Managing Large Selenium Grid

Managing Large Selenium Grid

Dima Kovalenko (@dimacus)Jack Calzaretta

http://seleniumcamp.com

VMs

www.xenproject.org

Open Source

• GNU License• Free

Fast

• Lightweight• Windows restarts in 5 seconds• 8 Windows 7 VMs on 1 host

Stable

• 1.5 years with 0 maintenance

Controls

• Complete control from linux shell

Controls

• Complete control from linux shell• Making new VMs by copy/paste• Windows info stored in text file• Can use any VCS to store configs

Example Config

Network

• Bridge network• Easy network setup

GUI Access

• VNC• Each Windows instance listens on different

port

Disadvantages

• Need some linux experience• No GUI• Does not have as many features as VMWare• A lot of initial work

Proxy

Problem

• Many computers• Many datacenters• A lot of firewalls

Reverse tunnel

• SauceConnect

Reverse tunnel

• SauceConnect• Slow

Reverse tunnel

• SauceConnect• Slow• Can be Unstable• Machine to port nightmare

Proxy Tunnels

Browser Proxy Settings

• Set Browser to use 1 port• Set white list of reachable assets

JVM

• -Dhttp.proxyHost=• -Dhttp.proxyPort=• Java -Dhttp.proxyHost=123 -

Dhttp.proxyPort=123 –jar selenium.jar –role hub

GridExtras

• https://github.com/groupon/Selenium-Grid-Extras

Goal

• Stabilize OS in Grid• Give control over grid nodes

Tie Into Hub

• DefaultProxy class• Pre/After Session hook

Status Servlet

• Added new servlet for node status• Json return

Features

• Turn on/off IE Protected mode• Update Webdriver• Update Chrome Driver• Update IEDriver• Kill Any Browser• Check any OS Port• Kill anything on a given port• Reboot OS• Take OS Screenshot• Etc..

Help Us out

• Java• Very friendly• https://github.com/groupon/Selenium-Grid-Ex

tras

Thank you

• Dima Kovalenko• @dimacus