On Fri, Dec 05, 2014 at 04:13:49PM +0530, Deepthi Dharwar wrote: > Hi all, > > I have been using the autoscaling HOT template and have been successful > in running it. I do see number of VMs increasing and decreasing based on > my scaling metrics. However, I do have one extra requirement, i.e deploy > the VM on a different host. > > The scenario being, if I have a VM1 running on a particular host1 and > when comes a need to scale up based on the metrics, I want the new VM2 > to be deployed on a different host i.e host2. > > Scheduler does provide a filter i.e DifferentHostFilter, where one can > deploy an instance on a different host from a set of instances. However > to provide this as a part of scheduler hint in the HOT template, one > would need the UUID of previous spawned VM. Is there a way to get this > data via the HOT template and also pass it as different_host hint for > the new VM ?
If Nova forces you to specify a UUID of an existing VM when providing a scheduler hint, that means it is not a good interface IMO. Personally, I would prefer the Nova server-group APIs[1] on which have been quite some disbutes whether they belong to Nova. > So, if I have 2 hosts and have my webserver VM1 running on the host1, > ideally i would want VM2 webserver to be running on host2. > Is there an elegant way to achieve this ? I don't know an easy way to do this today though I can feel the need to support this in future. Basically, there are discrete policies that can be associated with a group of resources, i.e. creation-policy, scheduling-policy, termination-policy, availability-policy, ... to name a few. There is a work thread on improving this [2], but users have to be patient at the moment. Thanks, Qiming [1] http://developer.openstack.org/api-ref-compute-v2-ext.html#ext-os-server-groups [2] http://lists.openstack.org/pipermail/openstack-dev/2014-November/051764.html > Please help! > > Regards, > Deepthi _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : [email protected] Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
