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glusterfs.go
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glusterfs.go
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/*
Copyright 2015 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 glusterfs
import (
"os"
"path"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/volume"
)
// This is the primary entrypoint for volume plugins.
func ProbeVolumePlugins() []volume.VolumePlugin {
return []volume.VolumePlugin{&glusterfsPlugin{nil}}
}
type glusterfsPlugin struct {
host volume.VolumeHost
}
var _ volume.VolumePlugin = &glusterfsPlugin{}
var _ volume.PersistentVolumePlugin = &glusterfsPlugin{}
const (
glusterfsPluginName = "kubernetes.io/glusterfs"
)
func (plugin *glusterfsPlugin) Init(host volume.VolumeHost) {
plugin.host = host
}
func (plugin *glusterfsPlugin) Name() string {
return glusterfsPluginName
}
func (plugin *glusterfsPlugin) CanSupport(spec *volume.Spec) bool {
return (spec.PersistentVolume != nil && spec.PersistentVolume.Spec.Glusterfs != nil) ||
(spec.Volume != nil && spec.Volume.Glusterfs != nil)
}
func (plugin *glusterfsPlugin) GetAccessModes() []api.PersistentVolumeAccessMode {
return []api.PersistentVolumeAccessMode{
api.ReadWriteOnce,
api.ReadOnlyMany,
api.ReadWriteMany,
}
}
func (plugin *glusterfsPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Builder, error) {
source, _ := plugin.getGlusterVolumeSource(spec)
ep_name := source.EndpointsName
ns := pod.Namespace
ep, err := plugin.host.GetKubeClient().Endpoints(ns).Get(ep_name)
if err != nil {
glog.Errorf("Glusterfs: failed to get endpoints %s[%v]", ep_name, err)
return nil, err
}
glog.V(1).Infof("Glusterfs: endpoints %v", ep)
return plugin.newBuilderInternal(spec, ep, pod, plugin.host.GetMounter(), exec.New())
}
func (plugin *glusterfsPlugin) getGlusterVolumeSource(spec *volume.Spec) (*api.GlusterfsVolumeSource, bool) {
// Glusterfs volumes used directly in a pod have a ReadOnly flag set by the pod author.
// Glusterfs volumes used as a PersistentVolume gets the ReadOnly flag indirectly through the persistent-claim volume used to mount the PV
if spec.Volume != nil && spec.Volume.Glusterfs != nil {
return spec.Volume.Glusterfs, spec.Volume.Glusterfs.ReadOnly
} else {
return spec.PersistentVolume.Spec.Glusterfs, spec.ReadOnly
}
}
func (plugin *glusterfsPlugin) newBuilderInternal(spec *volume.Spec, ep *api.Endpoints, pod *api.Pod, mounter mount.Interface, exe exec.Interface) (volume.Builder, error) {
source, readOnly := plugin.getGlusterVolumeSource(spec)
return &glusterfsBuilder{
glusterfs: &glusterfs{
volName: spec.Name(),
mounter: mounter,
pod: pod,
plugin: plugin,
},
hosts: ep,
path: source.Path,
readOnly: readOnly,
exe: exe}, nil
}
func (plugin *glusterfsPlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
return plugin.newCleanerInternal(volName, podUID, plugin.host.GetMounter())
}
func (plugin *glusterfsPlugin) newCleanerInternal(volName string, podUID types.UID, mounter mount.Interface) (volume.Cleaner, error) {
return &glusterfsCleaner{&glusterfs{
volName: volName,
mounter: mounter,
pod: &api.Pod{ObjectMeta: api.ObjectMeta{UID: podUID}},
plugin: plugin,
}}, nil
}
// Glusterfs volumes represent a bare host file or directory mount of an Glusterfs export.
type glusterfs struct {
volName string
pod *api.Pod
mounter mount.Interface
plugin *glusterfsPlugin
}
type glusterfsBuilder struct {
*glusterfs
hosts *api.Endpoints
path string
readOnly bool
exe exec.Interface
}
var _ volume.Builder = &glusterfsBuilder{}
// SetUp attaches the disk and bind mounts to the volume path.
func (b *glusterfsBuilder) SetUp() error {
return b.SetUpAt(b.GetPath())
}
func (b *glusterfsBuilder) SetUpAt(dir string) error {
notMnt, err := b.mounter.IsLikelyNotMountPoint(dir)
glog.V(4).Infof("Glusterfs: mount set up: %s %v %v", dir, !notMnt, err)
if err != nil && !os.IsNotExist(err) {
return err
}
if !notMnt {
return nil
}
os.MkdirAll(dir, 0750)
err = b.setUpAtInternal(dir)
if err == nil {
return nil
}
// Cleanup upon failure.
c := &glusterfsCleaner{b.glusterfs}
c.cleanup(dir)
return err
}
func (b *glusterfsBuilder) IsReadOnly() bool {
return b.readOnly
}
func (glusterfsVolume *glusterfs) GetPath() string {
name := glusterfsPluginName
return glusterfsVolume.plugin.host.GetPodVolumeDir(glusterfsVolume.pod.UID, util.EscapeQualifiedNameForDisk(name), glusterfsVolume.volName)
}
type glusterfsCleaner struct {
*glusterfs
}
var _ volume.Cleaner = &glusterfsCleaner{}
func (c *glusterfsCleaner) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *glusterfsCleaner) TearDownAt(dir string) error {
return c.cleanup(dir)
}
func (c *glusterfsCleaner) cleanup(dir string) error {
notMnt, err := c.mounter.IsLikelyNotMountPoint(dir)
if err != nil {
glog.Errorf("Glusterfs: Error checking IsLikelyNotMountPoint: %v", err)
return err
}
if notMnt {
return os.RemoveAll(dir)
}
if err := c.mounter.Unmount(dir); err != nil {
glog.Errorf("Glusterfs: Unmounting failed: %v", err)
return err
}
notMnt, mntErr := c.mounter.IsLikelyNotMountPoint(dir)
if mntErr != nil {
glog.Errorf("Glusterfs: IsLikelyNotMountPoint check failed: %v", mntErr)
return mntErr
}
if notMnt {
if err := os.RemoveAll(dir); err != nil {
return err
}
}
return nil
}
func (b *glusterfsBuilder) setUpAtInternal(dir string) error {
var errs error
options := []string{}
if b.readOnly {
options = append(options, "ro")
}
p := path.Join(b.glusterfs.plugin.host.GetPluginDir(glusterfsPluginName), b.glusterfs.volName)
if err := os.MkdirAll(p, 0750); err != nil {
return err
}
log := path.Join(p, "glusterfs.log")
options = append(options, "log-file="+log)
addr := make(map[string]struct{})
for _, s := range b.hosts.Subsets {
for _, a := range s.Addresses {
addr[a.IP] = struct{}{}
}
}
// Avoid mount storm, pick a host randomly.
// Iterate all hosts until mount succeeds.
for hostIP := range addr {
errs = b.mounter.Mount(hostIP+":"+b.path, dir, "glusterfs", options)
if errs == nil {
return nil
}
}
glog.Errorf("Glusterfs: mount failed: %v", errs)
return errs
}