Open Stack

On Thu, Jul 23, 2015 at 04:44:01PM +0200, Silvia Fichera wrote:
> Hi all,
> 
> I'm using OpenStack together with OpenDaylight to add a network awareness
> feature to the scheduler.
> I have 3 compute nodes (one of these is also the Openstack Controller)
> connected by a openvswitch controlled by OpenDaylight.
> What I would like to do is to write a filter to check if a link is up and
> then assign weight acconding to the available bw (I think I will collect
> this data by ODL and update an entry in a db).

So you would like to check if a link is up in compute nodes and order
compute nodes by BW, right ? I do not think you can use OpenDaylight
for something like that that will be too specific.

One solution could be to create a new monitor, they run on compute
nodes and are used to collect any kind of data.

  nova/compute/monitors

Then you may want to create a new "weight" to order hosts eligible by
data you have collected from the monitor.

  nova/scheduler/weights

> For each host I have a management interface (eth0) and an interface
> connected to the OVS switch to build the physical network (eth1).
> Have you got any suggestion to check the link status?
> I thought I can be inspired by the second script in this link
> http://stackoverflow.com/questions/17434079/python-check-to-see-if-host-is-connected-to-network
> to verify if the iface is up and then check the connectivity but It has to
> be run in the compute node and I don't know which IP address I could point
> at.
> 
> 
> Thank you
> 
> -- 
> Silvia Fichera

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