101602ab11
Gluster provisioner is interested in pvc.Namespace and I don't want to add at as a new field in VolumeOptions - it would contain almost whole PVC. Let's pass direct reference to PVC instead and let the provisioner to pick information it is interested in.
415 lines
12 KiB
Go
415 lines
12 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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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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//
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// utility functions to setup rbd volume
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// mainly implement diskManager interface
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//
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package rbd
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"math/rand"
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"os"
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"path"
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"regexp"
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"strings"
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"time"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/util/exec"
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"k8s.io/kubernetes/pkg/util/mount"
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"k8s.io/kubernetes/pkg/util/node"
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"k8s.io/kubernetes/pkg/volume"
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)
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const (
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imageWatcherStr = "watcher="
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)
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// search /sys/bus for rbd device that matches given pool and image
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func getDevFromImageAndPool(pool, image string) (string, bool) {
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// /sys/bus/rbd/devices/X/name and /sys/bus/rbd/devices/X/pool
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sys_path := "/sys/bus/rbd/devices"
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if dirs, err := ioutil.ReadDir(sys_path); err == nil {
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for _, f := range dirs {
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// pool and name format:
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// see rbd_pool_show() and rbd_name_show() at
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// https://github.com/torvalds/linux/blob/master/drivers/block/rbd.c
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name := f.Name()
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// first match pool, then match name
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po := path.Join(sys_path, name, "pool")
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img := path.Join(sys_path, name, "name")
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exe := exec.New()
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out, err := exe.Command("cat", po, img).CombinedOutput()
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if err != nil {
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continue
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}
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matched, err := regexp.MatchString("^"+pool+"\n"+image+"\n$", string(out))
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if err != nil || !matched {
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continue
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}
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// found a match, check if device exists
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devicePath := "/dev/rbd" + name
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if _, err := os.Lstat(devicePath); err == nil {
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return devicePath, true
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}
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}
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}
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return "", false
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}
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// stat a path, if not exists, retry maxRetries times
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func waitForPath(pool, image string, maxRetries int) (string, bool) {
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for i := 0; i < maxRetries; i++ {
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devicePath, found := getDevFromImageAndPool(pool, image)
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if found {
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return devicePath, true
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}
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time.Sleep(time.Second)
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}
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return "", false
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}
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// make a directory like /var/lib/kubelet/plugins/kubernetes.io/pod/rbd/pool-image-image
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func makePDNameInternal(host volume.VolumeHost, pool string, image string) string {
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return path.Join(host.GetPluginDir(rbdPluginName), "rbd", pool+"-image-"+image)
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}
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type RBDUtil struct{}
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func (util *RBDUtil) MakeGlobalPDName(rbd rbd) string {
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return makePDNameInternal(rbd.plugin.host, rbd.Pool, rbd.Image)
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}
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func (util *RBDUtil) rbdLock(b rbdMounter, lock bool) error {
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var err error
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var output, locker string
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var cmd []byte
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var secret_opt []string
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if b.Secret != "" {
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secret_opt = []string{"--key=" + b.Secret}
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} else {
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secret_opt = []string{"-k", b.Keyring}
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}
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// construct lock id using host name and a magic prefix
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lock_id := "kubelet_lock_magic_" + node.GetHostname("")
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l := len(b.Mon)
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// avoid mount storm, pick a host randomly
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start := rand.Int() % l
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// iterate all hosts until mount succeeds.
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for i := start; i < start+l; i++ {
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mon := b.Mon[i%l]
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// cmd "rbd lock list" serves two purposes:
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// for fencing, check if lock already held for this host
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// this edge case happens if host crashes in the middle of acquiring lock and mounting rbd
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// for defencing, get the locker name, something like "client.1234"
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cmd, err = b.plugin.execCommand("rbd",
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append([]string{"lock", "list", b.Image, "--pool", b.Pool, "--id", b.Id, "-m", mon}, secret_opt...))
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output = string(cmd)
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if err != nil {
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continue
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}
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if lock {
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// check if lock is already held for this host by matching lock_id and rbd lock id
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if strings.Contains(output, lock_id) {
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// this host already holds the lock, exit
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glog.V(1).Infof("rbd: lock already held for %s", lock_id)
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return nil
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}
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// hold a lock: rbd lock add
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cmd, err = b.plugin.execCommand("rbd",
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append([]string{"lock", "add", b.Image, lock_id, "--pool", b.Pool, "--id", b.Id, "-m", mon}, secret_opt...))
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} else {
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// defencing, find locker name
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ind := strings.LastIndex(output, lock_id) - 1
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for i := ind; i >= 0; i-- {
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if output[i] == '\n' {
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locker = output[(i + 1):ind]
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break
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}
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}
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// remove a lock: rbd lock remove
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cmd, err = b.plugin.execCommand("rbd",
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append([]string{"lock", "remove", b.Image, lock_id, locker, "--pool", b.Pool, "--id", b.Id, "-m", mon}, secret_opt...))
