I was just looking into how I might implement this and there's an interesting
side effect of ec2_vol if a volume is already attached
Assuming you run ec2 and register the result as ec2, the following works:
- name: get root volume
action:
module: ec2_vol
instance: "{{ec2.instances[0].id}}"
device_name: '/dev/sda1'
region: ap-southeast-2
volume_size: 1
register: ec2_vol
(note that volume_size doesn't matter, it's ignored but the module fails
without it - with an error message that can only be described as unhelpful!)
You get as a result:
ok: [127.0.0.1] => {"changed": false, "device": "/dev/sda1", "msg": "Volume
mapping for /dev/sda1 already exists on instance i-834ab5bd", "volume_id":
"vol-92cee996"}
And so you can use ec2_vol.volume_id as a resource id to pass to ec2_tag.
Will
On 14 Apr 2014, at 20:25, Christian Kaps <[email protected]> wrote:
> Hi Will,
>
> Thanks for your answer.
>
> I would like to create a tag for the root volume. So for my use case the ec2
> module should return the IDs and the device names of the attached volumes
> after instance creation.
>
> Should I create a future request and point to this thread?
>
> Thanks,
> Christian
>
> Am Sonntag, 13. April 2014 03:00:08 UTC+2 schrieb Will Thames:
> Had a quick look at this in more detail.
>
> Neither the ec2 nor the ec2_facts module expose this information. It is
> available but in particular adding it to ec2_facts module would require
> fundamental changes (as currently the ec2_facts module gets all of its
> information from logging onto the box and reading the metadata, whereas this
> information would only be available through talking to the API - see
> http://stackoverflow.com/questions/5251057/using-boto-to-find-to-which-device-and-ebs-volume-is-mounted).
> I'm not adverse to such a change but making it optional and non-breaking for
> other users of the module is probably the challenge.
>
> Returning the value from the ec2 module is probably quite straightforward, on
> the other hand.
>
> Will
>
> On 13 Apr 2014, at 10:14, Will Thames <[email protected]> wrote:
>
>> Hi Christian,
>> How would you like to obtain the information - at instance creation time or
>> at an arbitrary point in time later? (i.e. do you want to be able to get the
>> instance ID as a value returned by the ec2 module, or from ec2_facts?)
>>
>> Will
>>
>> On Friday, April 11, 2014 7:59:09 PM UTC+10, Christian Kaps wrote:
>> Hi,
>>
>> is there any possibility to get the id of the root EBS volume of a newly
>> created EC2 instance? I cannot find any documentation about it?
>>
>> Thanks,
>> Christian
>>
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