[Openstack] Using heat template for defining floating IPs for instances created by Autoscaling::LaunchConfiguration

Steven Hardy shardy at redhat.com
Wed Sep 11 08:36:30 UTC 2013

On Wed, Sep 11, 2013 at 10:59:25AM +0300, Pekka Rinne wrote:
> hi all
> If I create AutoScalingGroup by using heat and define in template
> AWS::AutoScaling::AutoScalingGroup, AWS::AutoScaling::LaunchConfiguration,
> AWS::AutoScaling::ScalingPolicy and OS::Ceilometer::Alarms for up&down
> scaling - how is it intended that I can automatically associate Neutron
> Floating IPs to instances created this way? Is there already existing some
> mechanism that can handle this by using heat template?

The more common topology for this kind of deployment would be an
AutoScalingGroup behind a LoadBalancer resource, with an EIP associated
with the LoadBalancer.

> As in heat template it is not possible to define directly Neutron ports for
> e.g. LaunchConfiguration.

However, if your use-case demands it, I think this *should* be possible,
can you expand on why it is not?

Note that when defining the Neutron port, the ip_address is optional, and
if ommitted, Neutron will allocate the first available fixed IP from the
pool the instance:


> And then when up scaling happens the new instances would need to have
> floating IPs and ports as well. In down scaling network resources could be
> released.
> The only way I could think of is that I would run stack update or use
> horizon, but its not very practical with auto scaling.
> Or is there this kind of feature in road maps?

I think we need to better understand your use-case, associating an EIP with
every instance in a scaling group seems like a somewhat odd requirement,
but as outlined above, I don't think it's impossible if you really need it.


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