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kubelet: Record kubelet_evictions when limits are hit

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The pod, container, and emptyDir volumes can all trigger evictions
when their limits are breached. To ensure that administrators can
alert on these type of evictions, update kubelet_evictions to include
the following signal types:

* ephemeralcontainerfs.limit - container ephemeral storage breaches its limit
* ephemeralpodfs.limit - pod ephemeral storage breaches its limit
* emptydirfs.limit - pod emptyDir storage breaches its limit
This commit is contained in:
Clayton Coleman 2020-02-06 17:14:59 -05:00
parent 6a92f19444
commit af9e0be163
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GPG Key ID: 3D16906B4F1C5CB3
1 changed files with 24 additions and 4 deletions
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28
pkg/kubelet/eviction/eviction_manager.go
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@ -47,6 +47,15 @@ const (
podCleanupPollFreq = time.Second
)
const (
// signalEphemeralContainerFsLimit is amount of storage available on filesystem requested by the container
signalEphemeralContainerFsLimit string = "ephemeralcontainerfs.limit"
// signalEphemeralPodFsLimit is amount of storage available on filesystem requested by the pod
signalEphemeralPodFsLimit string = "ephemeralpodfs.limit"
// signalEmptyDirFsLimit is amount of storage available on filesystem requested by an emptyDir
signalEmptyDirFsLimit string = "emptydirfs.limit"
)
// managerImpl implements Manager
type managerImpl struct {
// used to track time
@ -480,7 +489,11 @@ func (m *managerImpl) emptyDirLimitEviction(podStats statsapi.PodStats, pod *v1.
used := podVolumeUsed[pod.Spec.Volumes[i].Name]
if used != nil && size != nil && size.Sign() == 1 && used.Cmp(*size) > 0 {
// the emptyDir usage exceeds the size limit, evict the pod
return m.evictPod(pod, 0, fmt.Sprintf(emptyDirMessageFmt, pod.Spec.Volumes[i].Name, size.String()), nil)
if m.evictPod(pod, 0, fmt.Sprintf(emptyDirMessageFmt, pod.Spec.Volumes[i].Name, size.String()), nil) {
metrics.Evictions.WithLabelValues(signalEmptyDirFsLimit).Inc()
return true
}
return false
}
}
}
@ -512,7 +525,11 @@ func (m *managerImpl) podEphemeralStorageLimitEviction(podStats statsapi.PodStat
podEphemeralStorageLimit := podLimits[v1.ResourceEphemeralStorage]
if podEphemeralStorageTotalUsage.Cmp(podEphemeralStorageLimit) > 0 {
// the total usage of pod exceeds the total size limit of containers, evict the pod
return m.evictPod(pod, 0, fmt.Sprintf(podEphemeralStorageMessageFmt, podEphemeralStorageLimit.String()), nil)
if m.evictPod(pod, 0, fmt.Sprintf(podEphemeralStorageMessageFmt, podEphemeralStorageLimit.String()), nil) {
metrics.Evictions.WithLabelValues(signalEphemeralPodFsLimit).Inc()
return true
}
return false
}
return false
}
@ -534,8 +551,11 @@ func (m *managerImpl) containerEphemeralStorageLimitEviction(podStats statsapi.P
if ephemeralStorageThreshold, ok := thresholdsMap[containerStat.Name]; ok {
if ephemeralStorageThreshold.Cmp(*containerUsed) < 0 {
return m.evictPod(pod, 0, fmt.Sprintf(containerEphemeralStorageMessageFmt, containerStat.Name, ephemeralStorageThreshold.String()), nil)
if m.evictPod(pod, 0, fmt.Sprintf(containerEphemeralStorageMessageFmt, containerStat.Name, ephemeralStorageThreshold.String()), nil) {
metrics.Evictions.WithLabelValues(signalEphemeralContainerFsLimit).Inc()
return true
}
return false
}
}
}