On 12/08/2014 08:13 AM, Qiming Teng wrote: > 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.
Agree! > >> 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. > Thank you for the pointers. Regards, Deepthi > 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 > > > _______________________________________________ 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
