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1. Update *Kubernetes controller manager's* `-root-ca-file` to include both old and new CA and restart controller manager.
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1. Update {{< glossary_tooltip text="kube-controller-manager" term_id="kube-controller-manager" >}}'s `--root-ca-file` to
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include both old and new CA. Then restart the component.
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Any service account created after this point will get secrets that include both old and new CAs.
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Remove the flag `-client-ca-file` from the *Kubernetes controller manager* configuration.
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You can also replace the existing client CA file or change this configuration item to reference a new, updated CA.
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[Issue 1350](https://github.com/kubernetes/kubeadm/issues/1350) tracks an issue with *Kubernetes controller manager* being unable to accept a CA bundle.
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{{< note >}}
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The files specified by the kube-controller-manager flags `--client-ca-file` and `--cluster-signing-cert-file`
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cannot be CA bundles. If these flags and `--root-ca-file` point to the same `ca.crt` file which is now a
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bundle (includes both old and new CA) you will face an error. To workaround this problem you can copy the new CA to a separate
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file and make the flags `--client-ca-file` and `--cluster-signing-cert-file` point to the copy. Once `ca.crt` is no longer
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a bundle you can restore the problem flags to point to `ca.crt` and delete the copy.
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