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Move control plane certs renewal "spread out" into the systemd timer #10596

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Nov 8, 2023
Merged

Move control plane certs renewal "spread out" into the systemd timer #10596

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c691e1e
Use RandomizedDelaySec to spread out control certificates renewal plane
VannTen Nov 6, 2023
01b17ae
Make k8s-certs-renew.timer Persistent
VannTen Nov 6, 2023
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3 changes: 1 addition & 2 deletions roles/kubernetes/control-plane/defaults/main/main.yml
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Expand Up @@ -222,8 +222,7 @@ event_ttl_duration: "1h0m0s"
## Automatically renew K8S control plane certificates on first Monday of each month
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' }}"
auto_renew_certificates_systemd_calendar: "Mon *-*-1,2,3,4,5,6,7 03:00:00"
# 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
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3 changes: 3 additions & 0 deletions roles/kubernetes/control-plane/templates/k8s-certs-renew.timer.j2
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Expand Up @@ -3,6 +3,9 @@ Description=Timer to renew K8S control plane certificates

[Timer]
OnCalendar={{ auto_renew_certificates_systemd_calendar }}
RandomizedDelaySec={{ 10 * (groups['kube_control_plane'] | length) }}min
FixedRandomDelay=yes
Persistent=yes

[Install]
WantedBy=multi-user.target