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Enable Graceful Node Shutdown for Kubernetes >= 1.21.0 (#7746)

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* Enable Graceful Node Shutdown for Kubernetes >= 1.21.0

* Add sample graceful shutdown parameters
This commit is contained in:
Cristian Calin
2021-06-28 09:53:25 +03:00
committed by GitHub
parent a2cf6816ce
commit a3e34f589a
4 changed files with 22 additions and 0 deletions
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4
roles/kubernetes/node/templates/kubelet-config.v1beta1.yaml.j2
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@@ -96,3 +96,7 @@ tlsCipherSuites:
{% if kubelet_event_record_qps %}
eventRecordQPS: {{ kubelet_event_record_qps }}
{% endif %}
{% if kube_version is version('v1.21.0', '>=') %}
shutdownGracePeriod: {{ kubelet_shutdown_grace_period }}
shutdownGracePeriodCriticalPods: {{ kubelet_shutdown_grace_period_critical_pods }}
{% endif %}

7
roles/kubernetes/preinstall/tasks/0020-verify-settings.yml
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@@ -107,6 +107,13 @@
- not ignore_assert_errors
- inventory_hostname in groups['kube_node']
- name: Stop when ShutdownGracePeriod less than ShutdownGracePeriodCriticalPods
assert:
that: kubelet_shutdown_grace_period > kubelet_shutdown_grace_period_critical_pods
msg: "ShutdownGracePeriod ({{ kubelet_shutdown_grace_period }}) needs to be greater than ShutdownGracePeriodCriticalPods ({{ kubelet_shutdown_grace_period_critical_pods }}) in order to give normal pods time to be evacuated, please see https://kubernetes.io/blog/2021/04/21/graceful-node-shutdown-beta/ for details"
when:
- kube_version is version('v1.21.0', '>=')
# This assertion will fail on the safe side: One can indeed schedule more pods
# on a node than the CIDR-range has space for when additional pods use the host
# network namespace. It is impossible to ascertain the number of such pods at