Docker images to setup the selenium grid

docker-compose.yml

version: '2'
services:
  hub:
    image: selenium/hub
    ports:
      - "4444:4444"

  firefox:
    image: selenium/node-firefox
    volumes:
      - /dev/urandom:/dev/random
    depends_on:
      - hub
    environment:
      - HUB_PORT_4444_TCP_ADDR=hub
      - HUB_PORT_4444_TCP_PORT=4444

  chrome:
    image: selenium/node-chrome
    volumes:
      - /dev/urandom:/dev/random
    depends_on:
      - hub
    environment:
      - HUB_PORT_4444_TCP_ADDR=hub
      - HUB_PORT_4444_TCP_PORT=4444