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

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
 

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: |

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: |

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:

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:

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: |

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: |

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:

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:

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: |

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: |

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:

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:

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: |

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: |

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:

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:

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: |

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: |

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:

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: