Low Carbon ICT Services

Kang TangKang.tang@oerc.ox.ac.ukOxford e-Research Centre

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/

Kang.tang@oerc.ox.ac.uk