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feat: support eviction of failed bare pods

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This patch adds the policy(evictFailedBarePods) to allow the failed
pods without ownerReferences to be evicted. For backward compatibility,
disable the policy by default. Address #644.
This commit is contained in:
babygoat
2022-01-03 10:19:48 +08:00
parent 2b23694704
commit 1529180d70
27 changed files with 101 additions and 15 deletions
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README.md
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@@ -132,6 +132,7 @@ The policy includes a common configuration that applies to all the strategies:
| `evictSystemCriticalPods` | `false` | [Warning: Will evict Kubernetes system pods] allows eviction of pods with any priority, including system pods like kube-dns |
| `ignorePvcPods` | `false` | set whether PVC pods should be evicted or ignored |
| `maxNoOfPodsToEvictPerNode` | `nil` | maximum number of pods evicted from each node (summed through all strategies) |
| `evictFailedBarePods` | `false` | allow eviction of pods without owner references and in failed phase |
As part of the policy, the parameters associated with each strategy can be configured.
See each strategy for details on available parameters.
@@ -142,6 +143,7 @@ See each strategy for details on available parameters.
apiVersion: "descheduler/v1alpha1"
kind: "DeschedulerPolicy"
nodeSelector: prod=dev
evictFailedBarePods: false
evictLocalStoragePods: true
evictSystemCriticalPods: true
maxNoOfPodsToEvictPerNode: 40
@@ -740,8 +742,8 @@ Using Deployments instead of ReplicationControllers provides an automated rollou
When the descheduler decides to evict pods from a node, it employs the following general mechanism:
* [Critical pods](https://kubernetes.io/docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods/) (with priorityClassName set to system-cluster-critical or system-node-critical) are never evicted (unless `evictSystemCriticalPods: true` is set).
* Pods (static or mirrored pods or stand alone pods) not part of an ReplicationController, ReplicaSet(Deployment), StatefulSet, or Job are
never evicted because these pods won't be recreated.
* Pods (static or mirrored pods or standalone pods) not part of an ReplicationController, ReplicaSet(Deployment), StatefulSet, or Job are
never evicted because these pods won't be recreated. (Standalone pods in failed status phase can be evicted by setting `evictFailedBarePods: true`)
* Pods associated with DaemonSets are never evicted.
* Pods with local storage are never evicted (unless `evictLocalStoragePods: true` is set).
* Pods with PVCs are evicted (unless `ignorePvcPods: true` is set).