The document discusses the management of a large Selenium Grid using lightweight virtual machines (VMs) on a host, emphasizing ease of control from a Linux shell and configurable settings. It highlights advantages such as quick restarts and stability over 1.5 years, while noting disadvantages like the need for some Linux experience and limited features compared to VMware. Additionally, it mentions proxy tunneling issues and provides links to resources for grid management enhancements.

1. Managing Large Selenium Grid
Dima Kovalenko (@dimacus)
Jack Calzaretta

3. http://seleniumcamp.com

9. VMs

12. www.xenproject.org

13. Open Source
• GNU License
• Free

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

17. Stable
• 1.5 years with 0 maintenance

18. Controls
• Complete control from linux shell

20. 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

21. Example Config

25. Network
• Bridge network
• Easy network setup

26. GUI Access
• VNC
• Each Windows instance listens on different
port

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

29. Proxy

30. Problem
• Many computers
• Many datacenters
• A lot of firewalls

36. Reverse tunnel
• SauceConnect

38. Reverse tunnel
• SauceConnect
• Slow

40. Reverse tunnel
• SauceConnect
• Slow
• Can be Unstable
• Machine to port nightmare

41. Proxy Tunnels

42. Browser Proxy Settings
• Set Browser to use 1 port
• Set white list of reachable assets

45. JVM
• -Dhttp.proxyHost=
• -Dhttp.proxyPort=
• Java -Dhttp.proxyHost=123 -
Dhttp.proxyPort=123 –jar selenium.jar –role
hub

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

48. Goal
• Stabilize OS in Grid
• Give control over grid nodes

50. Tie Into Hub
• DefaultProxy class
• Pre/After Session hook

52. Status Servlet
• Added new servlet for node status
• Json return

54. 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..

55. Help Us out
• Java
• Very friendly
• https://github.com/groupon/Selenium-Grid-
Extras

56. Thank you
• Dima Kovalenko
• @dimacus