Add option to kubeadm upgrade command to control certificates renewal during...

Add option to kubeadm upgrade command to control certificates renewal during control plane upgrade (#7976)

* Add option to kubeadm upgrade command to control certificates renewal during control plane upgrade

* Remove training whitespace

roles/kubernetes/control-plane/defaults/main/main.yml

@@ -193,3 +193,7 @@ event_ttl_duration: "1h0m0s"
 auto_renew_certificates: false
 # First Monday of each month
 auto_renew_certificates_systemd_calendar: "Mon *-*-1,2,3,4,5,6,7 03:{{ groups['kube_control_plane'].index(inventory_hostname) }}0:00"
+# kubeadm renews all the certificates during control plane upgrade.
+# If we have requirement like without renewing certs upgrade the cluster,
+# we can opt out from the default behavior by setting kubeadm_upgrade_auto_cert_renewal to false
+kubeadm_upgrade_auto_cert_renewal: true

roles/kubernetes/control-plane/tasks/kubeadm-upgrade.yml

@@ -14,6 +14,7 @@
     timeout -k 600s 600s
     {{ bin_dir }}/kubeadm
     upgrade apply -y {{ kube_version }}
+    --certificate-renewal={{ kubeadm_upgrade_auto_cert_renewal }}
     --config={{ kube_config_dir }}/kubeadm-config.yaml
     --ignore-preflight-errors=all
     --allow-experimental-upgrades
@@ -34,6 +35,7 @@
     timeout -k 600s 600s
     {{ bin_dir }}/kubeadm
     upgrade apply -y {{ kube_version }}
+    --certificate-renewal={{ kubeadm_upgrade_auto_cert_renewal }}
     --config={{ kube_config_dir }}/kubeadm-config.yaml
     --ignore-preflight-errors=all
     --allow-experimental-upgrades