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How to RUN YOUR OWN Selenium-Grid

What is Selenium-Grid?

Selenium-Grid allows you run your tests on different machines against different browsers in parallel. That is, running multiple tests at the same time against different machines running different browsers and operating systems. Essentially, Selenium-Grid support distributed test execution. It allows for running your tests in a distributed test execution environment.
How Selenium-Grid Works–With a Hub and Nodes

A grid consists of a single hub, and one or more nodes. Both are started using the selenium-server.jar executable. We’ve listed some examples in the following sections of this chapter.

The hub receives a test to be executed along with information on which browser and ‘platform’ (i.e. WINDOWS, LINUX, etc) where the test should be run. It ‘knows’ the configuration of each node that has been ‘registered’ to the hub. Using this information it selects an available node that has the requested browser-platform combination. Once a node has been selected, Selenium commands initiated by the test are sent to the hub, which passes them to the node assigned to that test. The node runs the browser, and executes the Selenium commands within that browser against the application under test.

RUN YOUR OWN Selenium-Grid

java -jar selenium-server-standalone-2.53.0.jar -role node -hub http://localhost:4444/grid/register
sudo java -jar selenium-server-standalone-2.53.0.jar -role hub