Stacked and external  etcd topologies

The data store operates in conjunction with other control plane components, sharing resources within the same control plane node

To ensure data store isolation from the control plane components, you can configure the bootstrapping process to use an external etcd topology. In this setup, the data store is provisioned on a dedicated host, reducing the risk of an etcd failure impacting other components.

References

1. LinuxFoundationX LFS158x. Chapter 4. Kubernetes Architecture