Simple Clock process as Docker container to prevent idling for free dyno on Heroku

clock.js

const http = require('http');

const ACCESS_URL = 'http://my-herokuapp.herokuapp.com';
const INTERVAL_MSEC = 10 * 60 * 1000; // every 10 minutes

setInterval(() => {
  http
    .get(ACCESS_URL, res => {
      console.log(res.statusCode, res.statusMessage, ACCESS_URL);
    })
    .on('error', err => {
      console.log(err, ACCESS_URL);
    });
}, INTERVAL_MSEC);

Dockerfile.clock

FROM node:9.11.1-alpine

LABEL maintainer="Keid"

RUN mkdir /app
WORKDIR /app

COPY clock.js clock.js

CMD node clock.js