gwd.conf file

WRF4G Grid Resources are currently defined by ​GridWay Drivers. Therefore, if you want to access to Grid Resources, you must configure gwd.conf. This file is located under $WRF4G_LOCATION/opt/drm4g_gridway/etc directory.

WRF4G GridWay Drivers Available

The following drivers are included in WRF4G:

• Information Driver:
  • BDII (gw_im_mad_bdii)

• Transfer Driver:
  • Dummy Transfer driver (gw_tm_mad_dummy)

• Execution Drivers:
  • GRAM2 (gw_em_mad_gram2)
  • CREAM (gw_em_mad_cream)

Required Middleware

The following middlewares should be installed to use the corresponding drivers:

• Globus Toolkit 2 and above, and gLite 3.1 (GRAM2-based)
• UMD1 or UMD2 (CREAM-based)

Configuration options Divers

Next steps describe a specific configuration of drivers for Gisela Infrastructure. However, the examples below can be applied to another VO.

In file $WRF4G_LOCATION/opt/drm4g_gridway/etc/gwd.conf:

# Example MAD Configuration for GISELA
# GT2 
IM_MAD = gisela_gt2:gw_im_mad_bdii:-q (GlueCEAccessControlBaseRule=VO\:prod.vo.eu-eela.eu)(GlueCEImplementationName=LCG-CE)  -s bdii.eela.ufrj.br:tm_gt2:em_gt2
EM_MAD = em_gt2:gw_em_mad_gram2::rsl_nsh
TM_MAD = tm_gt2:gw_tm_mad_dummy:-u gsiftp\://ui01.macc.unican.es

# CREAM
IM_MAD = gisela_cream:gw_im_mad_bdii:-q (GlueCEAccessControlBaseRule=VO\:prod.vo.eu-eela.eu)(GlueCEImplementationName=CREAM)  -s bdii.eela.ufrj.br:tm_cream:em_cream
EM_MAD = em_cream:gw_em_mad_cream.py::jdl
TM_MAD = tm_cream:gw_tm_mad_dummy:-g

There are two options for the configuration of IM MAD:

• -q: it is possible to configure a GridWay instance to only use queues authorized to your VO by filtering them.
• -s: information server in a hierarchical configuration.

  IM_MAD = glisela_gt2:gw_im_mad_bdii:-q (GlueCEAccessControlBaseRule=VO\:prod.vo.eu-eela.eu)(GlueCEImplementationName=LCG-CE) -s bdii.eela.ufrj.br:tm_gt2:em_gt2
  

There are two options for the configuration of the TM MAD:

• -g: starts a ​ GASS server for each user.

  TM_MAD = tm_gt2:gw_tm_mad_dummy:-g
  

• -u: specifies the URL of a ​ GridFTP server running in the client. For example:

  TM_MAD = tm_gt2:gw_tm_mad_dummy:-u gsiftp\://ui01.macc.unican.es
  

For more information about MAD configuration see ​GridWay Configuration Guide

After modifying gwd.log, in order to make changes effective, you have to execute:

wrf4g_framework reload

Accessing the VOMS servers

In order to use the Grid Resources, users should iniatilize the proxy through voms server:

[user@ui~]$ voms-proxy-init --voms prod.vo.eu-eela.eu
Cannot find file or dir: /oceano/gmeteo/users/carlos/.glite/vomses
Enter GRID pass phrase:
Your identity: /DC=es/DC=irisgrid/O=unican/CN=josecarlos.blanco
Creating temporary proxy ........................................ Done
Contacting  voms.eela.ufrj.br:15003 [/C=BR/O=ICPEDU/O=UFF BrGrid CA/O=UFRJ/OU=IF/CN=host/voms.eela.ufrj.br] "prod.vo.eu-eela.eu" Done
Creating proxy ................................... Done
Your proxy is valid until Tue Aug 23 22:15:06 2011