osg roll: Users Guide: 
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The following are short examples of how to customize Condor using Rocks commands.
Enable Condor install on all VM-Containers Appliances: rocks add appliance attr vm-container OSG_Condor_Client true
Disable Condor install on particular node: rocks set host attr compute-0-0 OSG_Condor_Client false
Define a New Condor Master: rocks set attr OSG_Condor_Master central-master.my.edu
Enable MPI/Dedicated Scheduler: rocks set attr OSG_Condor_EnableMPI true.
Actively-running Condor daemons must be reconfigured for this attribute to take affect. This can be achieved dynamically on compute and frontend appliances using rocks sync host osg condor frontend compute.
Reinstalled nodes will build the correct configuration.