Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 1 Grid Work in 2002 Andrew McNab High Energy Physics University of Manchester

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 2 Overview Globus packaging Testbed at Manchester Testbed Support for GridPP GridSite SlashGrid GACL / Authorization WG G-HTTPS Summary

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 3 Globus packaging for RH Linux Globus RPM’s were the first “public” Grid thing we started providing, back in spring Globus is the underlying software for most current Grid testbeds –including EDG + BaBar + SAM These became the basis of EDG releases in 2001 and we’ve provided updates during 2002 (currently at v24) This is becoming routine but still labour- intensive: so we’re handing over to NBI.dk, who already maintain a NorduGrid distribution.

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 4 Testbed at Manchester We’ve been involved with the EDG and GridPP testbeds since Dec 2001 –we were the first UK site to join the EDG testbed in fact Started with 4 machines, and has now grown to 16. Allows us to maintain production and development sites at the same time. Hands-on - “cheap and cheerful” approach. But gives experience for gridifying the farms

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 5 Testbed Support for GridPP This has come together a lot during –Now 3 other Support people as well as me (Bristol, IC and RAL) As well as website, now have: mailing list –fortnightly phone conferences –detailed site installation instructions Next phase will involve more support for other sites, especially ones without Grid experts. But at end of 2002 have a stable release, ready for experiments.

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 6 We started running a website for the UK HEP Grid in 2000 ( –When GridPP was formed, we changed to Initially provided software and support pages. Now used by most groups within GridPP to publish pages. –Using GridSite they manage pages themselves. Initially physically hosted in HEP group –now hosted on two machines in MC machine room, administered by us

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 7 GridSite: Grid/Web integration GridSite system has user authentification Maintains lists of users in different groups –Each directory has a list of groups who can modify its webpages (“Grid ACL”) –Group admins can modify group membership Website allows you to upload files, edit pages –Devolves the work of maintaining the site down to each subgroup Now used by GridPP, EDG Testbed website, UK e-Science Engineering Task Force and Level 2 Grid websites.

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 8 SlashGrid: Grid filesystems Almost all EDG sites use Manchester’s pool accounts system –get a temporary Unix UID when you run a job SlashGrid adds to this by controlling disk access and file ownership –Use Grid ACL’s to say who owns each directory –Enforced at kernel level so all programs see it Unix ID doesn’t matter: Grid ID does Also provides a remote filesystem using https –Like AFS, but Grid credentials and web servers

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 9 Grid Access Control Lists Our GACL format provides a way of writing ACLs using Grid credentials –user certificate names, group certificates etc GridSite/SlashGrid use this format already Other projects (eg EDG Storage Element) taking it up Now part of the authorisation work in Global Grid Forum (GGF) –GGF: world wide standards body for Grids –I co-chair the Authorisation Working Group

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 10 Extending HTTPS - G-HTTPS Normal HTTPS is already very Grid-like Work now underway to add more Grid features –need to avoid breaking existing HTTPS –our G-HTTPS proposal designed to do this Delegation from client to server –so get all the benefits discussed already Servers can return the ACL along with the file –so if I cache a copy locally, I know who I can share the copy with Relevant EDG groups involved; taking it to GGF

Andrew McNabGrid in 2002, Manchester HEP, 7 Jan 2003Slide 11 Summary Globus packaging work tailing off Manchester maintains presence in Testbeds We’re making a significant contribution to Testbed Support GridSite, SlashGrid and GACL “products” being taken up by EDG and others Security work feeding into new Grid-wide standards