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openstack: cache InstanceID and use it for volume management. 

Hostnames are not related to server names or instance IDs in any way,
don't use them when attaching/detaching volumes.
pull/6/head
Jan Safranek 2015-11-12 11:10:38 +01:00
parent e49f0de95b
commit 7fc8bcae60
1 changed files with 96 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

154
pkg/cloudprovider/providers/openstack/openstack.go
View File

@ -17,12 +17,13 @@ limitations under the License.
package openstack
import (
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
ossys "os"
"regexp"
"strings"
"time"
@ -48,6 +49,12 @@ import (
const ProviderName = "openstack"
// metadataUrl is URL to OpenStack metadata server. It's hadrcoded IPv4
// link-local address as documented in "OpenStack Cloud Administrator Guide",
// chapter Compute - Networking with nova-network.
// http://docs.openstack.org/admin-guide-cloud/compute-networking-nova.html#metadata-service
const metadataUrl = "http://169.254.169.254/openstack/2012-08-10/meta_data.json"
var ErrNotFound = errors.New("Failed to find object")
var ErrMultipleResults = errors.New("Multiple results where only one expected")
var ErrNoAddressFound = errors.New("No address found for host")
@ -86,6 +93,8 @@ type OpenStack struct {
provider *gophercloud.ProviderClient
region string
lbOpts LoadBalancerOpts
// InstanceID of the server where this OpenStack object is instantiated.
localInstanceID string
}
type Config struct {
@ -140,17 +149,89 @@ func readConfig(config io.Reader) (Config, error) {
return cfg, err
}
// parseMetadataUUID reads JSON from OpenStack metadata server and parses
// instance ID out of it.
func parseMetadataUUID(jsonData []byte) (string, error) {
// We should receive an object with { 'uuid': '<uuid>' } and couple of other
// properties (which we ignore).
obj := struct{ UUID string }{}
err := json.Unmarshal(jsonData, &obj)
if err != nil {
return "", err
}
uuid := obj.UUID
if uuid == "" {
err = fmt.Errorf("cannot parse OpenStack metadata, got empty uuid")
return "", err
}
return uuid, nil
}
func readInstanceID() (string, error) {
// Try to find instance ID on the local filesystem (created by cloud-init)
const instanceIDFile = "/var/lib/cloud/data/instance-id"
idBytes, err := ioutil.ReadFile(instanceIDFile)
if err == nil {
instanceID := string(idBytes)
instanceID = strings.TrimSpace(instanceID)
glog.V(3).Infof("Got instance id from %s: %s", instanceIDFile, instanceID)
if instanceID != "" {
return instanceID, nil
}
// Fall through with empty instanceID and try metadata server.
}
glog.V(5).Infof("Cannot read %s: '%v', trying metadata server", instanceIDFile, err)
// Try to get JSON from metdata server.
resp, err := http.Get(metadataUrl)
if err != nil {
glog.V(3).Infof("Cannot read %s: %v", metadataUrl, err)
return "", err
}
if resp.StatusCode != 200 {
err = fmt.Errorf("got unexpected status code when reading metadata from %s: %s", metadataUrl, resp.Status)
glog.V(3).Infof("%v", err)
return "", err
}
defer resp.Body.Close()
bodyBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
glog.V(3).Infof("Cannot get HTTP response body from %s: %v", metadataUrl, err)
return "", err
}
instanceID, err := parseMetadataUUID(bodyBytes)
if err != nil {
glog.V(3).Infof("Cannot parse instance ID from metadata from %s: %v", metadataUrl, err)
return "", err
}
glog.V(3).Infof("Got instance id from %s: %s", metadataUrl, instanceID)
return instanceID, nil
}
func newOpenStack(cfg Config) (*OpenStack, error) {
provider, err := openstack.AuthenticatedClient(cfg.toAuthOptions())
if err != nil {
return nil, err
}
id, err := readInstanceID()
if err != nil {
return nil, err
}
os := OpenStack{
provider: provider,
region: cfg.Global.Region,
lbOpts: cfg.LoadBalancer,
localInstanceID: id,
}
return &os, nil
}
@ -786,15 +867,10 @@ func (os *OpenStack) AttachDisk(diskName string) (string, error) {
glog.Errorf("Unable to initialize nova client for region: %s", os.region)
return "", err
}
compute_id, err := os.getComputeIDbyHostname(cClient)
if err != nil || len(compute_id) == 0 {
