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Fix: check expiry before do breaking renew and container restart actions (#12194)

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* Fix: check expiraty before renew

Since certificate renewal and container restarts involve higher risks,
they should be executed with extra caution.

* squash to Fix: check expiraty before renew

* squash to Fix: address more comments from VannTen

Signed-off-by: Peter Pan <Peter.Pan@daocloud.io>

---------

Signed-off-by: Peter Pan <Peter.Pan@daocloud.io>
This commit is contained in:
Peter Pan
2025-06-05 16:04:41 +08:00
committed by GitHub
parent 6f7822d25c
commit 85b0be144a
2 changed files with 20 additions and 2 deletions
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2
inventory/sample/group_vars/k8s_cluster/k8s-cluster.yml
View File

@@ -346,7 +346,7 @@ 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_patches_dir: "{{ kube_config_dir }}/patches"
kubeadm_patches: []

20
roles/kubernetes/control-plane/templates/k8s-certs-renew.sh.j2
View File

@@ -1,8 +1,26 @@
#!/bin/bash
echo "## Expiration before renewal ##"
echo "## Check Expiration before renewal ##"
{{ bin_dir }}/kubeadm certs check-expiration
days_buffer=7 # set a time margin, because we should not renew at the last moment
calendar={{ auto_renew_certificates_systemd_calendar }}
next_time=$(systemctl show k8s-certs-renew.timer -p NextElapseUSecRealtime --value)
if [ "${next_time}" == "" ]; then
echo "## Skip expiry comparison due to fail to parse next elapse from systemd calendar,do renewal directly ##"
else
current_time=$(date +%s)
target_time=$(date -d "${next_time} + ${days_buffer} days" +%s) # $next_time - $days_buffer days
expiry_threshold=$(( ${target_time} - ${current_time} ))
expired_certs=$({{ bin_dir }}/kubeadm certs check-expiration -o jsonpath="{.certificates[?(@.residualTime<${expiry_threshold}.0)]}")
if [ "${expired_certs}" == "" ];then
echo "## Skip cert renew and K8S container restart, since all residualTimes are beyond threshold ##"
exit 0
fi
fi
echo "## Renewing certificates managed by kubeadm ##"
{{ bin_dir }}/kubeadm certs renew all