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rbd.go
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rbd.go
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/*
Copyright 2014 The Kubernetes Authors.
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"
dstrings "strings"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/resource"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/util/strings"
"k8s.io/kubernetes/pkg/util/uuid"
"k8s.io/kubernetes/pkg/volume"
volutil "k8s.io/kubernetes/pkg/volume/util"
)
// 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{}
var _ volume.DeletableVolumePlugin = &rbdPlugin{}
var _ volume.ProvisionableVolumePlugin = &rbdPlugin{}
const (
rbdPluginName = "kubernetes.io/rbd"
annCephAdminID = "rbd.kubernetes.io/admin"
annCephAdminSecretName = "rbd.kubernetes.io/adminsecretname"
annCephAdminSecretNameSpace = "rbd.kubernetes.io/adminsecretnamespace"
secretKeyName = "key" // key name used in secret
)
func (plugin *rbdPlugin) Init(host volume.VolumeHost) error {
plugin.host = host
return nil
}
func (plugin *rbdPlugin) GetPluginName() string {
return rbdPluginName
}
func (plugin *rbdPlugin) GetVolumeName(spec *volume.Spec) (string, error) {
volumeSource, _, err := getVolumeSource(spec)
if err != nil {
return "", err
}
return fmt.Sprintf(
"%v:%v",
volumeSource.CephMonitors,
volumeSource.RBDImage), nil
}
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
}
return true
}
func (plugin *rbdPlugin) RequiresRemount() bool {
return false
}
func (plugin *rbdPlugin) GetAccessModes() []api.PersistentVolumeAccessMode {
return []api.PersistentVolumeAccessMode{
api.ReadWriteOnce,
api.ReadOnlyMany,
}
}
func (plugin *rbdPlugin) NewMounter(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Mounter, error) {
var secret string
var err error
source, _ := plugin.getRBDVolumeSource(spec)
if source.SecretRef != nil {
if secret, err = parseSecret(pod.Namespace, source.SecretRef.Name, plugin.host.GetKubeClient()); err != nil {
glog.Errorf("Couldn't get secret from %v/%v", pod.Namespace, source.SecretRef)
return nil, err
}
}
// Inject real implementations here, test through the internal function.
return plugin.newMounterInternal(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) newMounterInternal(spec *volume.Spec, podUID types.UID, manager diskManager, mounter mount.Interface, secret string) (volume.Mounter, error) {
source, readOnly := plugin.getRBDVolumeSource(spec)
pool := source.RBDPool
id := source.RadosUser
keyring := source.Keyring
return &rbdMounter{
rbd: &rbd{
podUID: podUID,
volName: spec.Name(),
Image: source.RBDImage,
Pool: pool,
ReadOnly: readOnly,
manager: manager,
mounter: &mount.SafeFormatAndMount{Interface: mounter, Runner: exec.New()},
plugin: plugin,
},
Mon: source.CephMonitors,
Id: id,
Keyring: keyring,
Secret: secret,
fsType: source.FSType,
}, nil
}
func (plugin *rbdPlugin) NewUnmounter(volName string, podUID types.UID) (volume.Unmounter, error) {
// Inject real implementations here, test through the internal function.
return plugin.newUnmounterInternal(volName, podUID, &RBDUtil{}, plugin.host.GetMounter())
}
func (plugin *rbdPlugin) newUnmounterInternal(volName string, podUID types.UID, manager diskManager, mounter mount.Interface) (volume.Unmounter, error) {
return &rbdUnmounter{
rbdMounter: &rbdMounter{
rbd: &rbd{
podUID: podUID,
volName: volName,
manager: manager,
mounter: &mount.SafeFormatAndMount{Interface: mounter, Runner: exec.New()},
plugin: plugin,
},
Mon: make([]string, 0),
},
}, nil
}
func (plugin *rbdPlugin) ConstructVolumeSpec(volumeName, mountPath string) (*volume.Spec, error) {
rbdVolume := &api.Volume{
Name: volumeName,
VolumeSource: api.VolumeSource{
RBD: &api.RBDVolumeSource{
CephMonitors: []string{},
},
},
}
return volume.NewSpecFromVolume(rbdVolume), nil
}
func (plugin *rbdPlugin) NewDeleter(spec *volume.Spec) (volume.Deleter, error) {
if spec.PersistentVolume != nil && spec.PersistentVolume.Spec.RBD == nil {
