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kubeadm: add serializable health checks for etcd probes

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Use the etcd 3.5.3+ HTTP(s) endpoint "/health?serializable=true",
to allow the kubelet liveness and starup probes in the
kubeadm generated etcd.yaml (static Pod) to track
individual member health instead of tracking the whole
etcd cluster health.
This commit is contained in:
Lubomir I. Ivanov 2022-05-16 17:38:04 +03:00
parent 45844049fc
commit 29148f61ac
1 changed files with 3 additions and 2 deletions
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5
cmd/kubeadm/app/phases/etcd/local.go
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@ -179,6 +179,7 @@ func CreateStackedEtcdStaticPodManifestFile(client clientset.Interface, manifest
// GetEtcdPodSpec returns the etcd static Pod actualized to the context of the current configuration
// NB. GetEtcdPodSpec methods holds the information about how kubeadm creates etcd static pod manifests.
func GetEtcdPodSpec(cfg *kubeadmapi.ClusterConfiguration, endpoint *kubeadmapi.APIEndpoint, nodeName string, initialCluster []etcdutil.Member) v1.Pod {
const etcdHealthEndpoint = "/health?serializable=true"
pathType := v1.HostPathDirectoryOrCreate
etcdMounts := map[string]v1.Volume{
etcdVolumeName: staticpodutil.NewVolume(etcdVolumeName, cfg.Etcd.Local.DataDir, &pathType),
@ -203,8 +204,8 @@ func GetEtcdPodSpec(cfg *kubeadmapi.ClusterConfiguration, endpoint *kubeadmapi.A
v1.ResourceMemory: resource.MustParse("100Mi"),
},
},
LivenessProbe: staticpodutil.LivenessProbe(probeHostname, "/health", probePort, probeScheme),
StartupProbe: staticpodutil.StartupProbe(probeHostname, "/health", probePort, probeScheme, cfg.APIServer.TimeoutForControlPlane),
LivenessProbe: staticpodutil.LivenessProbe(probeHostname, etcdHealthEndpoint, probePort, probeScheme),
StartupProbe: staticpodutil.StartupProbe(probeHostname, etcdHealthEndpoint, probePort, probeScheme, cfg.APIServer.TimeoutForControlPlane),
},
etcdMounts,
// etcd will listen on the advertise address of the API server, in a different port (2379)