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Convert scale-down pdb check to drainability rule
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| /* | ||
| Copyright 2023 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
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| package drainability | ||
|
|
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| import ( | ||
| policyv1 "k8s.io/api/policy/v1" | ||
| ) | ||
|
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| // DrainContext contains parameters for drainability rules. | ||
| type DrainContext struct { | ||
| Pdbs []*policyv1.PodDisruptionBudget | ||
| } |
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58 changes: 58 additions & 0 deletions
58
cluster-autoscaler/simulator/drainability/rules/pdb/pdb.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| /* | ||
| Copyright 2023 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
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| package pdb | ||
|
|
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| import ( | ||
| "fmt" | ||
|
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| apiv1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/labels" | ||
| "k8s.io/autoscaler/cluster-autoscaler/simulator/drainability" | ||
| "k8s.io/autoscaler/cluster-autoscaler/utils/drain" | ||
| ) | ||
|
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| // Rule is a drainability rule on how to handle pods with pdbs. | ||
| type Rule struct{} | ||
|
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| // New creates a new PdbRule. | ||
| func New() *Rule { | ||
| return &Rule{} | ||
| } | ||
|
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| // Drainable decides how to handle pods with pdbs on node drain. | ||
| func (Rule) Drainable(drainCtx *drainability.DrainContext, pod *apiv1.Pod) drainability.Status { | ||
| if drainCtx == nil { | ||
| return drainability.NewUndefinedStatus() | ||
| } | ||
|
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| // TODO: Replace this logic with RemainingPdbTracker.CanRemovePods() after | ||
| // deprecating legacy scale down. Depending on the implementation, this may | ||
| // require adding information to the DrainContext, such as the slice of pods | ||
| // and a flag to prevent duplicate checks. | ||
| for _, pdb := range drainCtx.Pdbs { | ||
| selector, err := metav1.LabelSelectorAsSelector(pdb.Spec.Selector) | ||
| if err != nil { | ||
| return drainability.NewBlockedStatus(drain.UnexpectedError, fmt.Errorf("failed to convert label selector")) | ||
| } | ||
|
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| if pod.Namespace == pdb.Namespace && selector.Matches(labels.Set(pod.Labels)) && pdb.Status.DisruptionsAllowed < 1 { | ||
| return drainability.NewBlockedStatus(drain.NotEnoughPdb, fmt.Errorf("not enough pod disruption budget to move %s/%s", pod.Namespace, pod.Name)) | ||
| } | ||
| } | ||
| return drainability.NewUndefinedStatus() | ||
| } |
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