-* At least three _controller_ nodes that run the Kubernetes control plane are required for HA. This is because clusters use a quorum system, in which more than half the nodes must be up and reachable. In clusters with three controller nodes, the Kubernetes control plane can continue to operate if one node fails because a quorum can still be reached by the remaining two nodes. By default, with Embedded Cluster, all new nodes added to a cluster are controller nodes. For information about customizing the controller node role, see [roles](/reference/embedded-config#roles) in _Embedded Cluster Config_.
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