GLExec

Multi User Pilot Job with CE & WN

gLExec is a program that acts as a light-weight 'gatekeeper'. gLExec takes Grid credentials as input. gLExec takes the local site policy into account to authenticate and authorize the credentials. gLExec will switch to a new execution sandbox and execute the given command as the switched identity. gLExec is also capable of functioning as a light-weight control point which offers a binary yes/no result called the logging-only mode.

Current gLExec version

The latest stable versions released are:

• gLite: 0.8.1
• EMI: 0.8.10

Latest version available: 0.9.3, to be released in EMI-2 and OSG.

User information

• Proxy file handling in gLExec What do all the environment variables do with proxy files
• GLExec TransientPilotJobs describes how you may go about managing a target workload's directory in Pilot Job Frameworks.
• GLExec Environment Wrap and Unwrap scripts describes how you can preserve the environment variables between the calling process of gLExec and the user switched side of gLExec. For example: to preserve the environment variables from a Pilot Job Framework, through gLExec and into Pilot Job Payload.

Documentation

• Exit codes of gLExec
• Man pages of gLExec

Sysadmin information

Deployment: Installation and setups

• gLExec on the Worker Nodes or Computing Element
  • Using generic per-node pool accounts or a shared map database
  • Using gLExec with Argus
  • Using the SCAS
  • Batch System Interoperability
  • LCMAPS Tracking GroupID plugin
• Deployment Scenarios in EGEE and OSG
• Secure installation considerations
• Debugging hints

• To help you master gLExec's security:
  • Need to Know's: Explains about the LD_LIBRARY_PATH in combo with setuid programs.
  • Argus and SCAS node dd. June 2nd, 2010: quick guide on how to decide for either SCAS or Argus as the central service with gLExec.

• FAQs and misconceptions about gLExec

See also the Background information

To help you adapt or rebuild gLExec

• Building gLExec and its gLite dependencies from SVN source How to build gLExec and all its gLite dependencies directly from source.
• Building gLExec from src rpm How to build gLExec from a source RPM.

Documentation

• Man pages of gLExec
• Service Reference Card for gLExec
• Papers about gLExec

See also the Background information

Test plans/reports

• EMI-1 gLExec release test report: This is the report describing the test performed for the software certification of the released components with gLExec.
• EMI-2 gLExec release test report: This is the report describing the test performed for the software certification of the released components with gLExec.

Background information

• Deployment of gLExec on the Worker Node
• Multi User Pilot Jobs