ec2_snapshot question: how to run only when needed?

[Ted Zlatanov]

I'd like to snapshot EC2 volumes only when needed. I couldn't find an
easy solution that didn't require calling out to boto or other tools.
If it exists, please ignore the following :) I wanted to ask here
before opening a feature or pull request.

It could look like this:

- local_action:
module: ec2_snapshot
region: "{{ region }}"
instance_id: "{{ id }}"
device_name: "{{ device }}"
snapshot_tags:
SnapshotCreator: ansible
Host: "{{ server }}"
Device: "{{ device }}"
# new feature, using the snapshot_tags to determine current state
# currently it's "always"
state: present|absent|always

Does this make sense? Currently it's not available but could be
implemented in a backwards compatible way if the default state was
"always."

Thanks
Ted

[Ted Zlatanov]

On Thu, 23 Oct 2014 14:37:06 -0400 Ted Zlatanov <t...@lifelogs.com> wrote:

TZ> I'd like to snapshot EC2 volumes only when needed. I couldn't find an
TZ> easy solution that didn't require calling out to boto or other tools.
TZ> If it exists, please ignore the following :) I wanted to ask here
TZ> before opening a feature or pull request.

Alternate suggestion for this new behavior: copy the ec2 module's count
options. It would add these options to ec2_snapshot.py:

...
exact_count:
version_added: "1.8"
description:
- An integer value which indicates how many snapshots that match the 'count_tag' parameter should be present. Snapshots are either created or terminated based on this value.
required: false
default: null
aliases: []
count_tag:
version_added: "1.8"
description:
- Used with 'exact_count' to determine how many snapshots based on a specific tag criteria should be present.
required: false
default: null
aliases: []

So when `exact_count` is omitted, things work like they do now, but if
it's specified, an `enforce_count()` function will be called.

Ted

[Ted Zlatanov]

On Thu, 23 Oct 2014 15:03:22 -0400 Ted Zlatanov <t...@lifelogs.com> wrote:

TZ> On Thu, 23 Oct 2014 14:37:06 -0400 Ted Zlatanov <t...@lifelogs.com> wrote:
TZ> I'd like to snapshot EC2 volumes only when needed. I couldn't find an
TZ> easy solution that didn't require calling out to boto or other tools.
TZ> If it exists, please ignore the following :) I wanted to ask here
TZ> before opening a feature or pull request.

TZ> Alternate suggestion for this new behavior: copy the ec2 module's count
TZ> options. It would add these options to ec2_snapshot.py:
...

Final suggestion :)

boto has a nice `trim_snapshots()` method [1] that could simply be
called inline, given appropriate parameters from the ec2_snapshot
module. I could use that too, but it seems much less flexible than the
ec2 module's exact_count/count_tag approach.

Thanks!
Ted

[1] http://boto.readthedocs.org/en/latest/ref/ec2.html#boto.ec2.connection.EC2Connection.trim_snapshots

[Michael DeHaan]

Hi Ted,

We'd be happy to consider a pull request to ansible/ansible-modules-core

(We would like to avoid cluttering up the tracker with feature requests as usually folks are unlikely to scratch itches of others)

ansible-devel list is the right forum to discuss what form this maybe should take.

Thanks!

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