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 version

The latest stable version is gLExec 0.7.0-2.

Deployment: Installation and setups

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

How To's and FAQ

• To help you master gLExec's security:
  • Need to Know's: Explains about the LD_LIBRARY_PATH in combo with setuid programs.
  • 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.
  • Building gLExec from src rpm How to build gLExec from a .src.rpm

• FAQs and misconceptions about gLExec

Documentation

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