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Succeed creating aws_volume_attachment if identical attachment exists (#11060) 

If an `aws_volume_attachment` is identical to one that already exists in
the API, don't attempt to re-create it (which fails), simply act as
though the creation command had already been run and continue.

This allows Terraform to cleanly recover from a situation where a volume
attachment action hangs indefinitely, possibly due to a bad instance
state, requiring manual intervention such as an instance reboot. In such
a situation, Terraform believes the attachment has failed, when in fact
it succeeded after the timeout had expired. On the subsequent retry run,
attempting to re-create the attachment will fail outright, due to the
AttachVolume API call being non-idempotent. This patch implements the
idempotency client-side by matching the (name, vID, iID) tuple.

Note that volume attachments are not assigned an ID by the API.
This commit is contained in:
Doug Neal 2017-02-01 15:41:53 +00:00 committed by Paul Stack
parent c83a971efb
commit babc52202c
1 changed files with 31 additions and 11 deletions
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42
builtin/providers/aws/resource_aws_volume_attachment.go
View File

@ -59,20 +59,40 @@ func resourceAwsVolumeAttachmentCreate(d *schema.ResourceData, meta interface{})
iID := d.Get("instance_id").(string) iID := d.Get("instance_id").(string)
vID := d.Get("volume_id").(string) vID := d.Get("volume_id").(string)
opts := &ec2.AttachVolumeInput{ // Find out if the volume is already attached to the instance, in which case
Device: aws.String(name), // we have nothing to do
InstanceId: aws.String(iID), request := &ec2.DescribeVolumesInput{
VolumeId: aws.String(vID), VolumeIds: []*string{aws.String(vID)},
Filters: []*ec2.Filter{
&ec2.Filter{
Name: aws.String("attachment.instance-id"),
Values: []*string{aws.String(iID)},
},
&ec2.Filter{
Name: aws.String("attachment.device"),
Values: []*string{aws.String(name)},
},
},
} }
log.Printf("[DEBUG] Attaching Volume (%s) to Instance (%s)", vID, iID) vols, err := conn.DescribeVolumes(request)
_, err := conn.AttachVolume(opts) if (err != nil) || (len(vols.Volumes) == 0) {
if err != nil { // not attached
if awsErr, ok := err.(awserr.Error); ok { opts := &ec2.AttachVolumeInput{
return fmt.Errorf("[WARN] Error attaching volume (%s) to instance (%s), message: \"%s\", code: \"%s\"", Device: aws.String(name),
vID, iID, awsErr.Message(), awsErr.Code()) InstanceId: aws.String(iID),
VolumeId: aws.String(vID),
}
log.Printf("[DEBUG] Attaching Volume (%s) to Instance (%s)", vID, iID)
_, err := conn.AttachVolume(opts)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
return fmt.Errorf("[WARN] Error attaching volume (%s) to instance (%s), message: \"%s\", code: \"%s\"",
vID, iID, awsErr.Message(), awsErr.Code())
}
return err
} }
return err
} }
stateConf := &resource.StateChangeConf{ stateConf := &resource.StateChangeConf{