The recommended way of use is with docker containers.
Navigate to the Simple mode or Headless mode folder(steps are same):
cd Simple\ mode
Install the selenium hub with its nodes:
docker-compose up -d
NB To stop your grid:
docker-compose stop
# download selenium
wget https://selenium-release.storage.googleapis.com/3.141/selenium-server-standalone-3.141.5.jar
# set the Java CLASSPATH environment variable
export CLASSPATH=".:selenium-server-standalone-3.141.5.jar"
# compile the test code
javac MyTest.java
# launch
java MyTest
By default we setup a grid with 2 nodes. To setuo for example a grid with 2 Chrome nodes and 1 Mozilla node (the default one):
docker-compose up -d --scale chrome=2
More info: https://github.com/SeleniumHQ/docker-selenium/wiki/Getting-Started-with-Docker-Compose