volume_tags on instance (sometimes) clobbers attached EBS volume tags

[gavD]

Terraform Version

0.9.8

### Description

I use volume_tags on an EC2 instance to set my boot volume's tags. However, for my mounted volumes, I want slightly different tags (I use MakeSnapshot: True so a custom tool makes a snapshots ONLY of the mounted volume)

Expected Behavior

MakeSnapshot: True is set on the mounted volume

Actual Behavior

Terraform SOMETIMES does what I want and SOMETIMES stripes the MakeSnapshot tag. Here's the plan output:

~ module.basic2.aws_instance.database.0
    volume_tags.%:            "10" => "9"
    volume_tags.MakeSnapshot: "True" => ""

Steps to Reproduce

Here's an example terraform config with the irrelevant parts stripped out.

resource "aws_instance" "database" {

   # ...various config here...

  root_block_device {
    volume_type = "gp2"
  }

  tags {
    Name           =  "myinstance"
  }

  # I only want these on the boot volume
  volume_tags {
    Name           = "myinstance-bootVolume"
  }
}

resource "aws_ebs_volume" "database" {

  # ... various config here...

  type              = "gp2"

  tags {
    Name           = "myinstance-dataVolume"
    MakeSnapshot   = "True"
  }
}

resource "aws_volume_attachment" "database" {
  # ... various config here ...
}

then run terraform plan

Important Factoids

• Running in EC2 VPCs
• Sometimes it will strip the tag from the data, sometimes it will not

References

• aws_instance volume_tags wants to remove tags from aws_attached_volume volumes #14019

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