Docker for Developers

Rules of 12-factor-apps

You ship it - you run it
Monitoring is the new Testing
Don't repair - rebuild
Automate work processes
Test/Stage/Prod is always the same - create different versions
Be immutable - create different versions
Prefer a stateless (programming) model
Support SIGTERM for graceful shutdowns
Configuration via Environment-Vars
Scaling, Logging, Tracing isn't your business

12-Factor-Apps

Create and run small (Micro)services
Prefer Async I/O (Communication, Data-Access, etc.)
Prefer Stateless or use Data-Replication
Use Environment-Variables to configure application parameters
Using SIGTEM for graceful shutdowns
Using StdOut/StdErr to log output
Prefer using a Service-Discovery

Using the Docker-API with NodeJS

npm i dockerode --save

const Dockerode = require('dockerode');
const localDocker = new Dockerode('unix://var/run/docker.sock');

docker build -t docker-monitor .
docker run -v /var/run/docker.sock:/var/run/docker.sock --privileged docker-monitor

Examples

NodeJS 12-Factor-App Example