122 lines
4.1 KiB
Go
122 lines
4.1 KiB
Go
/*
|
|
Copyright 2016 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.
|
|
*/
|
|
|
|
package simulator
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
kube_util "k8s.io/contrib/cluster-autoscaler/utils/kubernetes"
|
|
apiv1 "k8s.io/kubernetes/pkg/api/v1"
|
|
kube_client "k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
|
|
informers "k8s.io/kubernetes/pkg/client/informers/informers_generated/externalversions"
|
|
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
|
|
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
|
|
"k8s.io/kubernetes/plugin/pkg/scheduler/factory"
|
|
"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
|
|
|
|
// We need to import provider to intialize default scheduler.
|
|
_ "k8s.io/kubernetes/plugin/pkg/scheduler/algorithmprovider"
|
|
)
|
|
|
|
// PredicateChecker checks whether all required predicates are matched for given Pod and Node
|
|
type PredicateChecker struct {
|
|
predicates map[string]algorithm.FitPredicate
|
|
}
|
|
|
|
// NewPredicateChecker builds PredicateChecker.
|
|
func NewPredicateChecker(kubeClient kube_client.Interface) (*PredicateChecker, error) {
|
|
provider, err := factory.GetAlgorithmProvider(factory.DefaultProvider)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
informerFactory := informers.NewSharedInformerFactory(kubeClient, 0)
|
|
|
|
schedulerConfigFactory := factory.NewConfigFactory(
|
|
"cluster-autoscaler",
|
|
kubeClient,
|
|
informerFactory.Core().V1().Nodes(),
|
|
informerFactory.Core().V1().PersistentVolumes(),
|
|
informerFactory.Core().V1().PersistentVolumeClaims(),
|
|
informerFactory.Core().V1().ReplicationControllers(),
|
|
informerFactory.Extensions().V1beta1().ReplicaSets(),
|
|
informerFactory.Core().V1().Services(),
|
|
apiv1.DefaultHardPodAffinitySymmetricWeight,
|
|
)
|
|
|
|
predicates, err := schedulerConfigFactory.GetPredicates(provider.FitPredicateKeys)
|
|
predicates["ready"] = isNodeReadyAndSchedulablePredicate
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
schedulerConfigFactory.Run()
|
|
return &PredicateChecker{
|
|
predicates: predicates,
|
|
}, nil
|
|
}
|
|
|
|
func isNodeReadyAndSchedulablePredicate(pod *apiv1.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool,
|
|
[]algorithm.PredicateFailureReason, error) {
|
|
ready := kube_util.IsNodeReadyAndSchedulable(nodeInfo.Node())
|
|
if !ready {
|
|
return false, []algorithm.PredicateFailureReason{predicates.NewFailureReason("node is unready")}, nil
|
|
}
|
|
return true, []algorithm.PredicateFailureReason{}, nil
|
|
}
|
|
|
|
// NewTestPredicateChecker builds test version of PredicateChecker.
|
|
func NewTestPredicateChecker() *PredicateChecker {
|
|
return &PredicateChecker{
|
|
predicates: map[string]algorithm.FitPredicate{
|
|
"default": predicates.GeneralPredicates,
|
|
"ready": isNodeReadyAndSchedulablePredicate,
|
|
},
|
|
}
|
|
}
|
|
|
|
// FitsAny checks if the given pod can be place on any of the given nodes.
|
|
func (p *PredicateChecker) FitsAny(pod *apiv1.Pod, nodeInfos map[string]*schedulercache.NodeInfo) (string, error) {
|
|
for name, nodeInfo := range nodeInfos {
|
|
// Be sure that the node is schedulable.
|
|
if nodeInfo.Node().Spec.Unschedulable {
|
|
continue
|
|
}
|
|
if err := p.CheckPredicates(pod, nodeInfo); err == nil {
|
|
return name, nil
|
|
}
|
|
}
|
|
return "", fmt.Errorf("cannot put pod %s on any node", pod.Name)
|
|
}
|
|
|
|
// CheckPredicates checks if the given pod can be placed on the given node.
|
|
func (p *PredicateChecker) CheckPredicates(pod *apiv1.Pod, nodeInfo *schedulercache.NodeInfo) error {
|
|
for _, predicate := range p.predicates {
|
|
match, failureReason, err := predicate(pod, nil, nodeInfo)
|
|
|
|
nodename := "unknown"
|
|
if nodeInfo.Node() != nil {
|
|
nodename = nodeInfo.Node().Name
|
|
}
|
|
if err != nil {
|
|
return fmt.Errorf("cannot put %s on %s due to %v", pod.Name, nodename, err)
|
|
}
|
|
if !match {
|
|
return fmt.Errorf("cannot put %s on %s, reason: %v", pod.Name, nodename, failureReason)
|
|
}
|
|
}
|
|
return nil
|
|
}
|