On Jun 11, 2012, at 11:41 AM, Christian Parpart wrote: > Hi all, > > while I am still "somewhat" new to OpenStack, I was able to successfully > deploy a 6-node OpenStack setup > with 4 compute nodes, one controller node (yet to be HA'd) and one network > node (yet to be HA'd). > > However, now, that I am that far, I am in need to create a custom filter, due > to the companies requirements > on what VMs to put on what hardware. > Unfortunately, I am not yet that experienced in Python (know quite a few > others, so I shouldn't have > it that hard in getting into) and I - of course - don't know the Nova API as > well as you do. > > So I am looking for a complete basic Hello World Filter Scheduler example, > e.g. in form of a github repo, > that I can fork off, and improve it, and learn Nova by doing. > > I could not really find anything that helpful yet, and I think it might be a > wonderful entry-point for > quite a few of us. > > Is there anyone willing to help us here out a bit? > > Many many thanks, > Christian Parpart. > _______________________________________________
Christian: The admin docs have a chapter on scheduling that discusses the filter scheduler: http://docs.openstack.org/essex/openstack-compute/admin/content/ch_scheduling.html It's from a user's point, not a developer, but it does describe what all of the built-in filters do. You should be able to look at the corresponding code and see what they do pretty easily. Check out the nova/scheduler/filters directory which has the implementation of the existing filters: https://github.com/openstack/nova/tree/master/nova/scheduler/filters The simplest filter is the AllHostsFilter, which doesn't filter anything at all: https://github.com/openstack/nova/blob/master/nova/scheduler/filters/all_hosts_filter.py Take care, Lorin -- Lorin Hochstein Lead Architect - Cloud Services Nimbis Services, Inc. www.nimbisservices.com
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