Simplest way to start protractor in container (as far as i know). Comments are welcome!

docker-compose.yml

version: '2'
services:
  selenium-chrome-standalone:
    ports:
     - "44444:4444"
    image: "selenium/standalone-chrome"

  e2e-tests:
    build: .
    links:
     - selenium-chrome-standalone
    depends_on:
     - selenium-chrome-standalone

Dokerfile

FROM node:7
COPY . /e2e
WORKDIR /e2e
RUN npm install 
CMD npm test

protractor.conf.ts

import {Config} from 'protractor';

export let config: Config = {
    
    seleniumAddress: 'http://selenium-chrome-standalone:4444/wd/hub',
    
    // Other settings here...
};

Another option - is to use

entrypoint.sh
!#/bin/bash
exec npm $@

Dockerfile
...
...
COPY entrypoint.sh .
RUN chmod +x entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
docker-compose.yml
services:
    e2e:
        command:
          - test