Jinja2: How to gather_facts from other hosts

If you have this content in your inventory file:

[loadbalancers]
ha01 ansible_host=ec2-52-50-164-246.eu-west-1.compute.amazonaws.com
ha02 ansible_host=ec2-52-48-101-228.eu-west-1.compute.amazonaws.com

[webservers]
web01 ansible_host=ec2-52-50-143-215.eu-west-1.compute.amazonaws.com
web02 ansible_host=ec2-52-31-14-253.eu-west-1.compute.amazonaws.com

And you want to create a template inside your loadbalancers with information from webservers, like for example following haproxy configuration:

{% for host in groups['webservers'] %}
server {{ hostvars[host]['ansible_hostname'] }} {{ hostvars[host]['ansible_default_ipv4']['address'] }}:80
{% endfor %}

You first need to connect to webservers. No need to do anything. So, your playbook will look like:

---
# No need to run a task for webservers. This will gather their facts.
- hosts: webservers
  become: yes

- hosts: loadbalancers
  become: yes
  roles:
- haproxy-ha

This will connect first to your webservers and gather their facts that will be used in haproxy.cfg.j2 template file.

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