Please note: This documentation is for OSG 1.2. While we still provide critical security updates for OSG Software 1.2, we recommend you use OSG Software 3 for any new or updated installations. We are considering May 31, 2013 as possible OSG 1.2 End of Life (EOL).
Prepare the Compute Element Installation
About this Document
This document is for system administrators. It contains requirements that must be met and procedures completed before beginning the Compute Element Installation
Before you Begin
- Read the Site Planning Guide and plan your site on paper.
- Verify that the Operating System you are using is supported.
- Verify the operation of your local batch system.
- Read the Pacman notes for installation and best practices.
- Decide if your site will join the Production Grid or the Trash/Integration Testbed of the OSG.
- Know your CE's resource name and resouce group. These are values that you filled out when you registered the site in OIM.
- Determine your site sponsors. These are the Virtual Organizations that own the computing resources behind the CE.
Operating System and Networking Requirements
- a working network connection
- a fully qualified domain name for the gatekeeper
- a working forward and reverse DNS lookup for the IP address of the gatekeeper
- a valid host and several service certificates issued for the fully qualified domain name of the gatekeeper
- synchronized clocks using NTP for all resources constituting the Compute Element
- outbound network connections, please review the Firewall Document
Required Service Accounts
Required User Accounts
Unix user accounts need to be created for each Virtual Organization
of the account can be locally determined. You will be asked to provide a mapping from local accounts to VOs later during the configuration process. Since VO's are frequently added to the OSG, you should access the current list of registered VO's at MyOSG's Virtual Organization menu item
. Any new VO's will also appear in on the CE in the file
Required Host and Service Certificates
The following table lists OSG services that require a service certificate for their operation. Please request and install
the certificates before you proceed with the installation.
|| Default Location
| owned by the
| owned by the
| owned by the
|| owned by the
Do you have a Grid User Certificate?
As the system administrator you are required to test the functionality provided by the Compute Element. This requires a grid user certificate
issued for you.
: Yes, especially for new sysadmins.
: Most site admins install OSG compute element services as root. Paraphrasing from the VDT site
, if you install as root the VDT's programs can be made available to all the users on your system. Additionally, the VDT will be able to configure and start some of the grid services you might be installing. Some services can only be run if you are root. Corollary:
If you don't install as root, you cannot do these things. Unless your local policy states otherwise, you will want to install the OSG compute element as root.