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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. kubeadm config add support for more than one APIEndpoint **What this PR does / why we need it**: This PR completes the changes in kubeadm for management of more than one control plane instances introducing the possibility to configure more than one APIEndpoints **Which issue(s) this PR fixes** : refs https://github.com/kubernetes/kubeadm/issues/911, refs https://github.com/kubernetes/kubeadm/issues/963 **Special notes for your reviewer**: Depends on: - [x] https://github.com/kubernetes/kubernetes/pull/67830 **Release note**: ```release-note kubeadm: The kubeadm configuration now support definition of more than one control plane instances with their own APIEndpoint. The APIEndpoint for the "bootstrap" control plane instance should be defined using `InitConfiguration.APIEndpoint`, while the APIEndpoints for additional control plane instances should be added using `JoinConfiguration.APIEndpoint`. ``` /cc @kubernetes/sig-cluster-lifecycle-pr-reviews /sig cluster-lifecycle /area kubeadm /kind api-change /kind enhancement /assign @luxas /assign @timothysc /cc @chuckha @rosti @neolit123 @liztio