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aws_ebs.go
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aws_ebs.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 aws_ebs
import (
"fmt"
"os"
"path"
"path/filepath"
"strconv"
"strings"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/resource"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/mount"
utilstrings "k8s.io/kubernetes/pkg/util/strings"
"k8s.io/kubernetes/pkg/volume"
)
// This is the primary entrypoint for volume plugins.
func ProbeVolumePlugins() []volume.VolumePlugin {
return []volume.VolumePlugin{&awsElasticBlockStorePlugin{nil}}
}
type awsElasticBlockStorePlugin struct {
host volume.VolumeHost
}
var _ volume.VolumePlugin = &awsElasticBlockStorePlugin{}
var _ volume.PersistentVolumePlugin = &awsElasticBlockStorePlugin{}
var _ volume.DeletableVolumePlugin = &awsElasticBlockStorePlugin{}
var _ volume.ProvisionableVolumePlugin = &awsElasticBlockStorePlugin{}
const (
awsElasticBlockStorePluginName = "kubernetes.io/aws-ebs"
)
func (plugin *awsElasticBlockStorePlugin) Init(host volume.VolumeHost) error {
plugin.host = host
return nil
}
func (plugin *awsElasticBlockStorePlugin) Name() string {
return awsElasticBlockStorePluginName
}
func (plugin *awsElasticBlockStorePlugin) CanSupport(spec *volume.Spec) bool {
return (spec.PersistentVolume != nil && spec.PersistentVolume.Spec.AWSElasticBlockStore != nil) ||
(spec.Volume != nil && spec.Volume.AWSElasticBlockStore != nil)
}
func (plugin *awsElasticBlockStorePlugin) GetAccessModes() []api.PersistentVolumeAccessMode {
return []api.PersistentVolumeAccessMode{
api.ReadWriteOnce,
}
}
func (plugin *awsElasticBlockStorePlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Builder, error) {
// Inject real implementations here, test through the internal function.
return plugin.newBuilderInternal(spec, pod.UID, &AWSDiskUtil{}, plugin.host.GetMounter())
}
func (plugin *awsElasticBlockStorePlugin) newBuilderInternal(spec *volume.Spec, podUID types.UID, manager ebsManager, mounter mount.Interface) (volume.Builder, error) {
// EBSs used directly in a pod have a ReadOnly flag set by the pod author.
// EBSs used as a PersistentVolume gets the ReadOnly flag indirectly through the persistent-claim volume used to mount the PV
var readOnly bool
var ebs *api.AWSElasticBlockStoreVolumeSource
if spec.Volume != nil && spec.Volume.AWSElasticBlockStore != nil {
ebs = spec.Volume.AWSElasticBlockStore
readOnly = ebs.ReadOnly
} else {
ebs = spec.PersistentVolume.Spec.AWSElasticBlockStore
readOnly = spec.ReadOnly
}
volumeID := ebs.VolumeID
fsType := ebs.FSType
partition := ""
if ebs.Partition != 0 {
partition = strconv.Itoa(ebs.Partition)
}
return &awsElasticBlockStoreBuilder{
awsElasticBlockStore: &awsElasticBlockStore{
podUID: podUID,
volName: spec.Name(),
volumeID: volumeID,
partition: partition,
manager: manager,
mounter: mounter,
plugin: plugin,
},
fsType: fsType,
readOnly: readOnly,
diskMounter: &mount.SafeFormatAndMount{plugin.host.GetMounter(), exec.New()}}, nil
}
func (plugin *awsElasticBlockStorePlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
// Inject real implementations here, test through the internal function.