return nil, fmt.Errorf("spec.PersistentVolumeSource.Spec.RBD is nil")
}
admin, adminSecretName, adminSecretNamespace, err := annotationsToParam(spec.PersistentVolume)
if err != nil {
return nil, fmt.Errorf("cannot find Ceph credentials to delete rbd PV: %v", err)
}
secret, err := parseSecret(adminSecretNamespace, adminSecretName, plugin.host.GetKubeClient())
if err != nil {
// log error but don't return yet
glog.Errorf("failed to get admin secret from [%q/%q]: %v", adminSecretNamespace, adminSecretName, err)
}
return plugin.newDeleterInternal(spec, admin, secret, &RBDUtil{})
}
func (plugin *rbdPlugin) newDeleterInternal(spec *volume.Spec, admin, secret string, manager diskManager) (volume.Deleter, error) {
return &rbdVolumeDeleter{
rbdMounter: &rbdMounter{
rbd: &rbd{
volName: spec.Name(),
Image: spec.PersistentVolume.Spec.RBD.RBDImage,
Pool: spec.PersistentVolume.Spec.RBD.RBDPool,
manager: manager,
plugin: plugin,
},
Mon: spec.PersistentVolume.Spec.RBD.CephMonitors,
adminId: admin,
adminSecret: secret,
}}, nil
}
func (plugin *rbdPlugin) NewProvisioner(options volume.VolumeOptions) (volume.Provisioner, error) {
if len(options.AccessModes) == 0 {
options.AccessModes = plugin.GetAccessModes()
}
return plugin.newProvisionerInternal(options, &RBDUtil{})
}
func (plugin *rbdPlugin) newProvisionerInternal(options volume.VolumeOptions, manager diskManager) (volume.Provisioner, error) {
return &rbdVolumeProvisioner{
rbdMounter: &rbdMounter{
rbd: &rbd{
manager: manager,
plugin: plugin,
},
},
options: options,
}, nil
}
type rbdVolumeProvisioner struct {
*rbdMounter
options volume.VolumeOptions
}
func (r *rbdVolumeProvisioner) Provision() (*api.PersistentVolume, error) {
if r.options.Selector != nil {
return nil, fmt.Errorf("claim Selector is not supported")
}
var err error
adminSecretName := ""
adminSecretNamespace := "default"
secretName := ""
secret := ""
for k, v := range r.options.Parameters {
switch dstrings.ToLower(k) {
case "monitors":
arr := dstrings.Split(v, ",")
for _, m := range arr {
r.Mon = append(r.Mon, m)
}
case "adminid":
r.adminId = v
case "adminsecretname":
adminSecretName = v
case "adminsecretnamespace":
adminSecretNamespace = v
case "userid":
r.Id = v
case "pool":
r.Pool = v
case "usersecretname":
secretName = v
default:
return nil, fmt.Errorf("invalid option %q for volume plugin %s", k, r.plugin.GetPluginName())
}
}
// sanity check
if adminSecretName == "" {
return nil, fmt.Errorf("missing Ceph admin secret name")
}
if secret, err = parseSecret(adminSecretNamespace, adminSecretName, r.plugin.host.GetKubeClient()); err != nil {
// log error but don't return yet
glog.Errorf("failed to get admin secret from [%q/%q]", adminSecretNamespace, adminSecretName)
}
r.adminSecret = secret
if len(r.Mon) < 1 {
return nil, fmt.Errorf("missing Ceph monitors")
}
if secretName == "" {
return nil, fmt.Errorf("missing user secret name")
}
if r.adminId == "" {
r.adminId = "admin"
}
if r.Pool == "" {
r.Pool = "rbd"
}
if r.Id == "" {
r.Id = r.adminId
}
// create random image name
image := fmt.Sprintf("kubernetes-dynamic-pvc-%s", uuid.NewUUID())
r.rbdMounter.Image = image
rbd, sizeMB, err := r.manager.CreateImage(r)
if err != nil {
glog.Errorf("rbd: create volume failed, err: %v", err)
return nil, fmt.Errorf("rbd: create volume failed, err: %v", err)
}
glog.Infof("successfully created rbd image %q", image)
pv := new(api.PersistentVolume)
rbd.SecretRef = new(api.LocalObjectReference)
rbd.SecretRef.Name = secretName
rbd.RadosUser = r.Id
pv.Spec.PersistentVolumeSource.RBD = rbd
pv.Spec.PersistentVolumeReclaimPolicy = r.options.PersistentVolumeReclaimPolicy
pv.Spec.AccessModes = r.options.AccessModes
pv.Spec.Capacity = api.ResourceList{
api.ResourceName(api.ResourceStorage): resource.MustParse(fmt.Sprintf("%dMi", sizeMB)),
}
// place parameters in pv selector
paramToAnnotations(r.adminId, adminSecretNamespace, adminSecretName, pv)
return pv, nil
}
