Selenium Grid Configuration

Introduction#

Selenium Grid is a framework to run test distributed over a range of test devices. It’s used for testing web applications. Its possible to write tests in different popular programming languages, including C#, Groovy, Java, Perl, PHP, Python and Ruby. The tests can be run against a range of webbrowsers on platforms like Windows, Linux, and OS X.

It is open-source software, released under the Apache 2.0 license: web developers can download and use it without charge.

Syntax#

for to run the jar file the following is the syntax for every jar file
java -jar <jar-file-full-name>.jar -<your parameters if any>

Parameters#

Parameters	Details
role	Is what tells the selenium which it was `hub` or `node`
port	This is to specify which port the `hub` or `node` should be listening.
hub	This parameter is used in `node` to specify the hub url
browserName	Its been used in `node` to specify the browser name like firefox, chrome, internet explorer
maxInstances	Its where the instance of the browser is being specified eg. 5 means there will be 5 instance of the browser which user specified will be present.
nodeConfig	A Json configuration file for the node. You can specify the role, port etc. in here
hubConfig	A Json configuration file for the node. You can specify the role, port, max instances etc. in here

Java code for Selenium Grid

String hubUrl = "https://localhost:4444/wd/hub"       
DesiredCapabilities capability = DesiredCapabilities.firefox(); //or which browser you want
RemoteWebDriver driver = new RemoteWebDriver(hubUrl, capability);

Creating a Selenium Grid hub and node

Creating a hub

A quick configuration for a hub and node setup in selenium grid. For more information see: Grid 2 docs

Requirements

To set up a grid hub you need the flowing:

Selenium-server-standalone-.jar

Creating the hub

To Create a Hub you need to run the selenium server.

Download Selenium-server-standalone-.jar
Open your terminal and navigate to the folder where Selenium-server-standalone-.jar is
Execute the folowing command:
1. For default configuration java -jar selenium-server-standalone-<Version>.jar -role hub
2. For Json configuration java -jar selenium-server-standalone-<Version>.jar -role hub -hubConfig hubConfig.json
Open https://localhost:4444/ you will see a message a follows

On clicking console -> View config for to view the Configuration for the hub details.

Creating a Node

Requirements

To set up a grid hub you need the flowing:

Selenium-server-standalone-.jar
Webdrivers
Browsers
- Chrome
- FireFox
- Microsoft Edge (Windows 10)

Creating the Node

Now To create Nodes for the Hub

Download Selenium-server-standalone-.jar
Download the browsers you want to test in
Download the drivers for the browsers you want to test in
Open new terminal and navigate to the selenium server jar file location
Execute the folowing command:
1. for default configuration java -jar selenium-server-standalone-<VERSION NUMBER>.jar -role node
2. For Json configuration java -jar selenium-server-standalone-<Version>.jar -role node -nodeConfig nodeConfig.json
Now go to https://localhost:4444/grid/console to view the node details

Configuragtion via Json

An example configuration for a hub:

java -jar selenium-server-standalone-<version>.jar -role hub -hubConfig hubConfig.json

{
    "_comment" : "Configuration for Hub - hubConfig.json",
    "host": ip,
    "maxSessions": 5,
    "port": 4444,
    "cleanupCycle": 5000,
    "timeout": 300000,
    "newSessionWaitTimeout": -1,
    "servlets": [],
    "prioritizer": null,
    "capabilityMatcher": "org.openqa.grid.internal.utils.DefaultCapabilityMatcher",
    "throwOnCapabilityNotPresent": true,
    "nodePolling": 180000,
    "platform": "WINDOWS"
}

An example configuration for a node

java -jar selenium-server-standalone-<version>.jar -role node -nodeConfig nodeConfig.json

{
  "capabilities":
  [
    {
      "browserName": "opera",
      "platform": "WINDOWS",
      "maxInstances": 5,
      "seleniumProtocol": "WebDriver",
      "webdriver.opera.driver": "C:/Selenium/drivers/operadriver.exe",
      "binary":"C:/Program Files/Opera/44.0.2510.1159/opera.exe"
    },
    {
      "browserName": "chrome",
      "platform": "WINDOWS",
      "maxInstances": 5,
      "seleniumProtocol": "WebDriver",
      "webdriver.chrome.driver": "C:/Selenium/drivers/chromedriver.exe",
      "binary":"C:/Program Files/Google/Chrome/Application/chrome.exe"
    },
    {
      "browserName": "firefox",
      "platform": "WINDOWS",
      "maxInstances": 5,
      "seleniumProtocol": "WebDriver",
      "webdriver.gecko.driver": "C:/Selenium/drivers/geckodriver.exe",
      "binary":"C:/Program Files/Mozilla Firefox/firefox.exe"
    }
  ],
  "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
  "maxSession": 5,
  "port": 5555,
  "register": true,
  "registerCycle": 5000,
  "hub": "https://localhost:4444",
  "nodeStatusCheckTimeout": 5000,
  "nodePolling": 5000,
  "role": "node",
  "unregisterIfStillDownAfter": 60000,
  "downPollingLimit": 2,
  "debug": false,
  "servlets" : [],
  "withoutServlets": [],
  "custom": {}
}