Golang AWSCloud.AttachDisk Examples

Example #1

File: aws_util.go Project: iconoeugen/origin

// Attaches the specified persistent disk device to node, verifies that it is attached, and retries if it fails.
func attachDiskAndVerify(b *awsElasticBlockStoreBuilder, xvdBeforeSet sets.String) (string, error) {
	var awsCloud *aws.AWSCloud
	var attachError error

	for numRetries := 0; numRetries < maxRetries; numRetries++ {
		var err error
		if awsCloud == nil {
			awsCloud, err = getCloudProvider(b.awsElasticBlockStore.plugin)
			if err != nil || awsCloud == nil {
				// Retry on error. See issue #11321
				glog.Errorf("Error getting AWSCloudProvider while detaching PD %q: %v", b.volumeID, err)
				time.Sleep(errorSleepDuration)
				continue
			}
		}

		if numRetries > 0 {
			glog.Warningf("Retrying attach for EBS Disk %q (retry count=%v).", b.volumeID, numRetries)
		}

		var devicePath string
		devicePath, attachError = awsCloud.AttachDisk(b.volumeID, "", b.readOnly)
		if attachError != nil {
			glog.Errorf("Error attaching PD %q: %v", b.volumeID, attachError)
			time.Sleep(errorSleepDuration)
			continue
		}

		devicePaths := getDiskByIdPaths(b.awsElasticBlockStore, devicePath)

		for numChecks := 0; numChecks < maxChecks; numChecks++ {
			path, err := verifyDevicePath(devicePaths)
			if err != nil {
				// Log error, if any, and continue checking periodically. See issue #11321
				glog.Errorf("Error verifying EBS Disk (%q) is attached: %v", b.volumeID, err)
			} else if path != "" {
				// A device path has successfully been created for the PD
				glog.Infof("Successfully attached EBS Disk %q.", b.volumeID)
				return path, nil
			}

			// Sleep then check again
			glog.V(3).Infof("Waiting for EBS Disk %q to attach.", b.volumeID)
			time.Sleep(checkSleepDuration)
		}
	}

	if attachError != nil {
		return "", fmt.Errorf("Could not attach EBS Disk %q: %v", b.volumeID, attachError)
	}
	return "", fmt.Errorf("Could not attach EBS Disk %q. Timeout waiting for mount paths to be created.", b.volumeID)
}