image

Resources

Filesystem perf for mac - https://docs.docker.com/docker-for-mac/osxfs-caching/
Node Images - https://hub.docker.com/_/node/
Node best practices - https://github.com/nodejs/docker-node/blob/master/docs/BestPractices.md