A sample YAML file to spin up Selenium Grid via docker-compose

docker-compose.yaml

# docker-compose file
# To execute this docker-compose yml file use docker-compose -f <file_name> up
# Add the "-d" flag at the end for deattached execution

#selenium-hub: equivalent to manually running the command docker run -d -p 4444:4444 --name selenium-hub  -P selenium/hub:3.6.0-bromine
selenium-hub:
  restart: always
  image: selenium/hub:3.6.0-bromine
  ports:
    - "4444:4444"
#selenium-chrome equivalent to manually running the command docker run -d --link selenium-hub:hub -P --name chrome selenium/node-chrome-debug:3.6.0-bromine
selenium-chrome:
  restart: always
  image: selenium/node-chrome-debug:3.6.0-bromine
  ports:
    - "5555:5900"
  volumes:
    - /dev/shm:/dev/shm
  links:
    - selenium-hub:hub
#selenium-firefox equivalent to manually running the command docker run -d --link selenium-hub:hub -P --name firefox selenium/node-firefox-debug:3.6.0-bromine
selenium-firefox:
  restart: always
  image: selenium/node-firefox-debug:3.6.0-bromine
  ports:
    - "5556:5900"
  volumes:
    - /dev/shm:/dev/shm
  links:
    - selenium-hub:hub