Dont Lose Sleep Over Availability The GreenUp Decentralized Wakeup - PowerPoint PPT Presentation

Don’t Lose Sleep Over Availability The GreenUp Decentralized Wakeup Service Siddhartha Sen, Jacob R. Lorch, Richard Hughes, Carlos Garcia Jurado Suarez, Brian Zill, Weverton Cordeiro, and Jitendra Padhy Presentation: Kamil Yurtsever

Context ● We have many machines grouped in relatively small subnetworks. ● These are typical office machines. http://en.wikipedia.org/wiki/File:Computer-aj_aj_ashton_01.svg

Problem We want ● machines to be ○ available for remote access all the time ○ asleep as much as possible ● solution to be ○ easy to deploy ○ cheap ○ nonintrusive http://commons.wikimedia.org/wiki/File:USCurrency_Federal_Reserve.jpg

What we can't have ● virtualization ● special hardware ● dedicated machines http://commons.wikimedia.org/wiki/File:Stop.png

General Idea ● let machines sleep ● awake machines listen if there are packets meant for sleeping machines and wake them if necessary http://commons.wikimedia.org/wiki/File:2010-07-20_Black_windup_alarm_clock_face_SVG.svg

Ingredients ● Wake-on-LAN ● Ethernet port hijacking ● Distributed proxies http://en.wikipedia.org/wiki/File:Achiote_paste_ingredients.jpg

Assumptions ● Subnet domains ● Availability over consistency ● Load-sensitive, unreliable machines

Key terms ● participant ● manager ● managee ● state http://en.wikipedia.org/wiki/File:Crypto_key.svg ● proxy ● distributed management ● subnet state coordination ● apocalypse ● guardians

Distributed management ● Distributed probing ● Multiple management problem ● Manager duties

Subnet state coordination ● Periodic broadcast ● Rebroadcast by managers ● Roll call

Preventing apocalypse ● Non-independent sleep behavior ● Guardians http://commons.wikimedia.org/wiki/File:Asteroid_1.png

Improvements ● dynamic layer 2 routing ● handling encrypted traffic ● increasing availability ● choosing better guardians

The End Thank you for your attention.