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rbd.go
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rbd.go
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/*
Copyright 2014 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 rbd
import (
"fmt"
"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{&rbdPlugin{nil, exec.New()}}
}
type rbdPlugin struct {
host volume.VolumeHost
exe exec.Interface
}
var _ volume.VolumePlugin = &rbdPlugin{}
var _ volume.PersistentVolumePlugin = &rbdPlugin{}
const (
rbdPluginName = "kubernetes.io/rbd"
)
func (plugin *rbdPlugin) Init(host volume.VolumeHost) {
plugin.host = host
}
func (plugin *rbdPlugin) Name() string {
return rbdPluginName
}
func (plugin *rbdPlugin) CanSupport(spec *volume.Spec) bool {
if (spec.Volume != nil && spec.Volume.RBD == nil) || (spec.PersistentVolume != nil && spec.PersistentVolume.Spec.RBD == nil) {
return false
}
// see if rbd is there
_, err := plugin.execCommand("rbd", []string{"-h"})
if err == nil {
return true
}
return false
}
func (plugin *rbdPlugin) GetAccessModes() []api.PersistentVolumeAccessMode {
return []api.PersistentVolumeAccessMode{
api.ReadWriteOnce,
api.ReadOnlyMany,
}
}
func (plugin *rbdPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Builder, error) {
secret := ""
source, _ := plugin.getRBDVolumeSource(spec)
if source.SecretRef != nil {
kubeClient := plugin.host.GetKubeClient()
if kubeClient == nil {
return nil, fmt.Errorf("Cannot get kube client")
}
secretName, err := kubeClient.Secrets(pod.Namespace).Get(source.SecretRef.Name)
if err != nil {
glog.Errorf("Couldn't get secret %v/%v", pod.Namespace, source.SecretRef)
return nil, err
}
for name, data := range secretName.Data {
secret = string(data)
glog.V(1).Infof("ceph secret info: %s/%s", name, secret)
}
}
// Inject real implementations here, test through the internal function.
return plugin.newBuilderInternal(spec, pod.UID, &RBDUtil{}, plugin.host.GetMounter(), secret)
}
func (plugin *rbdPlugin) getRBDVolumeSource(spec *volume.Spec) (*api.RBDVolumeSource, bool) {
// rbd volumes used directly in a pod have a ReadOnly flag set by the pod author.
// rbd 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.RBD != nil {
return spec.Volume.RBD, spec.Volume.RBD.ReadOnly
} else {
return spec.PersistentVolume.Spec.RBD, spec.ReadOnly
}
}
func (plugin *rbdPlugin) newBuilderInternal(spec *volume.Spec, podUID types.UID, manager diskManager, mounter mount.Interface, secret string) (volume.Builder, error) {
source, readOnly := plugin.getRBDVolumeSource(spec)
pool := source.RBDPool
if pool == "" {
pool = "rbd"
}
id := source.RadosUser
if id == "" {
id = "admin"
}
keyring := source.Keyring
if keyring == "" {
keyring = "/etc/ceph/keyring"
}
return &rbdBuilder{
rbd: &rbd{
podUID: podUID,
volName: spec.Name(),
Image: source.RBDImage,
Pool: pool,
ReadOnly: readOnly,
manager: manager,
mounter: &mount.SafeFormatAndMount{mounter, exec.New()},
plugin: plugin,
},
Mon: source.CephMonitors,
Id: id,
Keyring: keyring,
Secret: secret,
fsType: source.FSType,
}, nil
}
func (plugin *rbdPlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
// Inject real implementations here, test through the internal function.
return plugin.newCleanerInternal(volName, podUID, &RBDUtil{}, plugin.host.GetMounter())
}
func (plugin *rbdPlugin) newCleanerInternal(volName string, podUID types.UID, manager diskManager, mounter mount.Interface) (volume.Cleaner, error) {
return &rbdCleaner{
rbdBuilder: &rbdBuilder{
rbd: &rbd{
podUID: podUID,
volName: volName,
manager: manager,
mounter: mounter,
plugin: plugin,
},
Mon: make([]string, 0),
},
}, nil
}
type rbd struct {
volName string
podUID types.UID
Pool string
Image string
ReadOnly bool
plugin *rbdPlugin
mounter mount.Interface
// Utility interface that provides API calls to the provider to attach/detach disks.
manager diskManager
}
func (rbd *rbd) GetPath() string {
name := rbdPluginName
// safe to use PodVolumeDir now: volume teardown occurs before pod is cleaned up
return rbd.plugin.host.GetPodVolumeDir(rbd.podUID, util.EscapeQualifiedNameForDisk(name), rbd.volName)
}
type rbdBuilder struct {
*rbd
// capitalized so they can be exported in persistRBD()
Mon []string
Id string
Keyring string
Secret string
fsType string
}
var _ volume.Builder = &rbdBuilder{}
func (b *rbdBuilder) SetUp() error {
return b.SetUpAt(b.GetPath())
}
func (b *rbdBuilder) SetUpAt(dir string) error {
// diskSetUp checks mountpoints and prevent repeated calls
err := diskSetUp(b.manager, *b, dir, b.mounter)
if err != nil {
glog.Errorf("rbd: failed to setup")
return err
}
globalPDPath := b.manager.MakeGlobalPDName(*b.rbd)
// make mountpoint rw/ro work as expected
//FIXME revisit pkg/util/mount and ensure rw/ro is implemented as expected
mode := "rw"
if b.ReadOnly {
mode = "ro"
}
b.plugin.execCommand("mount", []string{"-o", "remount," + mode, globalPDPath, dir})
return nil
}
type rbdCleaner struct {
*rbdBuilder
}
var _ volume.Cleaner = &rbdCleaner{}
func (b *rbd) IsReadOnly() bool {
return b.ReadOnly
}
// Unmounts the bind mount, and detaches the disk only if the disk
// resource was the last reference to that disk on the kubelet.
func (c *rbdCleaner) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *rbdCleaner) TearDownAt(dir string) error {
return diskTearDown(c.manager, *c, dir, c.mounter)
}
func (plugin *rbdPlugin) execCommand(command string, args []string) ([]byte, error) {
cmd := plugin.exe.Command(command, args...)
return cmd.CombinedOutput()
}