Grid Computing at NERSC: OSG and Client Documentation

Table of Contents:

• Using OSG and Globus client software
• OSG Users
• Express Client Installation

Forms:

• NERSC Account Application Form for OSG users
• NERSC Computer Use Policy Form (required for ALL users)

Using OSG and Globus client software

On your workstation:
Download and install the OSG client software. Then run the following to setup your environment:

% . $INSTALL_DIR/setup.sh

% source $INSTALL_DIR/setup.csh

On PDSF:
Use the module command, to load the OSG environment:

% module load globus/OSG

% . /opt/OSG/setup.sh

% source /opt/OSG/setup.csh

Using modules on Jacquard, Bassi and DaVinci:
Use the module command to load the OSG or Globus toolkit. Where possible, you should use the default OSG module.
For Default OSG modules:

% module load osg

% module load osg/client

% module load osg/ce

% module load globus

OSG Users

OSG users should note that they will need to explicitly register with NERSC before they can run their jobs here. Access is on an individual user basis, rather than a per V.O. basis

Usage policies for OSG resources at NERSC.

• User must read and sign NERSC Computer Usage Policy, and return this to NERSC via mail or fax.
• Users will not be allowed to share an account - each account must map back to an individual user.*
• The user must have an allocation at NERSC through their VO.
• The user must have an account at NERSC and a valid Grid DN in the NIM database.

* This requirement may be reviewed in the future, to ensure continued OSG compatibility.

In order to run at NERSC, an OSG user must go through the following process.

1. If you already have a NERSC account, skip to step 5.
2. Apply for a NERSC account through the OSG new user form.
3. Read and sign the NERSC Computer Usage Policy form.
4. Mail or fax the above form to NERSC Account support.
5. Contact the person in charge of the group's activity at NERSC. By default, you will be associated with the OSG allocation and your P.I./P.I. Proxy will be Ruth Pordes, Miron Livny or Doug Olson.
6. If you belong to a VO supported by NERSC, contact the NERSC support staff and your PI to make sure that you are included in the appropriate files.
7. Once your account is ready, you will need to add your cert DN through the NIM interface

Express Install for basic NERSC Grid client

# Get pacman
wget http://physics.bu.edu/pacman/sample_cache/tarballs/pacman-3.26.tar.gz

# Install pacman
tar xzf pacman-3.26.tar.gz
cd pacman-3.26
source setup.sh
cd ..

# Create a directory for VDT
mkdir vdt
cd vdt

# Install VDT packages in NERSC grid client with pacman
pacman -get http://www.nersc.gov/nusers/services/Grid/pacman:nersc-grid-client

# 1. Answer 'y' for trusted cache questions
# 2. Answer 'y' if you agree to the licenses
# 3. Choice between local/no install for the certificates has been disabled, 
# so it doesn't matter any more - we will get the certs in the myproxy-logon 
# step. 

 
# Setup the environment (use setup.sh / setup.csh depending on your shell)
source setup.sh

# Get grid certificate, with trust roots
myproxy-logon -T -s nerscca.nersc.gov -l username

# Issue test grid commands
globus-url-copy file:///path/to/localfile gsiftp://davinci.nersc.gov//scratch/scratchdirs/username/remotefile
globus-job-run jacquardgrid.nersc.gov/jobmanager /bin/hostname