glog.Errorf("Unable to get minion's id by minion's hostname")
return "", err
}
if len(disk.Attachments) > 0 && disk.Attachments[0]["server_id"] != nil {
if compute_id == disk.Attachments[0]["server_id"] {
glog.V(4).Infof("Disk: %q is already attached to compute: %q", diskName, compute_id)
if os.localInstanceID == disk.Attachments[0]["server_id"] {
glog.V(4).Infof("Disk: %q is already attached to compute: %q", diskName, os.localInstanceID)
return disk.ID, nil
} else {
errMsg := fmt.Sprintf("Disk %q is attached to a different compute: %q, should be detached before proceeding", diskName, disk.Attachments[0]["server_id"])
@ -803,14 +879,14 @@ func (os *OpenStack) AttachDisk(diskName string) (string, error) {
}
}
// add read only flag here if possible spothanis
_, err = volumeattach.Create(cClient, compute_id, &volumeattach.CreateOpts{
_, err = volumeattach.Create(cClient, os.localInstanceID, &volumeattach.CreateOpts{
VolumeID: disk.ID,
}).Extract()
if err != nil {
glog.Errorf("Failed to attach %s volume to %s compute", diskName, compute_id)
glog.Errorf("Failed to attach %s volume to %s compute", diskName, os.localInstanceID)
return "", err
}
glog.V(2).Infof("Successfully attached %s volume to %s compute", diskName, compute_id)
glog.V(2).Infof("Successfully attached %s volume to %s compute", diskName, os.localInstanceID)
return disk.ID, nil
}
@ -827,22 +903,17 @@ func (os *OpenStack) DetachDisk(partialDiskId string) error {
glog.Errorf("Unable to initialize nova client for region: %s", os.region)
return err
}
compute_id, err := os.getComputeIDbyHostname(cClient)
if err != nil || len(compute_id) == 0 {
glog.Errorf("Unable to get compute id while detaching disk")
return err
}
if len(disk.Attachments) > 0 && disk.Attachments[0]["server_id"] != nil && compute_id == disk.Attachments[0]["server_id"] {
if len(disk.Attachments) > 0 && disk.Attachments[0]["server_id"] != nil && os.localInstanceID == disk.Attachments[0]["server_id"] {
// This is a blocking call and effects kubelet's performance directly.
// We should consider kicking it out into a separate routine, if it is bad.
err = volumeattach.Delete(cClient, compute_id, disk.ID).ExtractErr()
err = volumeattach.Delete(cClient, os.localInstanceID, disk.ID).ExtractErr()
if err != nil {
glog.Errorf("Failed to delete volume %s from compute %s attached %v", disk.ID, compute_id, err)
glog.Errorf("Failed to delete volume %s from compute %s attached %v", disk.ID, os.localInstanceID, err)
return err
}
glog.V(2).Infof("Successfully detached volume: %s from compute: %s", disk.ID, compute_id)
glog.V(2).Infof("Successfully detached volume: %s from compute: %s", disk.ID, os.localInstanceID)
} else {
errMsg := fmt.Sprintf("Disk: %s has no attachments or is not attached to compute: %s", disk.Name, compute_id)
errMsg := fmt.Sprintf("Disk: %s has no attachments or is not attached to compute: %s", disk.Name, os.localInstanceID)
glog.Errorf(errMsg)
return errors.New(errMsg)
}
@ -885,44 +956,3 @@ func (os *OpenStack) getVolume(diskName string) (volumes.Volume, error) {
}
return volume, err
}
func (os *OpenStack) getComputeIDbyHostname(cClient *gophercloud.ServiceClient) (string, error) {
hostname, err := ossys.Hostname()
if err != nil {
glog.Errorf("Failed to get Minion's hostname: %v", err)
return "", err
}
i, ok := os.Instances()
if !ok {
glog.Errorf("Unable to get instances")
return "", errors.New("Unable to get instances")
}
srvs, err := i.List(".")
if err != nil {
glog.Errorf("Failed to list servers: %v", err)
return "", err
}
if len(srvs) == 0 {
glog.Errorf("Found no servers in the region")
return "", errors.New("Found no servers in the region")
}
glog.V(4).Infof("Found servers: %v", srvs)
for _, srvname := range srvs {
server, err := getServerByName(cClient, srvname)
if err != nil {
return "", err
} else {
if (server.Metadata["hostname"] != nil && server.Metadata["hostname"] == hostname) || (len(server.Name) > 0 && server.Name == hostname) {
glog.V(4).Infof("Found server: %s with host :%s", server.Name, hostname)
return server.ID, nil
}
}
}
return "", fmt.Errorf("No server found matching hostname: %s", hostname)
}