Ansible: gather facts in a task

ansible

Right now in order to pull in ELK servers I have. Something like this for my main web app playbook

---

- hosts: elk
  gather_facts: true
  tags: ['apps']

- hosts: apps
  become: true
  roles:
    - common
    - app
  tags:
    - apps

That works fine but if I do something like

ansible-playbook ./runs/app.yml --limit app-01.domain.com

It skips over the elk servers.

So filebeat is setup in the common role. Is there anyway in like common/roles/filebeat.yml to gather_facts for the elk servers so I can clean it up and not skip them over if I want to limit ansible run to a single app server also?

Best Answer

delegate_facts

Delegated facts learn facts from some other host, even if that other host wasn't part of the play. Slightly modified from the documentation example play:

- hosts: apps
  tasks:
    - name: gather facts from apps
      tags: ['apps']
      setup:
      delegate_to: "{{item}}"
      delegate_facts: True
      with_items: "{{groups['elk']}}"

Related Solutions

Ssh – Ansible stuck on gathering facts

I was having a similar issue with Ansible ping on Vagrant, it just suddenly stuck for no reason and has previously worked absolutely fine. Unlike any other issue like ssh or connective issue, it just forever die with no timeout.

One thing I did to resolve this issue is to clean ~/.ansible directory and it just works again. I can't find out why, but it did get resolved.

If you got change to have it again try clean the ~/.ansible folder before you refresh your Vagrant.

Nginx – Multi-datacenter Ansible load balancer template

You can utilize magic variables group_names and groups to look up groups defined in your inventory:

---
- hosts: webservers
  vars:
    dcs: [dc_1, dc_2, dc_3]
  tasks:
  - debug:
      msg: |
        upstream backend {
        {%- for dc in dcs %}
        {%-   if dc in group_names %}
        {%-     for host in groups[dc+'_appservers'] %}
        server {{host}};
        {%-     endfor %}
        {%-   endif %}
        {%- endfor %}
        }

This playbook will give you the following output.

TASK: [debug ]     **************************************************************** 
ok: [10.43.0.10] => {
    "msg": "upstream backend { server 10.43.0.20; server 10.43.0.21;}"
}
ok: [10.43.10.10] => {
    "msg": "upstream backend { server 10.43.10.20; server 10.43.10.21;}"
}
ok: [10.43.20.10] => {
    "msg": "upstream backend { server 10.43.20.20; server 10.43.20.21;}"
}

Change server {{host}}; as you need to.

Best Answer

delegate_facts

Related Solutions

Ssh – Ansible stuck on gathering facts

Nginx – Multi-datacenter Ansible load balancer template

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