mirror of
https://github.com/kubernetes-sigs/descheduler.git
synced 2026-01-26 13:29:11 +01:00
269 lines
9.0 KiB
Go
269 lines
9.0 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package v1alpha1
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import (
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"context"
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"fmt"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/conversion"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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"k8s.io/client-go/informers"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/klog/v2"
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"sigs.k8s.io/descheduler/pkg/api"
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"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
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podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
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"sigs.k8s.io/descheduler/pkg/framework"
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"sigs.k8s.io/descheduler/pkg/framework/pluginregistry"
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"sigs.k8s.io/descheduler/pkg/framework/plugins/defaultevictor"
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)
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var (
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// pluginArgConversionScheme is a scheme with internal and v1alpha2 registered,
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// used for defaulting/converting typed PluginConfig Args.
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// Access via getPluginArgConversionScheme()
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Scheme = runtime.NewScheme()
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Codecs = serializer.NewCodecFactory(Scheme, serializer.EnableStrict)
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)
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// evictorImpl implements the Evictor interface so plugins
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// can evict a pod without importing a specific pod evictor
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type evictorImpl struct {
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podEvictor *evictions.PodEvictor
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evictorFilter framework.EvictorPlugin
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}
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var _ framework.Evictor = &evictorImpl{}
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// Filter checks if a pod can be evicted
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func (ei *evictorImpl) Filter(pod *v1.Pod) bool {
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return ei.evictorFilter.Filter(pod)
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}
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// PreEvictionFilter checks if pod can be evicted right before eviction
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func (ei *evictorImpl) PreEvictionFilter(pod *v1.Pod) bool {
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return ei.evictorFilter.PreEvictionFilter(pod)
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}
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// Evict evicts a pod (no pre-check performed)
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func (ei *evictorImpl) Evict(ctx context.Context, pod *v1.Pod, opts evictions.EvictOptions) bool {
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return ei.podEvictor.EvictPod(ctx, pod, opts)
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}
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func (ei *evictorImpl) NodeLimitExceeded(node *v1.Node) bool {
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return ei.podEvictor.NodeLimitExceeded(node)
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}
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// handleImpl implements the framework handle which gets passed to plugins
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type handleImpl struct {
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clientSet clientset.Interface
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getPodsAssignedToNodeFunc podutil.GetPodsAssignedToNodeFunc
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sharedInformerFactory informers.SharedInformerFactory
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evictor *evictorImpl
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}
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var _ framework.Handle = &handleImpl{}
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// ClientSet retrieves kube client set
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func (hi *handleImpl) ClientSet() clientset.Interface {
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return hi.clientSet
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}
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// GetPodsAssignedToNodeFunc retrieves GetPodsAssignedToNodeFunc implementation
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func (hi *handleImpl) GetPodsAssignedToNodeFunc() podutil.GetPodsAssignedToNodeFunc {
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return hi.getPodsAssignedToNodeFunc
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}
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// SharedInformerFactory retrieves shared informer factory
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func (hi *handleImpl) SharedInformerFactory() informers.SharedInformerFactory {
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return hi.sharedInformerFactory
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}
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// Evictor retrieves evictor so plugins can filter and evict pods
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func (hi *handleImpl) Evictor() framework.Evictor {
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return hi.evictor
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}
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func Convert_v1alpha1_DeschedulerPolicy_To_api_DeschedulerPolicy(in *DeschedulerPolicy, out *api.DeschedulerPolicy, s conversion.Scope) error {
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err := V1alpha1ToInternal(in, pluginregistry.PluginRegistry, out, s)
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if err != nil {
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return err
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}
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return nil
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}
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func V1alpha1ToInternal(
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deschedulerPolicy *DeschedulerPolicy,
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registry pluginregistry.Registry,
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out *api.DeschedulerPolicy,
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s conversion.Scope,
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) error {
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var evictLocalStoragePods bool
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if deschedulerPolicy.EvictLocalStoragePods != nil {
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evictLocalStoragePods = *deschedulerPolicy.EvictLocalStoragePods
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}
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evictBarePods := false
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if deschedulerPolicy.EvictFailedBarePods != nil {
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evictBarePods = *deschedulerPolicy.EvictFailedBarePods
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if evictBarePods {
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klog.V(1).Info("Warning: EvictFailedBarePods is set to True. This could cause eviction of pods without ownerReferences.")
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}
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}
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evictSystemCriticalPods := false
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if deschedulerPolicy.EvictSystemCriticalPods != nil {
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evictSystemCriticalPods = *deschedulerPolicy.EvictSystemCriticalPods
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if evictSystemCriticalPods {
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klog.V(1).Info("Warning: EvictSystemCriticalPods is set to True. This could cause eviction of Kubernetes system pods.")
