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A scheduler plugin imitator that tries to verify if proposed pods wil…
…l be schedulable in the cluster
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package scheduler | ||
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| import ( | ||
| "context" | ||
| "errors" | ||
|
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| "k8s.io/kubernetes/pkg/scheduler/framework" | ||
| plfeature "k8s.io/kubernetes/pkg/scheduler/framework/plugins/feature" | ||
| "k8s.io/kubernetes/pkg/scheduler/framework/plugins/interpodaffinity" | ||
| "k8s.io/kubernetes/pkg/scheduler/framework/plugins/nodeaffinity" | ||
| "k8s.io/kubernetes/pkg/scheduler/framework/plugins/noderesources" | ||
| "k8s.io/kubernetes/pkg/scheduler/framework/plugins/nodeunschedulable" | ||
|
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| corev1 "k8s.io/api/core/v1" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| ) | ||
|
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| func createNodeInfos(ctx context.Context, cli client.Client) ([]*framework.NodeInfo, error) { | ||
| nodes := corev1.NodeList{} | ||
| if err := cli.List(ctx, &nodes); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| nodeInfos := make([]*framework.NodeInfo, 0, len(nodes.Items)) | ||
|
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| for _, node := range nodes.Items { | ||
| nodeInfo := framework.NewNodeInfo() | ||
| nodeInfo.SetNode(&node) | ||
| pods := &corev1.PodList{} | ||
| if err := cli.List(ctx, pods, client.MatchingFields{"spec.nodeName": nodeInfo.Node().Name}); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| for _, pod := range pods.Items { | ||
| nodeInfo.AddPod(&pod) | ||
| } | ||
|
|
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| nodeInfos = append(nodeInfos, nodeInfo) | ||
| } | ||
|
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| return nodeInfos, nil | ||
| } | ||
|
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| // WillTheyFit checks if the proposed pods will be schedulable in the cluster. The ProposedPods must have their | ||
| // labels, tolerations, affinities and resource limits set | ||
| func WillTheyFit(ctx context.Context, cli client.Client, proposedPods []*corev1.Pod) error { | ||
| usableNodes, err := createNodeInfos(ctx, cli) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| state := framework.NewCycleState() | ||
|
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| schedulablePlugin, err := nodeunschedulable.New(ctx, nil, nil) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| noderesourcesPlugin, err := noderesources.NewFit(ctx, nil, nil, plfeature.Features{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| nodeaffinityPlugin, err := nodeaffinity.New(ctx, nil, nil) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| interpodaffinityPlugin, err := interpodaffinity.New(ctx, nil, nil) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| plugins := []framework.FilterPlugin{ | ||
| schedulablePlugin.(framework.FilterPlugin), | ||
| noderesourcesPlugin.(framework.FilterPlugin), | ||
| nodeaffinityPlugin.(framework.FilterPlugin), | ||
| interpodaffinityPlugin.(framework.FilterPlugin), | ||
| } | ||
|
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||
| NextPod: | ||
| for _, pod := range proposedPods { | ||
| for _, node := range usableNodes { | ||
| podInfo, err := framework.NewPodInfo(pod) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| for _, plugin := range plugins { | ||
| status := plugin.Filter(ctx, state, podInfo.Pod, node) | ||
| if status.Code() == framework.Unschedulable { | ||
| continue | ||
| } | ||
| } | ||
|
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| node.AddPod(pod) | ||
| continue NextPod | ||
| // Now we need a way to check if the pod was never added to any node | ||
| // TODO Need more checks like affinities, inter-pod affinities, taints, tolerations | ||
| } | ||
| // Pod was never added to any node | ||
| return errors.New(framework.Unschedulable.String()) | ||
| } | ||
|
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| // Check node condition, will it accept something | ||
| // Need tolerations, taints, affinities.. | ||
| return nil | ||
| } |