Substituting lists in playbook

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1

Hi there,
I’m trying to do a pretty simple thing and I can’t make it work, I’ll be grateful for any help.
I’m trying to assign a list of hosts from a group to a variable, which later on, I would like to iterate over in j2 template. Here is an extract:

I have an /etc/ansible/hosts file:

[zookeepers]
node01 id=1
node02 id=2
node03 id=3

part of playbook zookeeper.yml:

  • hosts: zookeepers
    sudo: True
    roles:
  • role: ansible-zookeeper
    version: “3.4.6”
    zookeeper_hosts: “{{ groups.zookeepers }}” # I would like to assign all nodes of zookeepers group to a variable

part of template zoo.cfg.j2:

{% for server in zookeeper_hosts %}

server.{{ hostvars[“{{server}}”][“id”] }} = {{server}}:2888:3888

{% endfor %}

This code does not work, because zookeeper_hosts variable is a string, and iterating over it means iterating over letters of the string. Not what I wanted.

I spent few hours trying weird combinations to do it, but I failed… The things that worked:

  1. Hard coding the list of hosts in playbook, instead of using groups.zookeepers variable
  2. Creating string joined by ‘,’ in playbook ( "{{ groups.zookeepers | join(‘,’) }} " and then using zookeeper_hosts.split(‘,’) in j2 template. I wouldn’t like to modify the template as it is created by someone else. Any way, it doesn’t seem clean.

Please anyone help me with this.
Thank you!
Krzysztof

2

you can use the groups variable directly in your template, as it is a
list, also you are stacking moustaches and that does not work!!!

no {{ {{ }} }} , you only need one set {{ }}, anything inside you do
not quote is var:

{% for server in groups['zookeepers'] %}

server.{{ hostvars[server]["id"] }} = {{server}}:2888:3888

{% endfor %}