Hi John, Theoretically, this is a straightforward task but in reality CloudMan gets in the way of making it stick. Namely, if you are to manually remove the master instance from being an execution host, CloudMan will add it back in the next time a node is added or removed from the cluster, thus negating your manual modification. So, I will add this feature to CloudMan itself but I cannot commit to a date right now. It should be soon though. In the mean time, if you'd like to script this yourself via an add-hoc solution that runs periodically, below is the procedure for manually removing a node from SGE's execution host list: ubuntu@ip-10-204-170-63:~$ sudo -s root@ip-10-204-170-63:~# qhost HOSTNAME ARCH NCPU LOAD MEMTOT MEMUSE SWAPTO SWAPUS ------------------------------------------------------------------------------- global - - - - - - - ip-10-204-170-63 lx24-amd64 1 1.11 615.2M 161.6M 0.0 0.0 # Remove the host from the list of execution hosts root@ip-10-204-170-63:~# qconf -de ip-10-204-170-63 Host object "ip-10-204-170-63" is still referenced in cluster queue "all.q". # Edit the configuration of allhosts and remove the host in question. If this is the only host in the list, replace it's name with word NONE root@ip-10-204-170-63:~# qconf -mhgrp "@allhosts" root@ip-10-204-170-63.ec2.internal modified "@allhosts" in host group list # Show configuraiton of group allhosts root@ip-10-204-170-63:~# qconf -shgrp "@allhosts" group_name @allhosts hostlist NONE # The hos is now removed from the list of execution hosts root@ip-10-204-170-63:~# qstat -f root@ip-10-204-170-63:~# On Wed, Mar 7, 2012 at 6:23 AM, John Major <john.e.major.jr@gmail.com> wrote:

Hello All-

I'd like to launch a galaxy-cloudman head node which does not accept SGE jobs, but as jobs are submitted go to compute nodes (or cause compute node to be added when auto-scale is on). Primarily, this is b/c I'd like to have the head node be a cheaper instance which can run long term, and only fire up more expensive compute nodes as they are actually needed.

How would I enable this?

Thanks- John

___________________________________________________________ The Galaxy User list should be used for the discussion of Galaxy analysis and other features on the public server at usegalaxy.org.  Please keep all replies on the list by using "reply all" in your mail client.  For discussion of local Galaxy instances and the Galaxy source code, please use the Galaxy Development list:

 http://lists.bx.psu.edu/listinfo/galaxy-dev

To manage your subscriptions to this and other Galaxy lists, please use the interface at:

 http://lists.bx.psu.edu/