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Distribute Control plane machines across user-defined failure domains.
This feature is being release under a TechPreviewNoUpgrade FeatureSet.
Failure domains can be defined in the `controlPlane` machine-pool of
`install-config.yaml` as follows:
```yaml
controlPlane:
name: master
platform:
openstack:
type: ${CONTROL_PLANE_FLAVOR}
failureDomains:
- computeAvailabilityZone: 'nova-1'
storageAvailabilityZone: 'cinder-1'
portTargets:
- id: storage
network:
id: 8db6a48e-375b-4caa-b20b-5b9a7218bfe6
- computeAvailabilityZone: 'nova-2'
storageAvailabilityZone: 'cinder-2'
portTargets:
- id: storage
network:
id: 39a7b82a-a8a4-45a4-ba5a-288569a6edd1
- computeAvailabilityZone: 'nova-3'
storageAvailabilityZone: 'cinder-3'
portTargets:
- id: storage
network:
id: 8e4b4e0d-3865-4a9b-a769-559270271242
```
Each `failureDomains` entry can take an optional
`computeAvailabilityZone` string, an optional `storageAvailabilityZone`
string, and an optional `portTargets` array.
Each `portTargets` entry requires an arbirtary `id`, which must be unique per
`failureDomain`. If `id` is exactly `control-plane`, then that
`portTarget` is used instead of the default primary subnet (or instead
of `machinesSubnet` if defined) as the first machine network.
Each `portTargets` entry takes an optional `network` object and an
optional `fixedIPs` array (not represented in the example).
The `network` object taks an optional `name` string and an optional `id`
string. `name` is ignored if `id` is passed.
Each `fixedIPs` entry takes a `subnet` object which syntax is [defined
in the `machinev1alpha1` spec as
`SubnetFilter`](d170fcdc0f/machine/v1alpha1/types_openstack.go (L230-L281)).
Note that unless an external load balancer is used, `portTargets` with
id `control-plane` must all have one single subnet and must all refer to
the same OpenStack subnet. As a consequence, the result will be similar
as setting a `machinesSubnet`, except that Compute nodes will not
follow.