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}
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if err == nil {
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//lock is acquired
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break
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}
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}
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return err
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}
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func (util *RBDUtil) persistRBD(rbd rbdMounter, mnt string) error {
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file := path.Join(mnt, "rbd.json")
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fp, err := os.Create(file)
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if err != nil {
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return fmt.Errorf("rbd: create err %s/%s", file, err)
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}
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defer fp.Close()
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encoder := json.NewEncoder(fp)
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if err = encoder.Encode(rbd); err != nil {
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return fmt.Errorf("rbd: encode err: %v.", err)
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}
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return nil
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}
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func (util *RBDUtil) loadRBD(mounter *rbdMounter, mnt string) error {
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file := path.Join(mnt, "rbd.json")
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fp, err := os.Open(file)
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if err != nil {
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return fmt.Errorf("rbd: open err %s/%s", file, err)
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}
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defer fp.Close()
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decoder := json.NewDecoder(fp)
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if err = decoder.Decode(mounter); err != nil {
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return fmt.Errorf("rbd: decode err: %v.", err)
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}
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return nil
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}
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func (util *RBDUtil) fencing(b rbdMounter) error {
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// no need to fence readOnly
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if (&b).GetAttributes().ReadOnly {
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return nil
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}
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return util.rbdLock(b, true)
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}
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func (util *RBDUtil) defencing(c rbdUnmounter) error {
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// no need to fence readOnly
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if c.ReadOnly {
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return nil
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}
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return util.rbdLock(*c.rbdMounter, false)
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}
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func (util *RBDUtil) AttachDisk(b rbdMounter) error {
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var err error
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var output []byte
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devicePath, found := waitForPath(b.Pool, b.Image, 1)
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if !found {
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// modprobe
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_, err = b.plugin.execCommand("modprobe", []string{"rbd"})
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if err != nil {
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return fmt.Errorf("rbd: failed to modprobe rbd error:%v", err)
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}
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// rbd map
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l := len(b.Mon)
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// avoid mount storm, pick a host randomly
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start := rand.Int() % l
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// iterate all hosts until mount succeeds.
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for i := start; i < start+l; i++ {
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mon := b.Mon[i%l]
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glog.V(1).Infof("rbd: map mon %s", mon)
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if b.Secret != "" {
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output, err = b.plugin.execCommand("rbd",
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[]string{"map", b.Image, "--pool", b.Pool, "--id", b.Id, "-m", mon, "--key=" + b.Secret})
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} else {
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output, err = b.plugin.execCommand("rbd",
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[]string{"map", b.Image, "--pool", b.Pool, "--id", b.Id, "-m", mon, "-k", b.Keyring})
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}
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if err == nil {
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break
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}
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glog.V(1).Infof("rbd: map error %v %s", err, string(output))
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}
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if err != nil {
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return fmt.Errorf("rbd: map failed %v %s", err, string(output))
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}
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devicePath, found = waitForPath(b.Pool, b.Image, 10)
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if !found {
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return errors.New("Could not map image: Timeout after 10s")
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}
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}
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// mount it
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globalPDPath := b.manager.MakeGlobalPDName(*b.rbd)
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notMnt, err := b.mounter.IsLikelyNotMountPoint(globalPDPath)
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// in the first time, the path shouldn't exist and IsLikelyNotMountPoint is expected to get NotExist
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if err != nil && !os.IsNotExist(err) {
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return fmt.Errorf("rbd: %s failed to check mountpoint", globalPDPath)
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}
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if !notMnt {
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return nil
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}
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if err := os.MkdirAll(globalPDPath, 0750); err != nil {
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return fmt.Errorf("rbd: failed to mkdir %s, error", globalPDPath)
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}
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// fence off other mappers
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if err := util.fencing(b); err != nil {
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// rbd unmap before exit
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b.plugin.execCommand("rbd", []string{"unmap", devicePath})
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return fmt.Errorf("rbd: image %s is locked by other nodes", b.Image)
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}
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// rbd lock remove needs ceph and image config
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// but kubelet doesn't get them from apiserver during teardown
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// so persit rbd config so upon disk detach, rbd lock can be removed
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// since rbd json is persisted in the same local directory that is used as rbd mountpoint later,
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// the json file remains invisible during rbd mount and thus won't be removed accidentally.
