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Add additional k8s controllers serially to cluster
I noticed when doing my Kubernetes cluster setup, that it would be common to see at least once that either controller 2 or 3 would fail to join the cluster as an additional control plane. The error present would say something like, "etcdserver: re-configuration failed due to not enough started members". It appears joining additional control planes concurrently is somewhat flaky in whether or not it would work. For now, my solution to this would be to join the additional control planes serially vs concurrently. For reference on a related GitHub issue with the same error seen: kubernetes/kubeadm#2001
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