return plugin.newCleanerInternal(volName, podUID, &AWSDiskUtil{}, plugin.host.GetMounter())
}
func (plugin *awsElasticBlockStorePlugin) newCleanerInternal(volName string, podUID types.UID, manager ebsManager, mounter mount.Interface) (volume.Cleaner, error) {
return &awsElasticBlockStoreCleaner{&awsElasticBlockStore{
podUID: podUID,
volName: volName,
manager: manager,
mounter: mounter,
plugin: plugin,
}}, nil
}
func (plugin *awsElasticBlockStorePlugin) NewDeleter(spec *volume.Spec) (volume.Deleter, error) {
return plugin.newDeleterInternal(spec, &AWSDiskUtil{})
}
func (plugin *awsElasticBlockStorePlugin) newDeleterInternal(spec *volume.Spec, manager ebsManager) (volume.Deleter, error) {
if spec.PersistentVolume != nil && spec.PersistentVolume.Spec.AWSElasticBlockStore == nil {
return nil, fmt.Errorf("spec.PersistentVolumeSource.AWSElasticBlockStore is nil")
}
return &awsElasticBlockStoreDeleter{
awsElasticBlockStore: &awsElasticBlockStore{
volName: spec.Name(),
volumeID: spec.PersistentVolume.Spec.AWSElasticBlockStore.VolumeID,
manager: manager,
plugin: plugin,
}}, nil
}
func (plugin *awsElasticBlockStorePlugin) NewProvisioner(options volume.VolumeOptions) (volume.Provisioner, error) {
if len(options.AccessModes) == 0 {
options.AccessModes = plugin.GetAccessModes()
}
return plugin.newProvisionerInternal(options, &AWSDiskUtil{})
}
func (plugin *awsElasticBlockStorePlugin) newProvisionerInternal(options volume.VolumeOptions, manager ebsManager) (volume.Provisioner, error) {
return &awsElasticBlockStoreProvisioner{
awsElasticBlockStore: &awsElasticBlockStore{
manager: manager,
plugin: plugin,
},
options: options,
}, nil
}
// Abstract interface to PD operations.
type ebsManager interface {
// Attaches the disk to the kubelet's host machine.
AttachAndMountDisk(b *awsElasticBlockStoreBuilder, globalPDPath string) error
// Detaches the disk from the kubelet's host machine.
DetachDisk(c *awsElasticBlockStoreCleaner) error
// Creates a volume
CreateVolume(provisioner *awsElasticBlockStoreProvisioner) (volumeID string, volumeSizeGB int, err error)
// Deletes a volume
DeleteVolume(deleter *awsElasticBlockStoreDeleter) error
}
// awsElasticBlockStore volumes are disk resources provided by Amazon Web Services
// that are attached to the kubelet's host machine and exposed to the pod.
type awsElasticBlockStore struct {
volName string
podUID types.UID
// Unique id of the PD, used to find the disk resource in the provider.
volumeID string
// Specifies the partition to mount
partition string
// Utility interface that provides API calls to the provider to attach/detach disks.
manager ebsManager
// Mounter interface that provides system calls to mount the global path to the pod local path.
mounter mount.Interface
plugin *awsElasticBlockStorePlugin
volume.MetricsNil
}
func detachDiskLogError(ebs *awsElasticBlockStore) {
err := ebs.manager.DetachDisk(&awsElasticBlockStoreCleaner{ebs})
if err != nil {
glog.Warningf("Failed to detach disk: %v (%v)", ebs, err)
}
}
type awsElasticBlockStoreBuilder struct {
*awsElasticBlockStore
// Filesystem type, optional.
fsType string
// Specifies whether the disk will be attached as read-only.
readOnly bool
// diskMounter provides the interface that is used to mount the actual block device.
diskMounter *mount.SafeFormatAndMount
}
var _ volume.Builder = &awsElasticBlockStoreBuilder{}
func (b *awsElasticBlockStoreBuilder) GetAttributes() volume.Attributes {
return volume.Attributes{
ReadOnly: b.readOnly,
Managed: !b.readOnly,
SupportsSELinux: true,
}
}
// SetUp attaches the disk and bind mounts to the volume path.
func (b *awsElasticBlockStoreBuilder) SetUp(fsGroup *int64) error {
return b.SetUpAt(b.GetPath(), fsGroup)
}
// SetUpAt attaches the disk and bind mounts to the volume path.
func (b *awsElasticBlockStoreBuilder) SetUpAt(dir string, fsGroup *int64) error {
// TODO: handle failed mounts here.
