Node and Docker

• bookmark this page, or drag this link http://github.com/undrewb/node-intro to your desktop. this will make it easy to return if you need to reboot.
• note that you could run the following steps on any platform with node and docker.
• for guidance on setting up a pi running rasbian to do this, please refer to pi-config.md
• After making any change to a file in visual studio code, press ctrl-s to save the change.

Initial project set up

Get started

In your terminal window, create a projects directory in which to work

cd
ls
mkdir projects
ls
cd projects
ls

Clone git repo

In your terminal window, setup git and get the project

git config --global user.email [email protected]
git config --global user.name "Your Name"
git clone https://github.com/undrewb/node-intro.git
ls

Get ready to go

In your terminal window, go to project folder

cd ~/projects/node-intro

Make sure node is installed

node -v
npm -v

Make sure docker is available

docker ps
docker images

Run visual studio code

code-oss .

Create node app

In visual studio code

• create and populate package.json

In terminal window

• download node dependencies.

  npm install
  

In visual studio code

• create and populate server.js

Lets make sure it all works. In terminal window

• start your application

  npm start 
  

In the web browser navigate to http://0.0.0.0:8080/

Create docker image

In visual studio code

• create and populate Dockerfile
• create and populate .dockerignore

In terminal window

• build docker image

  docker build -t pilab/node-intro-img .
  

• review docker images in local registry

  docker images
  docker ps
  

Run the docker image

In terminal window

• run the image with docker

  docker run -p 49160:8080 -d pilab/node-intro-img
  

• confirm its running

  docker ps
  

Basic docker commands

    docker build - create a docker image and put it in the local registry
    docker start - run a docker image from the local image
    docker ps - show the currently running containers
    docker stop - stop a running container.
    docker images - show the images in the local registry
    docker system prune - remove old container and images
    docker image rm <image id> - remove image from registry

Update source code

In visual studio code

• edit server.js

  res.send('Hello Hello\n');
  

In terminal window

• rebuild the container

  docker build -t pilab/node-intro-img .
  

• restart the container

  docker ps
  docker stop <name_of_container>
  docker run -p 49160:8080 -d pilab/node-intro-img
  curl http://localhost:49160
  

Troubleshooting

• reboot after installing docker so the docker daemon starts
• make sure you're in ~/projects/node-intro when you run the docker commands
• make sure you saved your changes after editting files.

References & Future work

https://nodejs.org/en/docs/guides/nodejs-docker-webapp/

https://nodesource.com/blog/8-protips-to-start-killing-it-when-dockerizing-node-js/

https://stackoverflow.com/questions/38362533/docker-reload-a-nodejs-app-with-nodemon

https://medium.com/lucjuggery/docker-in-development-with-nodemon-d500366e74df