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}
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}
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ignorePvcPods := false
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if deschedulerPolicy.IgnorePVCPods != nil {
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ignorePvcPods = *deschedulerPolicy.IgnorePVCPods
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}
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var profiles []api.Profile
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// Build profiles
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for name, strategy := range deschedulerPolicy.Strategies {
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if _, ok := pluginregistry.PluginRegistry[string(name)]; ok {
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if strategy.Enabled {
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params := strategy.Params
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if params == nil {
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params = &StrategyParameters{}
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}
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nodeFit := false
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if name != "PodLifeTime" {
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nodeFit = params.NodeFit
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}
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if params.ThresholdPriority != nil && params.ThresholdPriorityClassName != "" {
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klog.ErrorS(fmt.Errorf("priority threshold misconfigured"), "only one of priorityThreshold fields can be set", "pluginName", name)
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return fmt.Errorf("priority threshold misconfigured for plugin %v", name)
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}
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var priorityThreshold *api.PriorityThreshold
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if strategy.Params != nil {
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priorityThreshold = &api.PriorityThreshold{
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Value: strategy.Params.ThresholdPriority,
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Name: strategy.Params.ThresholdPriorityClassName,
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}
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}
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var pluginConfig *api.PluginConfig
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var err error
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if pcFnc, exists := StrategyParamsToPluginArgs[string(name)]; exists {
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pluginConfig, err = pcFnc(params)
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if err != nil {
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klog.ErrorS(err, "skipping strategy", "strategy", name)
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return fmt.Errorf("failed to get plugin config for strategy %v: %v", name, err)
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}
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} else {
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klog.ErrorS(fmt.Errorf("unknown strategy name"), "skipping strategy", "strategy", name)
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return fmt.Errorf("unknown strategy name: %v", name)
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}
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profile := api.Profile{
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Name: fmt.Sprintf("strategy-%v-profile", name),
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PluginConfigs: []api.PluginConfig{
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{
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Name: defaultevictor.PluginName,
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Args: &defaultevictor.DefaultEvictorArgs{
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EvictLocalStoragePods: evictLocalStoragePods,
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EvictSystemCriticalPods: evictSystemCriticalPods,
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IgnorePvcPods: ignorePvcPods,
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EvictFailedBarePods: evictBarePods,
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NodeFit: nodeFit,
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PriorityThreshold: priorityThreshold,
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},
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},
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*pluginConfig,
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},
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Plugins: api.Plugins{
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Evict: api.PluginSet{
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Enabled: []string{defaultevictor.PluginName},
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},
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},
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}
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pluginArgs := registry[string(name)].PluginArgInstance
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pluginInstance, err := registry[string(name)].PluginBuilder(pluginArgs, &handleImpl{})
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if err != nil {
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klog.ErrorS(fmt.Errorf("could not build plugin"), "plugin build error", "plugin", name)
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return fmt.Errorf("could not build plugin: %v", name)
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}
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// pluginInstance can be of any of each type, or both
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profilePlugins := profile.Plugins
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profile.Plugins = enableProfilePluginsByType(profilePlugins, pluginInstance, pluginConfig)
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profiles = append(profiles, profile)
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}
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} else {
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klog.ErrorS(fmt.Errorf("unknown strategy name"), "skipping strategy", "strategy", name)
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return fmt.Errorf("unknown strategy name: %v", name)
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}
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}
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out.Profiles = profiles
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out.NodeSelector = deschedulerPolicy.NodeSelector
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out.MaxNoOfPodsToEvictPerNamespace = deschedulerPolicy.MaxNoOfPodsToEvictPerNamespace
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out.MaxNoOfPodsToEvictPerNode = deschedulerPolicy.MaxNoOfPodsToEvictPerNode
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return nil
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}
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func enableProfilePluginsByType(profilePlugins api.Plugins, pluginInstance framework.Plugin, pluginConfig *api.PluginConfig) api.Plugins {
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profilePlugins = checkBalance(profilePlugins, pluginInstance, pluginConfig)
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profilePlugins = checkDeschedule(profilePlugins, pluginInstance, pluginConfig)
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return profilePlugins
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}
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func checkBalance(profilePlugins api.Plugins, pluginInstance framework.Plugin, pluginConfig *api.PluginConfig) api.Plugins {
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_, ok := pluginInstance.(framework.BalancePlugin)
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if ok {
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klog.V(3).Info("converting Balance plugin: %s", pluginInstance.Name())
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profilePlugins.Balance.Enabled = []string{pluginConfig.Name}
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}
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return profilePlugins
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}
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func checkDeschedule(profilePlugins api.Plugins, pluginInstance framework.Plugin, pluginConfig *api.PluginConfig) api.Plugins {
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_, ok := pluginInstance.(framework.DeschedulePlugin)
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if ok {
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klog.V(3).Info("converting Deschedule plugin: %s", pluginInstance.Name())
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profilePlugins.Deschedule.Enabled = []string{pluginConfig.Name}
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}
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return profilePlugins
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}
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// Register Conversions
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func RegisterConversions(s *runtime.Scheme) error {
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if err := s.AddGeneratedConversionFunc((*DeschedulerPolicy)(nil), (*api.DeschedulerPolicy)(nil), func(a, b interface{}, scope conversion.Scope) error {
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return Convert_v1alpha1_DeschedulerPolicy_To_api_DeschedulerPolicy(a.(*DeschedulerPolicy), b.(*api.DeschedulerPolicy), scope)
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}); err != nil {
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return err
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}
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return nil
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}
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