0ee9160f88
Recycling is a long duration process and when the recycler controller is restarted in the meantime, it should not start a new recycler pod if there is one already running. This means that the recycler pod must have deterministic name based on name of the recycled PV, we then get name conflicts when creating the pod. Two things need to be changed: - recycler controller and recycler plugins must pass the PV.Name to place, where the pod is created. - create recycler pod with deterministic name and check "already exists" error. When at it, remove useless 'resourceVersion' argument and make log messages starting with lowercase.
299 lines
8.5 KiB
Go
299 lines
8.5 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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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 nfs
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import (
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"fmt"
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"os"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/types"
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"k8s.io/kubernetes/pkg/util/mount"
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"k8s.io/kubernetes/pkg/util/strings"
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"k8s.io/kubernetes/pkg/volume"
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"github.com/golang/glog"
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)
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// This is the primary entrypoint for volume plugins.
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// The volumeConfig arg provides the ability to configure recycler behavior. It is implemented as a pointer to allow nils.
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// The nfsPlugin is used to store the volumeConfig and give it, when needed, to the func that creates NFS Recyclers.
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// Tests that exercise recycling should not use this func but instead use ProbeRecyclablePlugins() to override default behavior.
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func ProbeVolumePlugins(volumeConfig volume.VolumeConfig) []volume.VolumePlugin {
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return []volume.VolumePlugin{
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&nfsPlugin{
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host: nil,
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newRecyclerFunc: newRecycler,
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config: volumeConfig,
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},
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}
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}
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type nfsPlugin struct {
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host volume.VolumeHost
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// decouple creating recyclers by deferring to a function. Allows for easier testing.
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newRecyclerFunc func(pvName string, spec *volume.Spec, host volume.VolumeHost, volumeConfig volume.VolumeConfig) (volume.Recycler, error)
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config volume.VolumeConfig
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}
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var _ volume.VolumePlugin = &nfsPlugin{}
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var _ volume.PersistentVolumePlugin = &nfsPlugin{}
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var _ volume.RecyclableVolumePlugin = &nfsPlugin{}
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const (
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nfsPluginName = "kubernetes.io/nfs"
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)
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func (plugin *nfsPlugin) Init(host volume.VolumeHost) error {
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plugin.host = host
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return nil
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}
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func (plugin *nfsPlugin) Name() string {
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return nfsPluginName
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}
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func (plugin *nfsPlugin) CanSupport(spec *volume.Spec) bool {
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return (spec.PersistentVolume != nil && spec.PersistentVolume.Spec.NFS != nil) ||
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(spec.Volume != nil && spec.Volume.NFS != nil)
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}
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func (plugin *nfsPlugin) GetAccessModes() []api.PersistentVolumeAccessMode {
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return []api.PersistentVolumeAccessMode{
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api.ReadWriteOnce,
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api.ReadOnlyMany,
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api.ReadWriteMany,
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}
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}
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func (plugin *nfsPlugin) NewMounter(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Mounter, error) {
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return plugin.newMounterInternal(spec, pod, plugin.host.GetMounter())
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}
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func (plugin *nfsPlugin) newMounterInternal(spec *volume.Spec, pod *api.Pod, mounter mount.Interface) (volume.Mounter, error) {
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var source *api.NFSVolumeSource
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var readOnly bool
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if spec.Volume != nil && spec.Volume.NFS != nil {
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source = spec.Volume.NFS
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readOnly = spec.Volume.NFS.ReadOnly
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} else {
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source = spec.PersistentVolume.Spec.NFS
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readOnly = spec.ReadOnly
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}
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return &nfsMounter{
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nfs: &nfs{
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volName: spec.Name(),
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mounter: mounter,
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pod: pod,
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plugin: plugin,
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},
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server: source.Server,
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exportPath: source.Path,
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readOnly: readOnly,
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}, nil
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}
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func (plugin *nfsPlugin) NewUnmounter(volName string, podUID types.UID) (volume.Unmounter, error) {
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return plugin.newUnmounterInternal(volName, podUID, plugin.host.GetMounter())
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}
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func (plugin *nfsPlugin) newUnmounterInternal(volName string, podUID types.UID, mounter mount.Interface) (volume.Unmounter, error) {
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return &nfsUnmounter{&nfs{
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volName: volName,
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mounter: mounter,
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pod: &api.Pod{ObjectMeta: api.ObjectMeta{UID: podUID}},
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plugin: plugin,
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}}, nil
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}
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func (plugin *nfsPlugin) NewRecycler(pvName string, spec *volume.Spec) (volume.Recycler, error) {
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return plugin.newRecyclerFunc(pvName, spec, plugin.host, plugin.config)
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}
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// NFS volumes represent a bare host file or directory mount of an NFS export.
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type nfs struct {
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volName string
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pod *api.Pod
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mounter mount.Interface
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plugin *nfsPlugin
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// decouple creating recyclers by deferring to a function. Allows for easier testing.
