low carbon ict services kang tang [email protected] oxford e-research centre
TRANSCRIPT
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
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
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
WOL Central Server Interface
HUMAN
MACHINE CENTRAL SERVER
3rd PARTY SERVICESSOAP
HTTP REQ BROWSER
WS-SECURITY
KEBEROS
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
WOL Service in Oxford
RegistrationServer
Gateway
Gateway
Gateway
Central WOL Server
HFS Service
Gateway
Web
Auth
SSO
OUCS
WOL user interface
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
Monitoring service at Oxford
Gateway
Gateway
Gateway
MonitoringServer
Gateway
Web
Auth
SSO
Oak LDAP
Real-time subnet status chart
More Information
http://www.oucs.ox.ac.uk/wol/http://projects.oucs.ox.ac.uk/lowcarbonict/