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---
- name: create a list and use it for something
  hosts: all
  vars:
    existing_list: [ "1","2","3","4","5","6","7","8","9"]
    ip_list: []
  gather_facts: no
  tasks:
    - name: loop over hosts and create list of IP:PORT entries
      set_fact:

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{% for a, b in list1|zip(list2) %}
{{ a }}: {{ b }}
{% endfor %}`

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---
# vim: set ft=ansible:
- name: matching line
  vars:
    stdout_lines:
      - ""
      - ""
      - "db_instance                               : localhost"
      - "db_type                                   : mongoDB"
      - "db_user                                   : "

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---
- name: groups
  hosts: localhost
  gather_facts: no
  tasks:
    - debug:
        msg: "{{ item }}"
      with_items: "{{ groups['all'] }}"
    - command: echo "{{ item }}"
      with_items: "{{ groups['all'] }}"

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{# vim: set ft=jinja #}

{% for ntpserver in ntpservers %}
server {{ ntpserver }}
{% endfor %}

### other config ###

-------------
then for any given group you can just define ntpservers as a list:

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---
- name: find stuff
  hosts: localhost
  tasks:
    - find:
        paths:
          - /etc/pam.d
        file_type: file
        patterns:
          - system*

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- name: test stuff
  hosts: all
  gather_facts: no

  tasks:
    - name: set fact
      set_fact:
        myfact: "it is very good"

    - name: test for it

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---
- hosts: localhost
  vars:
    input: "  THiS IS An ExaMpLE  "
  tasks:
    - debug:
        msg: "just lower: XXX{{ input | lower }}XXX"
    - debug:
        msg: "just trim: XXX{{ input | trim }}XXX"
    - debug:

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---
- hosts: all
  tasks:
    - debug:
        msg: "{{ inventory_hostname }} sensu warn: {{ sensu_check_cpu_warning }}"
        
    - debug:
        msg: "{{ inventory_hostname }} sensu crit: {{ sensu_check_cpu_critical }}"
        
    - debug:

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docker_container:
  docker_host: "{{ groups['etcd']|first }}:{{ docker_port }}"
  image "myregistry:5000/redis:2.8.21"
  env:
    APP_NAME: "/CA/redis"
  volumes:
    - "/etc/hostname:/etc/hypervisor:ro"
  name: rmaster01
  hostname: rmaster01
  network_mode: "{{ swarm_overlay_network }}"