notMnt, err := b.mounter.IsLikelyNotMountPoint(dir)
glog.V(4).Infof("PersistentDisk set up: %s %v %v", dir, !notMnt, err)
if err != nil && !os.IsNotExist(err) {
return err
}
if !notMnt {
return nil
}
globalPDPath := makeGlobalPDPath(b.plugin.host, b.volumeID)
if err := b.manager.AttachAndMountDisk(b, globalPDPath); err != nil {
return err
}
if err := os.MkdirAll(dir, 0750); err != nil {
// TODO: we should really eject the attach/detach out into its own control loop.
detachDiskLogError(b.awsElasticBlockStore)
return err
}
// Perform a bind mount to the full path to allow duplicate mounts of the same PD.
options := []string{"bind"}
if b.readOnly {
options = append(options, "ro")
}
err = b.mounter.Mount(globalPDPath, dir, "", options)
if err != nil {
notMnt, mntErr := b.mounter.IsLikelyNotMountPoint(dir)
if mntErr != nil {
glog.Errorf("IsLikelyNotMountPoint check failed: %v", mntErr)
return err
}
if !notMnt {
if mntErr = b.mounter.Unmount(dir); mntErr != nil {
glog.Errorf("Failed to unmount: %v", mntErr)
return err
}
notMnt, mntErr := b.mounter.IsLikelyNotMountPoint(dir)
if mntErr != nil {
glog.Errorf("IsLikelyNotMountPoint check failed: %v", mntErr)
return err
}
if !notMnt {
// This is very odd, we don't expect it. We'll try again next sync loop.
glog.Errorf("%s is still mounted, despite call to unmount(). Will try again next sync loop.", dir)
return err
}
}
os.Remove(dir)
// TODO: we should really eject the attach/detach out into its own control loop.
detachDiskLogError(b.awsElasticBlockStore)
return err
}
if !b.readOnly {
volume.SetVolumeOwnership(b, fsGroup)
}
return nil
}
func makeGlobalPDPath(host volume.VolumeHost, volumeID string) string {
// Clean up the URI to be more fs-friendly
name := volumeID
name = strings.Replace(name, "://", "/", -1)
return path.Join(host.GetPluginDir(awsElasticBlockStorePluginName), "mounts", name)
}
// Reverses the mapping done in makeGlobalPDPath
func getVolumeIDFromGlobalMount(host volume.VolumeHost, globalPath string) (string, error) {
basePath := path.Join(host.GetPluginDir(awsElasticBlockStorePluginName), "mounts")
rel, err := filepath.Rel(basePath, globalPath)
if err != nil {
return "", err
}
if strings.Contains(rel, "../") {
return "", fmt.Errorf("Unexpected mount path: " + globalPath)
}
// Reverse the :// replacement done in makeGlobalPDPath
volumeID := rel
if strings.HasPrefix(volumeID, "aws/") {
volumeID = strings.Replace(volumeID, "aws/", "aws://", 1)
}
glog.V(2).Info("Mapping mount dir ", globalPath, " to volumeID ", volumeID)
return volumeID, nil
}
func (ebs *awsElasticBlockStore) GetPath() string {
name := awsElasticBlockStorePluginName
return ebs.plugin.host.GetPodVolumeDir(ebs.podUID, utilstrings.EscapeQualifiedNameForDisk(name), ebs.volName)
}
type awsElasticBlockStoreCleaner struct {
*awsElasticBlockStore
}
var _ volume.Cleaner = &awsElasticBlockStoreCleaner{}
// Unmounts the bind mount, and detaches the disk only if the PD
// resource was the last reference to that disk on the kubelet.
func (c *awsElasticBlockStoreCleaner) TearDown() error {
return c.TearDownAt(c.GetPath())
}
// Unmounts the bind mount, and detaches the disk only if the PD
// resource was the last reference to that disk on the kubelet.
