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WalkthroughThis change adds Helm chart metadata and rendering for Kured, configures its reboot schedule and notification URL, and adds Kubernetes workload, access-control, namespace, and Kustomize resources. ChangesKured deployment
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Merge Risk: 🟡 Moderate · up to As configured, Kured can leave a node cordoned for about an hour after a failed drain. It can also reboot after the 05:15 cutoff, and it can reboot Linux nodes outside k1–k5. Resolve these maintenance-window and scope gaps before merging. Pre-merge checks |
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| Check name | Status | Explanation |
|---|---|---|
| Docstring Coverage |  |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0… |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
| Description check | |
The description clearly explains the Kured deployment, reboot schedule, safety gates, draining behavior, and Slack notifications described by the changeset. |
| Title check | |
The title clearly and concisely summarizes the main change: using Kured to reboot Kubernetes nodes. |
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @kubernetes/kured/helm/templates/daemonset.yaml:
- Around line 117-118: Update the DaemonSet’s node constraints so Kured runs
only on the intended k1–k5 nodes, rather than every Linux node. Add and select a
label assigned only to those nodes, or use required node affinity matching their
names; retain the Linux constraint as needed.
- Line 53: Update the --end-time maintenance-window setting so draining and the
configured 60-second reboot delay finish by 05:15 ET; set an earlier cutoff that
reserves sufficient time, or enforce a final cutoff immediately before reboot.
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kubernetes/kured/Chart.yamlkubernetes/kured/externalsecret.yamlkubernetes/kured/helm/templates/clusterrole.yamlkubernetes/kured/helm/templates/clusterrolebinding.yamlkubernetes/kured/helm/templates/daemonset.yamlkubernetes/kured/helm/templates/role.yamlkubernetes/kured/helm/templates/rolebinding.yamlkubernetes/kured/helm/templates/serviceaccount.yamlkubernetes/kured/kustomization.yamlkubernetes/kured/namespace.yamlkubernetes/kured/renderkubernetes/kured/values.yaml
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Unattended upgrades install kernel updates on k1-k5 but never reboot, so each new kernel waits for someone to reboot the node by hand. Kured watches /run/reboot-required on every node and reboots one node at a time: cordon, drain, reboot, uncordon. Reboots happen between 04:15 and 05:15 ET, after the 04:00 descheduler and cluster backup, and never on Thursday, when Renovate's auto-merged Ansible deploys run. A node is held back while a restic job is running on it or the control-plane backup is running there, or while NodeDown, PodStuckNotRunning, PodNotReady or a CNPG alert is pending or firing. Counting pending alerts makes the gate trip within a minute or two of a pod or database replica going missing rather than after each alert's 5 to 60 minute threshold, so it also checks that the previous node's workloads have settled. The lock is held for 10 minutes after a node returns, long enough for Prometheus to see anything that did not come back, which fits two or three nodes in a night. A drain that cannot finish in 30 minutes is abandoned and retried instead of forced. PodNotReady is added to the Prometheus rules separately. Kured runs in its own kured namespace and posts drain and reboot messages to Slack #alerts through the webhook Alertmanager uses, read from 1Password by an ExternalSecret. No GPU guard is needed on k2: if DKMS fails to build the NVIDIA module for a new kernel, the kernel install hooks stop before the reboot flag is written.
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Unattended upgrades install kernel updates on k1-k5 but never reboot, so each new kernel waits for someone to reboot the node by hand. Kured watches /run/reboot-required on every node and reboots one node at a time: cordon, drain, reboot, uncordon.
Reboots happen between 04:15 and 05:15 ET, after the 04:00 descheduler and cluster backup, and never on Thursday, when Renovate's auto-merged Ansible deploys run. A node is held back while a restic job is running on it or the control-plane backup is running there, or while NodeDown, PodStuckNotRunning, PodNotReady or a CNPG alert is pending or firing. Counting pending alerts makes the gate trip within a minute or two of a pod or database replica going missing rather than after each alert's 5 to 60 minute threshold, so it also checks that the previous node's workloads have settled. The lock is held for 10 minutes after a node returns, long enough for Prometheus to see anything that did not come back, which fits two or three nodes in a night. A drain that cannot finish in 30 minutes is abandoned and retried instead of forced. PodNotReady is added to the Prometheus rules separately.
Kured runs in its own kured namespace and posts drain and reboot messages to Slack #alerts through the webhook Alertmanager uses, read from 1Password by an ExternalSecret. No GPU guard is needed on k2: if DKMS fails to build the NVIDIA module for a new kernel, the kernel install hooks stop before the reboot flag is written.