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util.persistRBD(b, globalPDPath)
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if err = b.mounter.FormatAndMount(devicePath, globalPDPath, b.fsType, nil); err != nil {
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err = fmt.Errorf("rbd: failed to mount rbd volume %s [%s] to %s, error %v", devicePath, b.fsType, globalPDPath, err)
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}
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return err
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}
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func (util *RBDUtil) DetachDisk(c rbdUnmounter, mntPath string) error {
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device, cnt, err := mount.GetDeviceNameFromMount(c.mounter, mntPath)
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if err != nil {
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return fmt.Errorf("rbd detach disk: failed to get device from mnt: %s\nError: %v", mntPath, err)
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}
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if err = c.mounter.Unmount(mntPath); err != nil {
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return fmt.Errorf("rbd detach disk: failed to umount: %s\nError: %v", mntPath, err)
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}
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// if device is no longer used, see if can unmap
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if cnt <= 1 {
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// rbd unmap
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_, err = c.plugin.execCommand("rbd", []string{"unmap", device})
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if err != nil {
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return fmt.Errorf("rbd: failed to unmap device %s:Error: %v", device, err)
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}
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// load ceph and image/pool info to remove fencing
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if err := util.loadRBD(c.rbdMounter, mntPath); err == nil {
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// remove rbd lock
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util.defencing(c)
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}
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glog.Infof("rbd: successfully unmap device %s", device)
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}
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return nil
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}
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func (util *RBDUtil) CreateImage(p *rbdVolumeProvisioner) (r *api.RBDVolumeSource, size int, err error) {
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capacity := p.options.PVC.Spec.Resources.Requests[api.ResourceName(api.ResourceStorage)]
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volSizeBytes := capacity.Value()
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// convert to MB that rbd defaults on
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sz := int(volume.RoundUpSize(volSizeBytes, 1024*1024))
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volSz := fmt.Sprintf("%d", sz)
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// rbd create
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l := len(p.rbdMounter.Mon)
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// pick a mon randomly
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start := rand.Int() % l
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// iterate all monitors until create succeeds.
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for i := start; i < start+l; i++ {
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mon := p.Mon[i%l]
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glog.V(4).Infof("rbd: create %s size %s using mon %s, pool %s id %s key %s", p.rbdMounter.Image, volSz, mon, p.rbdMounter.Pool, p.rbdMounter.adminId, p.rbdMounter.adminSecret)
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var output []byte
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output, err = p.rbdMounter.plugin.execCommand("rbd",
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[]string{"create", p.rbdMounter.Image, "--size", volSz, "--pool", p.rbdMounter.Pool, "--id", p.rbdMounter.adminId, "-m", mon, "--key=" + p.rbdMounter.adminSecret, "--image-format", "1"})
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if err == nil {
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break
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} else {
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glog.Warningf("failed to create rbd image, output %v", string(output))
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}
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}
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if err != nil {
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glog.Errorf("rbd: Error creating rbd image: %v", err)
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return nil, 0, err
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}
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return &api.RBDVolumeSource{
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CephMonitors: p.rbdMounter.Mon,
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RBDImage: p.rbdMounter.Image,
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RBDPool: p.rbdMounter.Pool,
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}, sz, nil
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}
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func (util *RBDUtil) DeleteImage(p *rbdVolumeDeleter) error {
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var output []byte
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found, err := util.rbdStatus(p.rbdMounter)
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if err != nil {
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return err
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}
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if found {
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glog.Info("rbd is still being used ", p.rbdMounter.Image)
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return fmt.Errorf("rbd %s is still being used", p.rbdMounter.Image)
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}
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// rbd rm
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l := len(p.rbdMounter.Mon)
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// pick a mon randomly
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start := rand.Int() % l
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// iterate all monitors until rm succeeds.
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for i := start; i < start+l; i++ {
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mon := p.rbdMounter.Mon[i%l]
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glog.V(4).Infof("rbd: rm %s using mon %s, pool %s id %s key %s", p.rbdMounter.Image, mon, p.rbdMounter.Pool, p.rbdMounter.adminId, p.rbdMounter.adminSecret)
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output, err = p.plugin.execCommand("rbd",
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[]string{"rm", p.rbdMounter.Image, "--pool", p.rbdMounter.Pool, "--id", p.rbdMounter.adminId, "-m", mon, "--key=" + p.rbdMounter.adminSecret})
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if err == nil {
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return nil
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} else {
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glog.Errorf("failed to delete rbd image, error %v output %v", err, string(output))
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}
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}
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return err
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}
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// run rbd status command to check if there is watcher on the image
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func (util *RBDUtil) rbdStatus(b *rbdMounter) (bool, error) {
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var err error
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var output string
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var cmd []byte
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l := len(b.Mon)
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start := rand.Int() % l
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// iterate all hosts until mount succeeds.
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for i := start; i < start+l; i++ {
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mon := b.Mon[i%l]
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// cmd "rbd status" list the rbd client watch with the following output:
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// Watchers:
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// watcher=10.16.153.105:0/710245699 client.14163 cookie=1
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glog.V(4).Infof("rbd: status %s using mon %s, pool %s id %s key %s", b.Image, mon, b.Pool, b.adminId, b.adminSecret)
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cmd, err = b.plugin.execCommand("rbd",
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[]string{"status", b.Image, "--pool", b.Pool, "-m", mon, "--id", b.adminId, "--key=" + b.adminSecret})
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output = string(cmd)
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if err != nil {
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// ignore error code, just checkout output for watcher string
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glog.Warningf("failed to execute rbd status on mon %s", mon)
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}
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if strings.Contains(output, imageWatcherStr) {
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glog.V(4).Infof("rbd: watchers on %s: %s", b.Image, output)
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return true, nil
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} else {
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glog.Warningf("rbd: no watchers on %s", b.Image)
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return false, nil
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}
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}
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return false, nil
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}
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