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kubelet: add warning log and events for cgroup v2 running on kernel < 5.8

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This commit is contained in:
Paco Xu
2024-08-08 21:02:13 +08:00
parent 00236ae0d7
commit 69a67556c7
4 changed files with 23 additions and 2 deletions
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3
pkg/kubelet/cm/container_manager.go
View File

@@ -46,6 +46,9 @@ import (
const (
// Warning message for the users still using cgroup v1
CgroupV1MaintenanceModeWarning = "Cgroup v1 support is in maintenance mode, please migrate to Cgroup v2."
// Warning message for the users using cgroup v2 on kernel older than 5.8
CgroupV2KernelWarning = "Cgroup v2 is being used on a kernel older than 5.8, which may have limited functionality."
)
type ActivePodsFunc func() []*v1.Pod

1
pkg/kubelet/events/event.go
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@@ -77,6 +77,7 @@ const (
FailedPrepareDynamicResources = "FailedPrepareDynamicResources"
PossibleMemoryBackedVolumesOnDisk = "PossibleMemoryBackedVolumesOnDisk"
CgroupV1 = "CgroupV1"
CgroupV2 = "CgroupV2"
)
// Image manager event reason list

16
pkg/kubelet/kubelet.go
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@@ -52,6 +52,7 @@ import (
"k8s.io/apimachinery/pkg/types"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/version"
"k8s.io/apimachinery/pkg/util/wait"
utilfeature "k8s.io/apiserver/pkg/util/feature"
clientset "k8s.io/client-go/kubernetes"
@@ -120,6 +121,7 @@ import (
"k8s.io/kubernetes/pkg/kubelet/volumemanager"
httpprobe "k8s.io/kubernetes/pkg/probe/http"
"k8s.io/kubernetes/pkg/security/apparmor"
utilkernel "k8s.io/kubernetes/pkg/util/kernel"
"k8s.io/kubernetes/pkg/util/oom"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/csi"
@@ -1645,7 +1647,7 @@ func (kl *Kubelet) Run(updates <-chan kubetypes.PodUpdate) {
os.Exit(1)
}
kl.warnCgroupV1Usage()
kl.cgroupVersionCheck()
// Start volume manager
go kl.volumeManager.Run(kl.sourcesReady, wait.NeverStop)
@@ -3067,11 +3069,21 @@ func (kl *Kubelet) UnprepareDynamicResources(pod *v1.Pod) error {
return kl.containerManager.UnprepareDynamicResources(pod)
}
func (kl *Kubelet) warnCgroupV1Usage() {
func (kl *Kubelet) cgroupVersionCheck() {
cgroupVersion := kl.containerManager.GetNodeConfig().CgroupVersion
if cgroupVersion == 1 {
kl.recorder.Eventf(kl.nodeRef, v1.EventTypeWarning, events.CgroupV1, cm.CgroupV1MaintenanceModeWarning)
klog.V(2).InfoS("Warning: cgroup v1", "message", cm.CgroupV1MaintenanceModeWarning)
} else {
kernelVersion, err := utilkernel.GetVersion()
if err != nil {
klog.V(2).ErrorS(err, "Warning: cannot determine kernel version, unable to determine if cgroup v2 is supported", "message", cm.CgroupV1MaintenanceModeWarning)
}
if kernelVersion.LessThan(version.MustParseGeneric(utilkernel.CgroupV2KernelVersion)) {
kl.recorder.Eventf(kl.nodeRef, v1.EventTypeWarning, events.CgroupV2, cm.CgroupV2KernelWarning)
klog.V(2).InfoS("Warning: cgroup v2", "message", cm.CgroupV2KernelWarning)
}
}
metrics.CgroupVersion.Set(float64(cgroupVersion))
}

5
pkg/util/kernel/constants.go
View File

@@ -54,3 +54,8 @@ const TmpfsNoswapSupportKernelVersion = "6.4"
// nftables mode with by default. This is not directly related to any specific kernel
// commit; see https://issues.k8s.io/122743#issuecomment-1893922424
const NFTablesKubeProxyKernelVersion = "5.13"
// CgroupV2KernelVersion is the minimal kernel version required for cgroup v2 support.
// `cpu.stat` file was added to root cgroup.
// (ref: https://github.com/torvalds/linux/commit/936f2a70f2077f64fab1dcb3eca71879e82ecd3f)
const CgroupV2KernelVersion = "5.8"