> In option #1, when --host is call you only return that one host and it's
host variables, if any.
So - I'm logging how my dynamic inventory script is called. When I run the
following: ansible-playbook -i dynamic_inventory/get_hosts test.yaml -e
"group=mygroup"
get_hosts is first called with --list
I tried putting some vars in the list output under _meta.hostvars. I was
wondering if that would stop Ansible querying get_hosts with --host for
every single group. However it stops it calling --host for *any* group so
I'm back to outputting all vars for all groups.
I can't seem to find a way to only need to generate vars for a single group
(or host).
One thought - I'm currently using a separate group for each host as that
seemed to simplest way to do handle my particular requirements (I'm only
ever running a playbook against a single host). You can see above I'm
conflating 'host' and 'group' somewhat.
Is this part of the problem or is that unrelated?
Is this part of the problem or is that unrelated?
On Wednesday, 12 August 2015 00:38:33 UTC+1, Timothy Appnel wrote:
>
> Yes you have. In option #1, when --host is call you only return that one
> host and it's host variables, if any. (You said a single group.) You don't
> return any groups or group variables.
>
> The dynamic inventory plugin API is a coarse-grained one that slurps in
> everything it can get from the inventory source. There are many reasons for
> that such as tasks that reference other host resources not targeted by the
> play.
>
>
> [image: photo]
> Timothy Appnel
> Senior Solutions Architect
>
> Ansible, Inc. *•* www.ansible.com
>
> On Tue, Aug 11, 2015 at 12:21 PM, Andy Baker <[email protected]
> <javascript:>> wrote:
>
>> This passage:
>> http://docs.ansible.com/ansible/developing_inventory.html#tuning-the-external-inventory-script
>>
>> seems to say you have two options:
>>
>> 1. Return a list of groups when called with --list and then return all
>> the vars for a single group when called with --host
>> 2. Return all groups and all vars in one go when called with --list (the
>> 'tuned' version)
>>
>> However in both cases you're forced to generate all groups and all vars.
>>
>> If I'm running a command on a single host or group - I rather expected
>> there would be a way to avoid generating the vars for all the groups or
>> hosts that I have no intention of connecting to.
>>
>> Have I misunderstood something?
>>
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