Common Commands

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Distribution Commands

  • pdsh -R ssh -a <command> 
 will ssh to all machines in /etc/pdsh-machines
  • pdsh -R ssh -g compute -X down <command> 
 ssh into all non-down compute nodes
  • pdsh -R ssh -g compute,test -X down -x r2a-s21,r2a-s22 <command> 
 will ssh to the groups (-g) compute,test excluding the group (-X) down group, and excluding the machine (-x) r2a-s21
 pdsh uses the /etc/netgroup file for group management
  • for i in `pbsnodes | grep ^[a-z]`; do ssh -x $i <command>; done 
 will ssh to each of the nodes that torque considers to exist and execute the command on them

Copy Commands

  • rsync -av --delete <original> <destination>

One Liners

  • How many procs are in the cluster, according to torque? 
for i in `pbsnodes | grep np | awk '{print $3}'`; do sum=$((sum + $i)); done; echo $sum; sum=0
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