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.

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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

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What we can't have

• virtualization
• special hardware
• dedicated machines

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General Idea

• let machines sleep
• awake machines listen if there are packets

meant for sleeping machines and wake them if necessary

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Ingredients

• Wake-on-LAN
• Ethernet port hijacking
• Distributed proxies

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Assumptions

• Subnet domains
• Availability over consistency
• Load-sensitive, unreliable machines

Key terms

• participant
• manager
• managee
• state
• proxy
• distributed management
• subnet state coordination
• apocalypse
• guardians

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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

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Improvements

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

The End

Thank you for your attention.