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Installing the Worker Node Client From RPMs

The OSG Worker Node Client is a collection of software components that is expected to be added to every worker node that can run OSG jobs. It provides a common environment and a minimal set of common tools that all OSG jobs can expect to use. Contents of the worker node client can be found here.

Note

It is possible to install the Worker Node Client software in a variety of ways, depending on your local site:

  • Install using RPMs and Yum (this guide) - useful when managing your worker nodes with a tool (e.g., Puppet, Chef) that can automate RPM installs
  • Use from OASIS - useful when worker nodes already mount CVMFS
  • Install using a tarball - useful when installing onto a shared filesystem for distribution to worker nodes

This document is intended to guide system administrators through the process of configuring a site to make the Worker Node Client software available from an RPM.

Before Starting

As with all OSG software installations, there are some one-time (per host) steps to prepare in advance:

Install the Worker Node Client

Install the Worker Node Client RPM:

root@host # yum install osg-wn-client

Services

Fetch-CRL is the only service required to support the WN Client.

Software Service name Notes
Fetch CRL EL8: fetch-crl.timer
EL7: fetch-crl-boot and fetch-crl-cron		 See CA documentation for more info

Note

fetch-crl-boot will begin fetching CRLS, which can take a few minutes and fail on transient errors. You can add configuration to ignore these transient errors in /etc/fetch-crl.conf:

noerrors

As a reminder, here are common service commands (all run as root):

To … Run the command …
Start a service service SERVICE-NAME start
Stop a service service SERVICE-NAME stop
Enable a service to start during boot chkconfig SERVICE-NAME on
Disable a service from starting during boot chkconfig SERVICE-NAME off

Validating the Worker Node Client

To verify functionality of the worker node client, you will need to submit a test job against your CE and verify the job's output.

  1. Submit a job that executes the env command (e.g. Run condor_ce_trace with the -d flag from your HTCondor CE)
  2. Verify that the value of OSG_GRID is set to /etc/osg/wn-client

How to get Help?

To get assistance please use this Help Procedure.

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