Configure Graceful Node Shutdown and lengthen max inhibitor delay

* Configure Kubelet Graceful Node Shutdown to detect system shutdown events and stop running containers gracefully when possible * Allow up to 30s for critical pods to gracefully shutdown * Allow up to 15s for regular pods to gracefully shutdown * Node will be marked as NotReady promptly, instead of having to wait for health checks * Kubelet uses systemd inhibitor locks to delay shutdown for a limited number of seconds * Raise the default max inhibitor time from 5s to 45s Verify systemd inhibitor locks are present: ``` sudo systemd-inhibit --list WHO UID USER PID COMM WHAT WHY MODE kubelet 0 root 4581 kubelet shutdown Kubelet needs time to handle node shutdown delay ``` Tail journal logs and then shutdown a node via systemctl reboot or via the cloud console to watch container shutdown Rel: * https://kubernetes.io/blog/2021/04/21/graceful-node-shutdown-beta/ * https://kubernetes.io/docs/reference/config-api/kubelet-config.v1beta1/ * https://github.com/kubernetes/kubernetes/issues/107043 * https://github.com/coreos/fedora-coreos-tracker/issues/821 * https://www.freedesktop.org/software/systemd/man/systemd-inhibit.html * https://github.com/kubernetes/kubernetes/blob/release-1.24/pkg/kubelet/nodeshutdown/nodeshutdown_manager_linux.go * https://github.com/godbus/dbus/blob/master/conn.go
2022-08-28 09:49:28 -07:00 · 2022-08-28 09:49:28 -07:00 · 393a38deff
parent 76d92e9c2d
commit 393a38deff
21 changed files with 146 additions and 0 deletions
--- a/CHANGES.md
+++ b/CHANGES.md
@ -6,6 +6,12 @@ Notable changes between versions.

 * Kubernetes [v1.25.0](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.25.md#v1250)
  * Disable LocalStorageCapacityIsolationFSQuotaMonitoring feature gate ([#1220](https://github.com/poseidon/typhoon/pull/1220))
+* Migrate most Kubelet flags to KubeletConfiguration file ([#1219](https://github.com/poseidon/typhoon/pull/1219))
+* Configure Kubelet Graceful Node Shutdown ([#1222](https://github.com/poseidon/typhoon/pull/1222))
+  * Allow up to 30s for critical pods to gracefully shutdown on node shutdown
+  * Allow up to 15s for regular pods to gracefully shutdown on node shutdown
+  * Mark node NotReady promptly on node shutdown
+  * Lengthen systemd inhibitor lock max delay from 5s to 45s

 ### Fedora CoreOS

--- a/aws/fedora-coreos/kubernetes/butane/controller.yaml
+++ b/aws/fedora-coreos/kubernetes/butane/controller.yaml
@ -154,6 +154,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -194,6 +196,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/aws/fedora-coreos/kubernetes/workers/butane/worker.yaml
+++ b/aws/fedora-coreos/kubernetes/workers/butane/worker.yaml
@ -122,10 +122,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/aws/flatcar-linux/kubernetes/butane/controller.yaml
+++ b/aws/flatcar-linux/kubernetes/butane/controller.yaml
@ -153,6 +153,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -193,6 +195,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/aws/flatcar-linux/kubernetes/workers/butane/worker.yaml
+++ b/aws/flatcar-linux/kubernetes/workers/butane/worker.yaml
@ -121,10 +121,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/azure/fedora-coreos/kubernetes/butane/controller.yaml
+++ b/azure/fedora-coreos/kubernetes/butane/controller.yaml
@ -149,6 +149,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -189,6 +191,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/azure/fedora-coreos/kubernetes/workers/butane/worker.yaml
+++ b/azure/fedora-coreos/kubernetes/workers/butane/worker.yaml
@ -117,10 +117,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/azure/flatcar-linux/kubernetes/butane/controller.yaml
+++ b/azure/flatcar-linux/kubernetes/butane/controller.yaml
@ -149,6 +149,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -189,6 +191,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/azure/flatcar-linux/kubernetes/workers/butane/worker.yaml
+++ b/azure/flatcar-linux/kubernetes/workers/butane/worker.yaml
@ -117,10 +117,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/bare-metal/fedora-coreos/kubernetes/butane/controller.yaml
+++ b/bare-metal/fedora-coreos/kubernetes/butane/controller.yaml
@ -159,6 +159,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -199,6 +201,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/bare-metal/fedora-coreos/kubernetes/butane/worker.yaml
+++ b/bare-metal/fedora-coreos/kubernetes/butane/worker.yaml
@ -113,10 +113,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/bare-metal/flatcar-linux/kubernetes/butane/controller.yaml
+++ b/bare-metal/flatcar-linux/kubernetes/butane/controller.yaml
@ -160,6 +160,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -200,6 +202,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/bare-metal/flatcar-linux/kubernetes/butane/worker.yaml
+++ b/bare-metal/flatcar-linux/kubernetes/butane/worker.yaml
@ -118,10 +118,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/digital-ocean/fedora-coreos/kubernetes/butane/controller.yaml
+++ b/digital-ocean/fedora-coreos/kubernetes/butane/controller.yaml
@ -156,6 +156,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -196,6 +198,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/digital-ocean/fedora-coreos/kubernetes/butane/worker.yaml
+++ b/digital-ocean/fedora-coreos/kubernetes/butane/worker.yaml
@ -122,10 +122,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/digital-ocean/flatcar-linux/kubernetes/butane/controller.yaml
+++ b/digital-ocean/flatcar-linux/kubernetes/butane/controller.yaml
@ -158,6 +158,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -198,6 +200,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/digital-ocean/flatcar-linux/kubernetes/butane/worker.yaml
+++ b/digital-ocean/flatcar-linux/kubernetes/butane/worker.yaml
@ -121,10 +121,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/google-cloud/fedora-coreos/kubernetes/butane/controller.yaml
+++ b/google-cloud/fedora-coreos/kubernetes/butane/controller.yaml
@ -148,6 +148,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -188,6 +190,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/google-cloud/fedora-coreos/kubernetes/workers/butane/worker.yaml
+++ b/google-cloud/fedora-coreos/kubernetes/workers/butane/worker.yaml
@ -116,10 +116,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      contents:
        inline: |
--- a/google-cloud/flatcar-linux/kubernetes/butane/controller.yaml
+++ b/google-cloud/flatcar-linux/kubernetes/butane/controller.yaml
@ -148,6 +148,8 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
@ -188,6 +190,11 @@ storage:
             echo "Retry applying manifests"
             sleep 5
          done
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents:
--- a/google-cloud/flatcar-linux/kubernetes/workers/butane/worker.yaml
+++ b/google-cloud/flatcar-linux/kubernetes/workers/butane/worker.yaml
@ -116,10 +116,17 @@ storage:
          featureGates:
            LocalStorageCapacityIsolationFSQuotaMonitoring: false
          rotateCertificates: true
+          shutdownGracePeriod: 45s
+          shutdownGracePeriodCriticalPods: 30s
          staticPodPath: /etc/kubernetes/manifests
          readOnlyPort: 0
          resolvConf: /run/systemd/resolve/resolv.conf
          volumePluginDir: /var/lib/kubelet/volumeplugins
+    - path: /etc/systemd/logind.conf.d/inhibitors.conf
+      contents:
+        inline: |
+          [Login]
+          InhibitDelayMaxSec=45s
    - path: /etc/sysctl.d/max-user-watches.conf
      mode: 0644
      contents: