Here is a similar example from my project
Creating the instance on EC2:
---
- name: Create a cluster nodes on EC2
hosts: localhost
connection: local
tasks:
- name: Launch instances
local_action:
module: ec2
region: "{{region}}"
keypair: "{{key_name}}"
group: "{{security_group}}"
instance_type: "{{instance_type}}"
image: "{{image}}"
count: "{{cluster_nodes}}"
wait: yes
register: ec2_cluster
- name: Add instances to private ip group
local_action: add_host name={{item.private_ip}} groupname=Private
with_items: ec2_cluster.instances
In the role vars/main.yaml:
seed: "{{groups.Private[0]}}"
And using "seed" in the relevant template.
On Friday, April 3, 2015 at 9:26:54 PM UTC+3, James Martin wrote:
>
> Mike,
>
> This may give you some insight:
>
>
> https://github.com/basho-labs/ansible-riak/blob/develop/examples/form_cluster.yml
>
> Particularly:
>
> primary_node: "{{
> hostvars[groups['riak_cluster'][0]]['riak_outputs']['node_name'] }}"
>
> - James
>
>
>
> On Wednesday, April 1, 2015 at 5:16:12 PM UTC-4, MikeA wrote:
>>
>> I'm launching a cluster of ec2 instances and would like one (don't care
>> which one) of them to become a head node and pass it's IP to the other
>> cluster members. I've been looking for an easy way to do this but could not
>> fine one so would appreciate any assistance.
>>
>> Here is what I've got.
>> from my main playbook I'm calling a sub playbook that launches the ec2
>> instances. there i add the instances to the {{ group_name }} group. where
>> group_name is a variable defined in a var file.
>>
>> later on the main playbook I'd like to pull one of the IP's and feed it
>> into a startup script to be called on all the hosts.
>>
>> I could not find a way to extract element 0 from the group_name var
>> array.I tried this: set_fact: headnode={{ groups[[{{ group_name }}][0]] }}
>> but it did not work. I had to use the actual group_var value and then I got
>> the IP but it was not a clean string rather it looked like this:
>> [u'10.77.0.211',
>>
>> Any idea how to get a clean IP from the group_name set? BDW in the sub
>> playbook where I launch the instances I register the private ip's from the
>> instances: set_fact: private_ips: "{{ ec2.tagged_instances|join(', ',
>> attribute='private_ip') }}" but I cannot refer to this variable back in the
>> main playbook.
>>
>> thanks in advance.
>>
>
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