Selenium 4 Grid Distributed Mode

Tutorial​​ 25​​ -​​ Selenium 4​​ Grid​​ Distributed​​ mode

Let us now see​​ how to setup​​ the​​ third​​ mode viz​​ Distributed​​ mode.

Go to the official download page​​ and download the latest stable version of Selenium server

https://www.selenium.dev/downloads/​​ 

​​ 

Download the latest stable chrome browser executable

Click documentation, you will be redirected to below page

https://chromedriver.chromium.org/​​ 

Click stable release link that you see above​​ 

Download the zip file and extract it.​​ 

Place the chromedriver jar in the same location where you have kept the selenium grid jar​​ 

Similarly, download the firefox executable

Open command prompt and cd to above location.​​ 

Let us now start the event-bus​​ by executing below command:

java –jar <jarfilename.jar>​​ event-bus

Copy the event-bus url and append /status at the end and launch it, notice that event bus is running

http://192.168.33.1:5557/status​​ 

Next,​​ let us​​ create session map (responsible​​ for mapping the session ids to the node the session is running on).

Open a new command window​​ java –jar <jarfilename.jar>​​ sessions

http://192.168.33.1:5556/status​​ 

Next, let us​​ create session​​ queue​​ (adds the new session request to​​ a local queue and the distributor picks up the request from the queue).

Open a new command window​​ and execute​​ java –jar​​ <jarfilename.jar> sessionqueue

http://192.168.33.1:5559/status​​ 

Next, we will create distributor (when selenium client code​​ sends a session creation request, then distributor is responsible for assigning a node. So we need to point distributor to sessions and session queue address).

Open a new command window and execute​​ java –jar <jarfilename.jar> distributor --sessions <session address> --sessionqueue <sessionqueue address> --bind-bus false

http://192.168.33.1:5553/status​​ 

Next,​​ create​​ a​​ router (router receives all client requests, the request to create a new session will be redirected to the distributor, thus router needs to point to sessions/sessionqueue/distributor).

Open a new terminal​​ java –jar <jarfilename.jar> router --sessions <session address> --sessionqueue <sessionqueue address> --distributor <distributor address>

Launch the router url​​ http://192.168.33.1:4444​​ 

Notice currently no nodes are registered

Next, we will register node to grid​​ hub.

Open another terminal and execute below command.​​ 

The​​ --detect-drivers true​​ will automatically detect the​​ firefox/chrome etc browsers in the same directory where selenium server jar is kept

java -jar selenium-server-4.1.1.jar node --detect-drivers true

Notice above that the node has been added.

Refresh the hub, notice below that we can now see the browsers

Let us now execute our script

Note:​​ If the script does not execute than stop and restart all the individual components​​ 

Below on firefox browser

So this is how we can execute our test in a​​ distributed​​ grid server.

Code snippets

package​​ sel4scripts;

import​​ java.net.MalformedURLException;

import​​ java.net.URL;

import​​ org.openqa.selenium.By;

import​​ org.openqa.selenium.Capabilities;

import​​ org.openqa.selenium.WebDriver;

import​​ org.openqa.selenium.chrome.ChromeOptions;

import​​ org.openqa.selenium.firefox.FirefoxOptions;

import​​ org.openqa.selenium.remote.RemoteWebDriver;

public​​ class​​ GridDistributedMode {

 public​​ static​​ void​​ main(String[]​​ args)​​ throws​​ MalformedURLException, InterruptedException {

  Capabilities​​ cap​​ =​​ new​​ FirefoxOptions();

  //Capabilities cap = new ChromeOptions();

  WebDriver​​ driver​​ =​​ new​​ RemoteWebDriver(new​​ URL("http://localhost:4444"),cap);

  driver.get("https://www.google.com/");

  driver.findElement(By.name("q")).sendKeys("Distributed grid…");

  Thread.sleep(3000);

 }

}

Thank you for reading!