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Add an external hostpath provisioner to localkube.
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dlorenc
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Mar 1, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| /* | ||
| Copyright 2016 The Kubernetes Authors All rights reserved. | ||
| 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 localkube | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
| "path" | ||
| "time" | ||
|
|
||
| "github.com/golang/glog" | ||
| "github.com/kubernetes-incubator/external-storage/lib/controller" | ||
| "github.com/kubernetes-incubator/external-storage/lib/leaderelection" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/pkg/api/v1" | ||
| "k8s.io/client-go/pkg/types" | ||
| "k8s.io/client-go/pkg/util/uuid" | ||
| "k8s.io/client-go/pkg/util/wait" | ||
| "k8s.io/client-go/rest" | ||
| ) | ||
|
|
||
| const ( | ||
| resyncPeriod = 15 * time.Second | ||
| provisionerName = "k8s.io/minikube-hostpath" | ||
| exponentialBackOffOnError = false | ||
| failedRetryThreshold = 5 | ||
| leasePeriod = leaderelection.DefaultLeaseDuration | ||
| retryPeriod = leaderelection.DefaultRetryPeriod | ||
| renewDeadline = leaderelection.DefaultRenewDeadline | ||
| termLimit = leaderelection.DefaultTermLimit | ||
| ) | ||
|
|
||
| type hostPathProvisioner struct { | ||
| // The directory to create PV-backing directories in | ||
| pvDir string | ||
|
|
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| // Identity of this hostPathProvisioner, generated. Used to identify "this" | ||
| // provisioner's PVs. | ||
| identity types.UID | ||
| } | ||
|
|
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| func NewHostPathProvisioner() controller.Provisioner { | ||
| return &hostPathProvisioner{ | ||
| pvDir: "/tmp/hostpath-provisioner", | ||
| identity: uuid.NewUUID(), | ||
| } | ||
| } | ||
|
|
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| var _ controller.Provisioner = &hostPathProvisioner{} | ||
|
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| // Provision creates a storage asset and returns a PV object representing it. | ||
| func (p *hostPathProvisioner) Provision(options controller.VolumeOptions) (*v1.PersistentVolume, error) { | ||
| path := path.Join(p.pvDir, options.PVName) | ||
|
|
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| if err := os.MkdirAll(path, 0777); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| pv := &v1.PersistentVolume{ | ||
| ObjectMeta: v1.ObjectMeta{ | ||
| Name: options.PVName, | ||
| Annotations: map[string]string{ | ||
| "hostPathProvisionerIdentity": string(p.identity), | ||
| }, | ||
| }, | ||
| Spec: v1.PersistentVolumeSpec{ | ||
| PersistentVolumeReclaimPolicy: options.PersistentVolumeReclaimPolicy, | ||
| AccessModes: options.PVC.Spec.AccessModes, | ||
| Capacity: v1.ResourceList{ | ||
| v1.ResourceName(v1.ResourceStorage): options.PVC.Spec.Resources.Requests[v1.ResourceName(v1.ResourceStorage)], | ||
| }, | ||
| PersistentVolumeSource: v1.PersistentVolumeSource{ | ||
| HostPath: &v1.HostPathVolumeSource{ | ||
| Path: path, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
|
|
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| return pv, nil | ||
| } | ||
|
|
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| // Delete removes the storage asset that was created by Provision represented | ||
| // by the given PV. | ||
| func (p *hostPathProvisioner) Delete(volume *v1.PersistentVolume) error { | ||
| ann, ok := volume.Annotations["hostPathProvisionerIdentity"] | ||
| if !ok { | ||
| return errors.New("identity annotation not found on PV") | ||
| } | ||
| if ann != string(p.identity) { | ||
| return &controller.IgnoredError{"identity annotation on PV does not match ours"} | ||
| } | ||
|
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| path := path.Join(p.pvDir, volume.Name) | ||
| if err := os.RemoveAll(path); err != nil { | ||
| return err | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| func (lk LocalkubeServer) NewStorageProvisionerServer() Server { | ||
| return NewSimpleServer("storage-provisioner", serverInterval, StartStorageProvisioner(lk)) | ||
| } | ||
|
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| func StartStorageProvisioner(lk LocalkubeServer) func() error { | ||
|
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| // Create an InClusterConfig and use it to create a client for the controller | ||
| // to use to communicate with Kubernetes | ||
| config := rest.Config{Host: "http://localhost:8080"} | ||
| return func() error { | ||
|
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| clientset, err := kubernetes.NewForConfig(&config) | ||
| if err != nil { | ||
| glog.Fatalf("Failed to create client: %v", err) | ||
| } | ||
|
|
||
| // The controller needs to know what the server version is because out-of-tree | ||
| // provisioners aren't officially supported until 1.5 | ||
| serverVersion, err := clientset.Discovery().ServerVersion() | ||
| if err != nil { | ||
| return fmt.Errorf("Error getting server version: %v", err) | ||
| } | ||
|
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| // Create the provisioner: it implements the Provisioner interface expected by | ||
| // the controller | ||
| hostPathProvisioner := NewHostPathProvisioner() | ||
|
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| // Start the provision controller which will dynamically provision hostPath | ||
| // PVs | ||
| pc := controller.NewProvisionController(clientset, resyncPeriod, provisionerName, hostPathProvisioner, serverVersion.GitVersion, exponentialBackOffOnError, failedRetryThreshold, leasePeriod, renewDeadline, retryPeriod, termLimit) | ||
|
|
||
| pc.Run(wait.NeverStop) | ||
| return nil | ||
| } | ||
| } |
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