Terraform crash when setting root_block_device attribute while launching new instance

[ranjitshinde91]

Hi, I am wriintig script to launh instance in aws. Below is the template:

resource "aws_instance" "demoInstance" {
    ami = "${lookup(var.amis, "demoInstance")}"
    instance_type = "t2.micro"
    key_name ="my-key"
    subnet_id="${aws_subnet.PublicSubnet1.id}"
    source_dest_check = "false"
    root_block_device = ["default"]
    security_groups = ["${aws_security_group.jumpboxSG.id}"]
    tags {
        Name = "jumpbox"
    }
}

When i run terrrafom plan, it gets crashed. Can you please tell me how to change root block device attributes?

Below are the crash.log file contents:

EDIT by @catsby, formatting and moved crash log to gist: https://gist.github.com/catsby/ac27d20ef561c713f73d

[catsby]

Hello @ranjitshinde91 – root_block_device expects a block of configuration. The details of which are outlined here:

• https://terraform.io/docs/providers/aws/r/instance.html#block-devices

And explained in AWS Documentation ion Block Device Mapping:

• http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html

An example would be like this:

  root_block_device = {
    device_name = "/dev/xvdj"
    volume_size = "200"
    delete_on_termination = false
    volume_type = "gp2"
  }

All that said, if you're looking for simply the "default", I think it's safe to omit the root_block_device entirely in your example.

Hope that helps!

[catsby]

@phinze Anything we can do here so this kind of thing (string used instead of a map) should error, not crash?

[phinze]

Yeah the fact that it crashes is definitely a bug. We can leave this open until we address.

[ranjitshinde91]

@catsby : Thanks this works !

[catsby]

@radeksimko great to hear! Let us know if there's anything else. Until then, we'll leave this open until we can address the underlying bug that causes a crash instead of an error.

Thanks for writing in!

[radeksimko]

@catsby you meant @ranjitshinde91 I guess? :smiley:

[catsby]

@radeksimko haha, yes, sorry! :smile:

[ghost]

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