func (c *awsElasticBlockStoreCleaner) TearDownAt(dir string) error {
notMnt, err := c.mounter.IsLikelyNotMountPoint(dir)
if err != nil {
glog.V(2).Info("Error checking if mountpoint ", dir, ": ", err)
return err
}
if notMnt {
glog.V(2).Info("Not mountpoint, deleting")
return os.Remove(dir)
}
refs, err := mount.GetMountRefs(c.mounter, dir)
if err != nil {
glog.V(2).Info("Error getting mountrefs for ", dir, ": ", err)
return err
}
if len(refs) == 0 {
glog.Warning("Did not find pod-mount for ", dir, " during tear-down")
}
// Unmount the bind-mount inside this pod
if err := c.mounter.Unmount(dir); err != nil {
glog.V(2).Info("Error unmounting dir ", dir, ": ", err)
return err
}
// If len(refs) is 1, then all bind mounts have been removed, and the
// remaining reference is the global mount. It is safe to detach.
if len(refs) == 1 {
// c.volumeID is not initially set for volume-cleaners, so set it here.
c.volumeID, err = getVolumeIDFromGlobalMount(c.plugin.host, refs[0])
if err != nil {
glog.V(2).Info("Could not determine volumeID from mountpoint ", refs[0], ": ", err)
return err
}
if err := c.manager.DetachDisk(&awsElasticBlockStoreCleaner{c.awsElasticBlockStore}); err != nil {
glog.V(2).Info("Error detaching disk ", c.volumeID, ": ", err)
return err
}
} else {
glog.V(2).Infof("Found multiple refs; won't detach EBS volume: %v", refs)
}
notMnt, mntErr := c.mounter.IsLikelyNotMountPoint(dir)
if mntErr != nil {
glog.Errorf("IsLikelyNotMountPoint check failed: %v", mntErr)
return err
}
if notMnt {
if err := os.Remove(dir); err != nil {
glog.V(2).Info("Error removing mountpoint ", dir, ": ", err)
return err
}
}
return nil
}
type awsElasticBlockStoreDeleter struct {
*awsElasticBlockStore
}
var _ volume.Deleter = &awsElasticBlockStoreDeleter{}
func (d *awsElasticBlockStoreDeleter) GetPath() string {
name := awsElasticBlockStorePluginName
return d.plugin.host.GetPodVolumeDir(d.podUID, utilstrings.EscapeQualifiedNameForDisk(name), d.volName)
}
func (d *awsElasticBlockStoreDeleter) Delete() error {
return d.manager.DeleteVolume(d)
}
type awsElasticBlockStoreProvisioner struct {
*awsElasticBlockStore
options volume.VolumeOptions
namespace string
}
var _ volume.Provisioner = &awsElasticBlockStoreProvisioner{}
func (c *awsElasticBlockStoreProvisioner) Provision(pv *api.PersistentVolume) error {
volumeID, sizeGB, err := c.manager.CreateVolume(c)
if err != nil {
return err
}
pv.Spec.PersistentVolumeSource.AWSElasticBlockStore.VolumeID = volumeID
pv.Spec.Capacity = api.ResourceList{
api.ResourceName(api.ResourceStorage): resource.MustParse(fmt.Sprintf("%dGi", sizeGB)),
}
return nil
}
func (c *awsElasticBlockStoreProvisioner) NewPersistentVolumeTemplate() (*api.PersistentVolume, error) {
// Provide dummy api.PersistentVolume.Spec, it will be filled in
// awsElasticBlockStoreProvisioner.Provision()
return &api.PersistentVolume{
ObjectMeta: api.ObjectMeta{
GenerateName: "pv-aws-",
Labels: map[string]string{},
Annotations: map[string]string{
"kubernetes.io/createdby": "aws-ebs-dynamic-provisioner",
},
},
Spec: api.PersistentVolumeSpec{
PersistentVolumeReclaimPolicy: c.options.PersistentVolumeReclaimPolicy,
AccessModes: c.options.AccessModes,
Capacity: api.ResourceList{
api.ResourceName(api.ResourceStorage): c.options.Capacity,
},
PersistentVolumeSource: api.PersistentVolumeSource{
AWSElasticBlockStore: &api.AWSElasticBlockStoreVolumeSource{
VolumeID: "dummy",
FSType: "ext4",
Partition: 0,
ReadOnly: false,
},
},
},
}, nil
}