type rbdVolumeDeleter struct {
*rbdMounter
}
func (r *rbdVolumeDeleter) GetPath() string {
name := rbdPluginName
return r.plugin.host.GetPodVolumeDir(r.podUID, strings.EscapeQualifiedNameForDisk(name), r.volName)
}
func (r *rbdVolumeDeleter) Delete() error {
return r.manager.DeleteImage(r)
}
func paramToAnnotations(admin, adminSecretNamespace, adminSecretName string, pv *api.PersistentVolume) {
if pv.Annotations == nil {
pv.Annotations = make(map[string]string)
}
pv.Annotations[annCephAdminID] = admin
pv.Annotations[annCephAdminSecretName] = adminSecretName
pv.Annotations[annCephAdminSecretNameSpace] = adminSecretNamespace
}
func annotationsToParam(pv *api.PersistentVolume) (string, string, string, error) {
if pv.Annotations == nil {
return "", "", "", fmt.Errorf("PV has no annotation, cannot get Ceph admin credentials")
}
var admin, adminSecretName, adminSecretNamespace string
found := false
admin, found = pv.Annotations[annCephAdminID]
if !found {
return "", "", "", fmt.Errorf("Cannot get Ceph admin id from PV annotations")
}
adminSecretName, found = pv.Annotations[annCephAdminSecretName]
if !found {
return "", "", "", fmt.Errorf("Cannot get Ceph admin secret from PV annotations")
}
adminSecretNamespace, found = pv.Annotations[annCephAdminSecretNameSpace]
if !found {
return "", "", "", fmt.Errorf("Cannot get Ceph admin secret namespace from PV annotations")
}
return admin, adminSecretName, adminSecretNamespace, nil
}
type rbd struct {
volName string
podUID types.UID
Pool string
Image string
ReadOnly bool
plugin *rbdPlugin
mounter *mount.SafeFormatAndMount
// Utility interface that provides API calls to the provider to attach/detach disks.
manager diskManager
volume.MetricsNil
}
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, strings.EscapeQualifiedNameForDisk(name), rbd.volName)
}
type rbdMounter struct {
*rbd
// capitalized so they can be exported in persistRBD()
Mon []string
Id string
Keyring string
Secret string
fsType string
adminSecret string
adminId string
}
var _ volume.Mounter = &rbdMounter{}
func (b *rbd) GetAttributes() volume.Attributes {
return volume.Attributes{
ReadOnly: b.ReadOnly,
Managed: !b.ReadOnly,
SupportsSELinux: true,
}
}
func (b *rbdMounter) SetUp(fsGroup *int64) error {
return b.SetUpAt(b.GetPath(), fsGroup)
}
func (b *rbdMounter) SetUpAt(dir string, fsGroup *int64) error {
// diskSetUp checks mountpoints and prevent repeated calls
glog.V(4).Infof("rbd: attempting to SetUp and mount %s", dir)
err := diskSetUp(b.manager, *b, dir, b.mounter, fsGroup)
if err != nil {
glog.Errorf("rbd: failed to setup mount %s %v", dir, err)
}
return err
}
type rbdUnmounter struct {
*rbdMounter
}
var _ volume.Unmounter = &rbdUnmounter{}
// 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 *rbdUnmounter) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *rbdUnmounter) 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()
}
func getVolumeSource(
spec *volume.Spec) (*api.RBDVolumeSource, bool, error) {
if spec.Volume != nil && spec.Volume.RBD != nil {
return spec.Volume.RBD, spec.Volume.RBD.ReadOnly, nil
} else if spec.PersistentVolume != nil &&
spec.PersistentVolume.Spec.RBD != nil {
return spec.PersistentVolume.Spec.RBD, spec.ReadOnly, nil
}
return nil, false, fmt.Errorf("Spec does not reference a RBD volume type")
}
// parseSecretMap locates the secret by key name.
func parseSecret(namespace, secretName string, kubeClient clientset.Interface) (string, error) {
secretMap, err := volutil.GetSecret(namespace, secretName, kubeClient)
if err != nil {
glog.Errorf("failed to get secret from [%q/%q]", namespace, secretName)
return "", fmt.Errorf("failed to get secret from [%q/%q]", namespace, secretName)
}
if len(secretMap) == 0 {
return "", fmt.Errorf("empty secret map")
}
secret := ""
for k, v := range secretMap {
if k == secretKeyName {
return v, nil
}
secret = v
}
// If not found, the last secret in the map wins as done before
return secret, nil
}