I would use group_by to create a dynamic group first in a prior play, like
so:
- hosts: webservers
tasks:
- group_by: name=webserver-{{ city | default('no_city') }}
And then you could use, in the template, replace the groupname 'webserver'
with 'webserver-amsterdam' like so:
groups['webserver-amsterdam'][0]
to select the first one.
Others may prefer deep Jinja2 magic, but I'd find that more readable. You
can also use the dynamic group for other types of management in Ansible:
- hosts: webservers-amsterdam
tasks:
- yum: name=foo state=latest
etc
On Wed, Jul 30, 2014 at 8:06 AM, Piet83 <[email protected]> wrote:
> Thank you Michael for the right syntax :)
>
> Is it also possible to select one host in the goup array based on a city
> defined as variable for a particular host? In other words, I don't know on
> what position in the array the servername is I need. I only know it is in
> group databaseserver and that it has amterdam defined as variable city.
>
> By the way if I try this in a template:
>
> {{ hostvars[groups['databaseserver'][0]].ansible_eth0.ipv4.address }}
>
>
>
> I get the following error running a playbook with the above in a template:
> fatal: [localhost] => {'msg': "One or more undefined variables: 'dict'
> object has no attribute 'ansible_eth0'", 'failed': True}
> fatal: [localhost] => {'msg': "One or more undefined variables: 'dict'
> object has no attribute 'ansible_eth0'", 'failed': True}
>
> FATAL: all hosts have already failed -- aborting
>
>
>
>
>
>
>
> Op dinsdag 29 juli 2014 17:07:57 UTC+2 schreef Michael DeHaan:
>>
>> The above imaginary syntax will not work, but this will :) The groups
>> array contains the names of each host in each group, and this picks out the
>> first one in inventory order.
>>
>> {{ hostvars[groups['databaseserver'][0]].ansible_eth0.ipv4.address }}
>>
>> If using a template file versus inline in the playbook, I'd do this:
>>
>> {# set db_head_node = groups['databaseserver'][0] #}
>> {{ hostvars[db_head_node].blarg }}
>>
>> for readability purposes
>>
>>
>>
>>
>> On Tue, Jul 29, 2014 at 11:02 AM, Piet83 <[email protected]> wrote:
>>
>>> Ok but what if I don't know the server name but only that it is an
>>> database server in amsterdam?
>>>
>>> Something like this, but then with the right syntax?
>>>
>>> {{ groups["databaseserver"] | {{ hostvars["amsterdam"] }} | {{
>>> ansible_eth0.ipv4.address }} }}
>>>
>>> Op dinsdag 29 juli 2014 14:23:04 UTC+2 schreef Brian Coca:
>>>
>>>> just do {{ city }}, if it is the 'current host', to access vars of
>>>> other hosts {{ hostvars['server3'].city }}
>>>>
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