RFE: openstack network load balancing

[simzacks]

In OpenStack, we have multiple networks defined, each with its own range of IP addresses. However, often a single network becomes overloaded. We would like to be able to list multiple valid networks and have linchpin check which of those networks has the lowest usage and use that one for all the provisioning in the pinfile.

[samvarankashyap]

@simzacks
It looks like an interesting feature to implement.
Do you happen to have a script that does the above actions when given parameters? or any library which does that?
It would be helpful if you could point us to resources that are useful for the implementation.

[simzacks]

A similar feature is being implemented in the OpenStack Cloud Plugin:
jenkinsci/openstack-cloud-plugin#279

That might be a good place to start. I've heard of another script in an older provisioner, but no one I spoke to knows what I'm talking about.

[olivergondza]

The java implementation in the PR @simzacks has mention might not serve the didactic purposes very well. Let me try to define what is desired:

• User would like to specify not only which networks to connect to (which I presume is currently implemented), but even that particular NIC is supposed to be in one of the number of networks, but it does not matter which one. The user wish the network to be auto-selected based on the number of free fixed IP to increase the likelihood the provisioning will not be botched because of running out of IPs.

• Implementation wise, there is an API endpoint to consult that reports the utilization of fixed IPs to base the decision on.