WLCG Http Proxy Discovery Task Force

Contents of this page:

Mandate

• Define the WLCG-wide standards for grid jobs to find out what HTTP proxy or proxies to use

Rationale

• This problem has already been attempted to be solved in many different ways, none of them very completely, for example by CernVM, GlideinWMS, ATLAS site configurator, generator files for ATLAS & CMS, and now the Shoal tool for cloud proxies
• Having a standard would make it much easier for new applications to use local http proxy caches

Members

• Doug Benjamin (ATLAS, added March 2015)
• Barry Blumenfeld (CMS)
• Jakob Blomer (CERN-PH-SFT)
• Brian Bockelman (CMS, OSG)
• Dan Bradley (CMS)
• John DeStefano (ATLAS, OSG)
• Alastair Dewhurst (ATLAS)
• Dave Dykstra (CMS, OSG), Chair
• Ian Gable (ATLAS)
• Costin Grigoras (ALICE, added July 2014)
• John Hover (ATLAS, OSG)
• Stefan Roiser (LHCb)

All members can be contacted at wlcg-ops-coord-tf-httpproxydiscovery@cernNOSPAMPLEASE.ch

Task Overview

Task	Deadline	Progress	Affected VO	Affected Siites	Comment
Update CVMFS client to robustly support round-robin proxies	December 2014	100%	All	All	Tracked in JIRA ticket Implemented for cvmfs 2.1.20
Get critical mass of sites registered in GOCDB/OIM	February 2015	100%	All	All	Done
Implement squid monitoring based on GOCDB/OIM	November 2014	100%	All	All	Done by Alastair Dewhurst
Implement WPAD service wlcg-wpad.cern.ch/wpad.dat	September 2016	100%	All	All	Done by Dave Dykstra.

Meetings

• Notes from 24 April 2013 meeting

Presentations

• CHEP 2016 presentation describing the live WLCG WPAD service

References

• This topic was discussed some in the SquidMonitoringTaskForce before it was determined to make a separate task force, particularly in this configuration information system proposal and this WLCG operations coordination meeting presentation.
• Web Proxy Auto Discovery protocol
• Proxy Auto-Config file format
• pacparser library
• pacwget tool
• Frontier client retry strategy

Proposal

• Proposed standards for http proxy discovery