3b787c9b3d
Automatic merge from submit-queue azure: filter load balancer backend nodes to PrimaryAvailabilitySet (if set) <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, read our contributor guidelines https://github.com/kubernetes/kubernetes/blob/master/CONTRIBUTING.md and developer guide https://github.com/kubernetes/kubernetes/blob/master/docs/devel/development.md 2. If you want *faster* PR reviews, read how: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/faster_reviews.md 3. Follow the instructions for writing a release note: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes --> **What this PR does / why we need it**: - Adds a new field (`PrimaryAvailabilitySetName`) to the Azure CloudProvider config struct - If the field is set, only machines who are in that availabilitySet are added to the load balancer backend pool. This is required to: - Support more than 100 nodes in Azure (only can have 100 nodes per availability set) - Support multiple availability sets per cluster (An Azure L4 LoadBalancer can only be pointed at nodes in a single availability set) Without this PR, or if the field is **not** set in a cluster that contains two availabilitysets, then the following is observed: - Azure resources are created (LB, LB rules, NSG rules, public IP) - Azure throws errors when trying to add nodes from the "other" availability set - The service winds up exposed to the outside world (if you manually retrieve the public ip from Azure API) - Kubernetes controller-manager's service loop keeps retrying forever because it never finishes fully successfully - The "external ip" property field is never updated. **Which issue this PR fixes**: Fixes #34293 **Unknowns**: - Naming convention: `LoadBalancedAvailabilitySet` might be more descriptive than `PrimaryAvailabilitySet`, but is also a misnomer since `kube-proxy` will still end up routing requests to all relevant nodes. - Is it worth trying to be "smart" about it in the case the user hasn't set this field in the config? Save the first availability set name and try not to add any nodes that aren't also in that one? It may simply be better to just let this fail so the user has to choose the right setting for their use-case. **Release note**: <!-- Steps to write your release note: 1. Use the release-note-* labels to set the release note state (if you have access) 2. Enter your extended release note in the below block; leaving it blank means using the PR title as the release note. If no release note is required, just write `NONE`. --> ```release-note azure: add PrimaryAvailabilitySet to config, only use nodes in that set in the loadbalancer pool ``` CC: @brendandburns, @anhowe
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