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content/en/docs/setup/best-practices/certificates.md

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 title: PKI certificates and requirements
 reviewers:
 - sig-cluster-lifecycle
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 Kubernetes requires PKI certificates for authentication over TLS.
 If you install Kubernetes with [kubeadm](/docs/reference/setup-tools/kubeadm/kubeadm/), the certificates that your cluster requires are automatically generated.
 You can also generate your own certificates -- for example, to keep your private keys more secure by not storing them on the API server.
 This page explains the certificates that your cluster requires.
 
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 ## How certificates are used by your cluster
 
@@ -164,4 +164,4 @@ These files are used as follows:
 [kubeadm]: /docs/reference/setup-tools/kubeadm/kubeadm/
 [proxy]: /docs/tasks/access-kubernetes-api/configure-aggregation-layer/
 
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content/en/docs/setup/best-practices/multiple-zones.md

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 - quinton-hoole
 title: Running in multiple zones
 weight: 10
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 This page describes how to run a cluster in multiple zones.
 
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 ## Introduction
 
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 KUBERNETES_PROVIDER=aws KUBE_AWS_ZONE=us-west-2a kubernetes/cluster/kube-down.sh
 ```
 
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