low carbon ict services kang tang [email protected] oxford e-research centre
TRANSCRIPT
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Why computers are left switched ON?
• So they can be accessed remotely • For system update or backup • For use in distributed computing
experiments(Campus Grid)• For use as service provider• Careless or bad memory
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Wake on LAN (WOL)
• A technology that allow you to switch on a computer remotely• Originally from Intel & IBM in 1997• Supported by most modern hardware• Magic Packet: 6 bytes of ones +16xMAC• WOL over internet• Simple but useful
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Institutional WOL service overview
• Central server as single user front end• Gateway servers in local subnets • Identify node by physical address (MAC)• Integration with institutional SSO• Mandatory registration• Secured inter-server communication (HTTPS)• Integration with 3rd party services (WS)• Scalability and extensibility
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WOL Central Server Interface
HUMAN
MACHINE CENTRAL SERVER
3rd PARTY SERVICESSOAP
HTTP REQ BROWSER
WS-SECURITY
KEBEROS
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WOL Gateway
• Department only need to install gateway server
• Required for each subnet• Broadcast magic packets locally• Secured communications with central
server• Available as VMware appliance for both
Linux and windows• Low hardware requirement
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WOL Service in Oxford
RegistrationServer
Gateway
Gateway
Gateway
Central WOL Server
HFS Service
Gateway
Web
Auth
SSO
OUCS
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WOL user interface
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Monitoring Service• Motivation– Evaluate adoption of WoL– Better monitoring, better control– Make better use of existing
infrastructure• Share exactly same gateway as WoL • Can be turned on easily on gateway• Integration with SSO• Attributes based authorization• Privacy concern
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Monitoring service at Oxford
Gateway
Gateway
Gateway
MonitoringServer
Gateway
Web
Auth
SSO
Oak LDAP
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Real-time subnet status chart
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More Information
http://www.oucs.ox.ac.uk/wol/http://projects.oucs.ox.ac.uk/lowcarbonict/