Sleep is not called in attachVolume, causing the function to check for status very frequently in short time

[vroad]

According to README of jpillora/backoff you should call time.Sleep manually to wait for calculated duration. b.Duration just calculates the time you need to wait.
But time.Sleep is never called.

etcd3-bootstrap/ebs.go

Lines 81 to 102 in 80311f3

	volumeDescs, err := svc.DescribeVolumes(&ec2.DescribeVolumesInput{
	VolumeIds: []*string{volume.VolumeId},
	})
	if err != nil {
	return errors.Wrap(err, "Error retrieving volume description status")
	}
	volumes := volumeDescs.Volumes
	if len(volumes) == 0 {
	continue
	}
	if len(volumes[0].Attachments) == 0 {
	continue
	}
	if *volumes[0].Attachments[0].State == ec2.VolumeAttachmentStateAttached {
	break
	}
	log.Printf("Waiting for attachment to complete. Current state: %s", *volumes[0].Attachments[0].State)
	b.Duration()

https://github.com/jpillora/backoff/blob/1.0.0/README.md#example-using-net-package

And even after fixing this, the problem still occurs with filesystem formatting.
If you try to format filesystem right after the status become attached, it fails because /dev/xvdf is not yet ready.
You should need to give enough amount of time for the device to be ready.

the file /dev/xvdf does not exist and no size was specified