Recently I had to configure a Selenium Grid but could not find something really running on the WEB. So a decided to do it myself and post here something that really works.
The job is divided in two parts:
1) Configure the HUB
2) Configure each one of the nodes.
Configuring the HUB
Create a Json file and name it Config1.json
To start the hub, run this in the windows command line (CMD)
java -jar c:\grid\selenium-server-standalone-3.7.1.jar -role hub -hubConfig c:\grid\hubConfig1.json
Configuring a NODE
For each node, also have a Json file, like this one: