[openstack-dev] [heat] Autoscaling event invocation

Chris Alfonso calfonso at redhat.com
Thu Aug 15 18:02:13 UTC 2013


Hello,

I would like to utilize Heat's autoscaling feature, but probably in a way it
was not initially designed to be used.

In summary what I would like to do is from within OpenShift monitor host
system capacity and when necessary invoke the scale up or down event.  The
trick here is I can't just let Heat create a host configured exactly like the
previous host that Heat created for OpenShift.  I need to be able to provide
parameters to the scaling event invocation so that when the host comes online
the OpenShift infrastructure knows what to do with the host. The parameters
to provide might vary depending on the design approach in Heat's autoscaling.
I should be able either specify a template to be used that outlines how to
set up the host OR I should be able to pass in user data that can be passed
into the template that was used initially when setting up the scaling group.

I've outlined the desired functionality in more detail here (the autoscaling
portion):
https://github.com/openshift/openshift-pep/blob/master/openshift-pep-007.md

I would like to start the discusion with the Heat group here on how best to
proceed with Heat's autoscaling and understand how the feature is evolving.

Thanks,
- Chris 
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