I also like the solution you found because it does not necessarily exclude the master from running jobs, just limits it. I'll see about adding that option as well.

On Tue, Mar 13, 2012 at 5:36 AM, John Major <john.e.major.jr@gmail.com> wrote:

Enis-

Thanks again for your advice. It led me on a small SGE learning dive and I actually settled upon a different solution that might be easier to configure and figured I'd share.

Using 'qconf -me IP'
I set:
'complex_variables slots=0' (or 1 if the head node was bigger).

This seemed to do the trick where the head node did not get overwhelmed and quickly added nodes if the jobs were not fast to execute. And seems to persist during auto scaling.

John

On Tue, Mar 6, 2012 at 4:00 PM, Enis Afgan <enis.afgan@irb.hr> wrote:

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
>

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