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newRecyclerFunc func(spec *volume.Spec, host volume.VolumeHost, volumeConfig volume.VolumeConfig) (volume.Recycler, error)
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volume.MetricsNil
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}
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func (nfsVolume *nfs) GetPath() string {
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name := nfsPluginName
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return nfsVolume.plugin.host.GetPodVolumeDir(nfsVolume.pod.UID, strings.EscapeQualifiedNameForDisk(name), nfsVolume.volName)
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}
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type nfsMounter struct {
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*nfs
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server string
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exportPath string
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readOnly bool
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}
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var _ volume.Mounter = &nfsMounter{}
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func (b *nfsMounter) GetAttributes() volume.Attributes {
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return volume.Attributes{
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ReadOnly: b.readOnly,
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Managed: false,
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SupportsSELinux: false,
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}
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}
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// SetUp attaches the disk and bind mounts to the volume path.
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func (b *nfsMounter) SetUp(fsGroup *int64) error {
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return b.SetUpAt(b.GetPath(), fsGroup)
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}
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func (b *nfsMounter) SetUpAt(dir string, fsGroup *int64) error {
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notMnt, err := b.mounter.IsLikelyNotMountPoint(dir)
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glog.V(4).Infof("NFS mount set up: %s %v %v", dir, !notMnt, err)
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if err != nil && !os.IsNotExist(err) {
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return err
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}
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if !notMnt {
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return nil
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}
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os.MkdirAll(dir, 0750)
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source := fmt.Sprintf("%s:%s", b.server, b.exportPath)
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options := []string{}
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if b.readOnly {
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options = append(options, "ro")
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}
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err = b.mounter.Mount(source, dir, "nfs", options)
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if err != nil {
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notMnt, mntErr := b.mounter.IsLikelyNotMountPoint(dir)
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if mntErr != nil {
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glog.Errorf("IsLikelyNotMountPoint check failed: %v", mntErr)
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return err
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}
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if !notMnt {
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if mntErr = b.mounter.Unmount(dir); mntErr != nil {
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glog.Errorf("Failed to unmount: %v", mntErr)
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return err
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}
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notMnt, mntErr := b.mounter.IsLikelyNotMountPoint(dir)
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if mntErr != nil {
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glog.Errorf("IsLikelyNotMountPoint check failed: %v", mntErr)
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return err
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}
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if !notMnt {
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// This is very odd, we don't expect it. We'll try again next sync loop.
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glog.Errorf("%s is still mounted, despite call to unmount(). Will try again next sync loop.", dir)
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return err
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}
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}
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os.Remove(dir)
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return err
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}
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return nil
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}
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//
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//func (c *nfsUnmounter) GetPath() string {
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// name := nfsPluginName
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// return c.plugin.host.GetPodVolumeDir(c.pod.UID, strings.EscapeQualifiedNameForDisk(name), c.volName)
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//}
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var _ volume.Unmounter = &nfsUnmounter{}
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type nfsUnmounter struct {
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*nfs
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}
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func (c *nfsUnmounter) TearDown() error {
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return c.TearDownAt(c.GetPath())
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}
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func (c *nfsUnmounter) TearDownAt(dir string) error {
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notMnt, err := c.mounter.IsLikelyNotMountPoint(dir)
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if err != nil {
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glog.Errorf("Error checking IsLikelyNotMountPoint: %v", err)
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return err
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}
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if notMnt {
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return os.Remove(dir)
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}
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if err := c.mounter.Unmount(dir); err != nil {
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glog.Errorf("Unmounting failed: %v", err)
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return err
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}
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notMnt, mntErr := c.mounter.IsLikelyNotMountPoint(dir)
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if mntErr != nil {
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glog.Errorf("IsLikelyNotMountPoint check failed: %v", mntErr)
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return mntErr
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}
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if notMnt {
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if err := os.Remove(dir); err != nil {
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return err
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}
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}
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return nil
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}
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func newRecycler(pvName string, spec *volume.Spec, host volume.VolumeHost, volumeConfig volume.VolumeConfig) (volume.Recycler, error) {
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if spec.PersistentVolume == nil || spec.PersistentVolume.Spec.NFS == nil {
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return nil, fmt.Errorf("spec.PersistentVolumeSource.NFS is nil")
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}
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return &nfsRecycler{
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name: spec.Name(),
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server: spec.PersistentVolume.Spec.NFS.Server,
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path: spec.PersistentVolume.Spec.NFS.Path,
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host: host,
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config: volumeConfig,
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timeout: volume.CalculateTimeoutForVolume(volumeConfig.RecyclerMinimumTimeout, volumeConfig.RecyclerTimeoutIncrement, spec.PersistentVolume),
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pvName: pvName,
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}, nil
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}
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// nfsRecycler scrubs an NFS volume by running "rm -rf" on the volume in a pod.
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type nfsRecycler struct {
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name string
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server string
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path string
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host volume.VolumeHost
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config volume.VolumeConfig
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timeout int64
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volume.MetricsNil
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pvName string
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}
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func (r *nfsRecycler) GetPath() string {
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return r.path
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}
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// Recycle recycles/scrubs clean an NFS volume.
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// Recycle blocks until the pod has completed or any error occurs.
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func (r *nfsRecycler) Recycle() error {
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pod := r.config.RecyclerPodTemplate
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// overrides
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pod.Spec.ActiveDeadlineSeconds = &r.timeout
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pod.GenerateName = "pv-recycler-nfs-"
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pod.Spec.Volumes[0].VolumeSource = api.VolumeSource{
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NFS: &api.NFSVolumeSource{
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Server: r.server,
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Path: r.path,
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},
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}
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return volume.RecycleVolumeByWatchingPodUntilCompletion(r.pvName, pod, r.host.GetKubeClient())
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}
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