Sorry for necro'ing an old thread, but I'm having a similar problem: I'm
playing with an EC2 inventory, and I have several "environments", with
machines in these environments having a specific "class". Is there a way
to template the ip of the machine that has both 'tag_environment_myenv' and
'tag_class_database'?
On Friday, July 12, 2013 11:33:35 AM UTC-7, Michael DeHaan wrote:
>
> I would be inclined to do this in inventory:
>
> [core:children]
> core-cluster1
> core-cluster2
>
> [core-cluster1]
> asdf.example.com
> bar.example.com
>
> [core-cluster2]
> baz.example.com
> glorp.example.com
>
> Then you can just specify "core-cluster2" as the group name.
>
>
>
> On Fri, Jul 12, 2013 at 11:11 AM, Tristan Zajonc
> <tris...@gmail.com<javascript:>
> > wrote:
>
>> Michael,
>>
>> Right, but I need the core1 associated with a particular cluster. This
>> is why I was trying to use an intersection. But I can't easily use the
>> intersection syntax, hosts: core1&:$cloud, to select from hostvars. As a
>> result, I've tried renaming my inventory so that they are named
>> ${cloud}core1. Then I select variables with with hostvars[groups[cloud +
>> "core1"][0]]['variable_name']. Is there a better way?
>>
>> Tristan
>>
>>
>>
>> On Fri, Jul 12, 2013 at 11:04 AM, Michael DeHaan
>> <mic...@ansibleworks.com<javascript:>
>> > wrote:
>>
>>> "I am struggling with the best way to access variables of another host,
>>> namely the ip address of core1,core2,core3"
>>>
>>> This should be all you need to get the first host in "core1"
>>>
>>> hostvars[groups["core1"][0]]["variable_name"]
>>>
>>>
>>>
>>>
>>>
>>> On Fri, Jul 12, 2013 at 10:48 AM, Tristan Zajonc
>>> <tris...@gmail.com<javascript:>
>>> > wrote:
>>>
>>>> Michael,
>>>>
>>>> Yes, I figure I'm not doing this the "Ansible Way" and my eyes are
>>>> bleeding as well. I'm writing Ansible scripts to manage multiple Hadoop
>>>> clusters. I had 4 roles: core1, core2, core3, and slaves. I organized my
>>>> inventory into these groups and also had a "cloud" group, which is just a
>>>> particular Hadoop cluster. I would then select things like
>>>> "hosts:core1:&$cloud" where I pass in $cloud as a command line extra-vars.
>>>> I've tried changing my inventory scheme and use "hosts: ${cloud}core1",
>>>> but this also is awkward.
>>>>
>>>> I am struggling with the best way to access variables of another host,
>>>> namely the ip address of core1,core2,core3. I do not have fixed
>>>> hostnames,
>>>> so I was trying to use groups. I'm not sure how to do it in the first
>>>> inventory scheme, because can't do intersections, but in the second I
>>>> could
>>>> do:
>>>>
>>>> {{
>>>> hostvars[groups[cloud+'core1'][0]]['ansible_eth0']['ipv4']['address'] }}
>>>>
>>>> I feel like I'm missing some way to define dynamic global variables. I
>>>> looked at set_fact, but it doesn't seem to stick around for my entire
>>>> playbook. Is there a way to set a global variable that persists across
>>>> the
>>>> entire playbook.yml (multiple hosts: selections). Or is there a better
>>>> way
>>>> to get some dynamic facts and use them across hosts?
>>>>
>>>> Feedback very much appreciated.
>>>>
>>>> Tristan
>>>>
>>>> On Thursday, July 11, 2013 7:34:01 PM UTC-4, Michael DeHaan wrote:
>>>>
>>>>> This makes my eyes kind of bleed.
>>>>>
>>>>> In general when you are modelling something and it gets this ugly,
>>>>> step back and think about the use case -- things in Ansible should never
>>>>> look like this. The project exists to avoid such things :)
>>>>>
>>>>> "I use intersections to select roles within the cloud" doesn't make
>>>>> sense to me, unfortunately, can you explain more and show your command
>>>>> line
>>>>> use case and a bit more info?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Thu, Jul 11, 2013 at 3:30 PM, Tristan Zajonc <tris...@gmail.com>wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I have an inventory setup where instances have roles with a cloud.
>>>>>> Because there are multiple clouds I use intersections to select roles
>>>>>> within a cloud, and pass in the cloud name as an extra variable at the
>>>>>> command line. This seems to work well for selecting hosts, but I'm
>>>>>> struggling to use intersections in templates or variables. For
>>>>>> instance, I
>>>>>> have three core nodes and I'd like to put the IP addresses in
>>>>>> /etc/hosts.
>>>>>> I have been trying variations of:
>>>>>>
>>>>>> {{hostvars[set(groups['Core1']).intersection(set(groups[
>>>>>> cloud])).pop()].ansible_eth0.ipv4.address}}
>>>>>>
>>>>>> but nothing works.
>>>>>>
>>>>>> Alternatively, is there a way for hosts to register global variables?
>>>>>> In that case I'd just connect and register these up front.
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Tristan
>>>>>>
>>>>>>
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>
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>>>>
>>>
>>>
>>>
>>> --
>>> Michael DeHaan <mic...@ansibleworks.com <javascript:>>
>>> CTO, AnsibleWorks, Inc.
>>> http://www.ansibleworks.com/
>>>
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>
>
>
> --
> Michael DeHaan <mic...@ansibleworks.com <javascript:>>
> CTO, AnsibleWorks, Inc.
> http://www.ansibleworks.com/
>
>
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