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The LIGO Data Grid

The LIGO Data Grid (LDG) is a coordinated set of distributed computing centres operated by LIGO member groups as a subset of the IGWN Computing Grid. These computing centres share authentication infrastructure, among other things, to present a similar user experience across locations.

Member locations

Cluster Location
Hawk Cardiff, UK
IUCAA Pune, India
LDAS@CIT Pasadena, CA, USA
LDAS@LHO LIGO-Hanford, WA, USA
LDAS@LLO LIGO-Livingston, LA, USA
Nemo University of Wisconsin-Milwaukee, WI, USA

Request an account

To request an account on the LIGO Data Grid, please complete the form at

https://grouper.ligo.org/ldg

Access to computing centres

This page describes how to gain access to the IGWN shared computing centres.

Make sure you have an account

User accounts are not automatically created for all collaboration members on all computing centres, please see the specific instructions for the relevant computing centre (find a link in the left menu) to request an account.

Managing your LIGO Data Grid account

Users can manage their LIGO Data Grid account settings at

https://grouper.ligo.org/ldg/

including ssh keys (more information below), X.509 identities, and login shell.

Access to the LIGO Data Grid

LIGO.ORG account holders can access the LIGO Data Grid in a few different ways:

  1. Indirectly with ssh via ssh.ligo.org
  2. Directly with ssh directly using an SSH key
  3. Directly with gsissh

The ssh.ligo.org portal

The SSH portal ssh.ligo.org can be accessed using a LIGO.ORG username and password

ssh albert.einstein@ssh.ligo.org

Upon login, users will be presented with an interactive menu from which to choose the host to be connected to.

ssh.ligo.org login menu

::: LIGO Data Grid Login Menu :::

Select from these LDG sites:
 0. Logout
 1. AEI - Albert Einstein Institue, Hannover (Germany)
 2. CIT - California Institute of Technology, Pasadena, CA (USA)
 3. LHO - LIGO Hanford Observatory - Hanford, WA (USA)
 4. LLO - LIGO Livingston Observatory - Livingston, LA (USA)
 5. UWM - Center for Gravitation, Cosmology & Astrophysics (Milwaukee, WI, USA)
 6. IUCAA - Inter-University Centre for Astronomy & Astrophysics, Pune (India)
 7. CDF - Cardiff University, Cardiff (UK) [Registered Users Only]
 -------------------------------------------------------------
 Z. Specify alternative user account

Enter selection from the list above:

Direct SSH access with an SSH key

LIGO.ORG account holders can manage SSH keys for use in accessing the LIGO Data Grid at https://grouper.ligo.org/ldg/manage_ssh/.

Direct access with GSISSH

LIGO.ORG account holders can connect to LDG hosts using gsissh, an extensions of SSH that uses a pre-created credential.

Install the LDG-Client

In order to connect to the LDG clusters, the client tools that enable authentication (and authorisation) need to be installed. Installation instructions, for various supported platforms, can be found here.

With the LDG-Client software installed, users can create a personal X.509 grid proxy via:

ligo-proxy-init albert.einstein

Tip

Replace albert.einstein with your LIGO.ORG username.

and can then continue to access an LDG host using gsissh:

gsissh ldas-pcdev1.ligo.caltech.edu

Access to other computing centres

Work in progress

This section is incomplete, we welcome contributions to complete this.