Testing group var precedence

00-setup.sh

#!/bin/bash

apt-get update && \
  apt-get purge -y nano && \
  apt-get install -y git vim tmux fail2ban build-essential python2.7 python-dev libssl-dev libffi-dev

curl --silent --show-error --retry 5 https://bootstrap.pypa.io/get-pip.py | sudo python2.7

pip install ansible==2.1.1

curl https://raw.githubusercontent.com/ansible/ansible/devel/lib/ansible/plugins/connection/lxc.py > /usr/local/lib/python2.7/dist-packages/ansible/plugins/connection/lxc.py

01-inventory.ini

[all]
localhost ansible_connection=local physical_host=localhost ansible_become=True ansible_user=root
container1 ansible_connection=lxc physical_host=localhost ansible_become=True ansible_user=root
container2 ansible_connection=lxc physical_host=localhost ansible_become=True ansible_user=root

[hosts]
localhost

[all_containers]
container1
container2

[monitoring_all]

[monitoring_all:children]
monitoring_server
monitoring_agent

[monitoring_server]
container1

[monitoring_agent]
container2

02-playbook.yml

- name: Prepare the hosts
  hosts: hosts
  tasks:

    - name: Install LXC packages
      apt:
        pkg: "{{ item }}"
        state: latest
        default_release: "trusty-backports"
      with_items:
        - lxc
        - lxc-dev
      tags: prepare-host

    - name: Install pip
      shell: "curl --silent --show-error --retry 5 https://bootstrap.pypa.io/get-pip.py | sudo python2.7"
      tags: prepare-host

    - name: Install LXC python library
      pip:
        name: lxc-python2
        state: latest
      tags: prepare-host

- name: Create and prepare containers                                                                                                                  [24/1688]
  hosts: all_containers
  gather_facts: no
  tasks:

    - name: Create the containers
      lxc_container:
        name: "{{ inventory_hostname }}"
        template: download
        state: started
        backing_store: dir
        template_options: --dist ubuntu --release trusty --arch amd64
        container_log: yes
        container_log_level: DEBUG
      delegate_to: "{{ physical_host }}"

    - name: Deploy the container prep script
      copy:
        content: |
          #!/usr/bin/env bash
          set -e -x
          export DEBIAN_FRONTEND=noninteractive
          apt-get update
          apt-get install -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" --force-yes python2.7
          rm -f /usr/bin/python
          ln -s /usr/bin/python2.7 /usr/bin/python
          userdel --force --remove ubuntu || true
          apt-get clean
        dest: "/var/lib/lxc/{{ inventory_hostname }}/rootfs/usr/local/bin/cache-prep-commands.sh"
        mode: "0755"
      delegate_to: "{{ physical_host }}"

    - name: Execute the container prep script
      command: "chroot /var/lib/lxc/{{ inventory_hostname }}/rootfs /usr/local/bin/cache-prep-commands.sh"
      delegate_to: "{{ physical_host }}"

- name: Check the value of myvar for monitoring_all
  hosts: monitoring_all
  gather_facts: no
  tasks:
    - debug:
        var: myvar

- name: Check the value of myvar for monitoring_server
  hosts: monitoring_server
  gather_facts: no
  tasks:
    - debug:
        var: myvar

- name: Check the value of myvar for monitoring_agent
  hosts: monitoring_agent
  gather_facts: no
  tasks:
    - debug:
        var: myvar

03-output.log

root@ansible1:~# ansible-playbook -i inventory test-playbook.yml

PLAY [Prepare the hosts] *******************************************************

TASK [setup] *******************************************************************
ok: [localhost]

TASK [Install LXC packages] ****************************************************
ok: [localhost] => (item=[u'lxc', u'lxc-dev'])

TASK [Install pip] *************************************************************
changed: [localhost]
 [WARNING]: Consider using get_url or uri module rather than running curl


TASK [Install LXC python library] **********************************************
ok: [localhost]

PLAY [Create and prepare containers] *******************************************

TASK [Create the containers] ***************************************************
ok: [container1 -> localhost]
ok: [container2 -> localhost]

TASK [Deploy the container prep script] ****************************************
ok: [container1 -> localhost]
ok: [container2 -> localhost]

TASK [Execute the container prep script] ***************************************
changed: [container2 -> localhost]
changed: [container1 -> localhost]

PLAY [Check the value of myvar for monitoring_all] *****************************

TASK [debug] *******************************************************************
ok: [container2] => {
    "myvar": "monitoring_agent"
}
ok: [container1] => {
    "myvar": "monitoring_all"
}

PLAY [Check the value of myvar for monitoring_server] **************************

TASK [debug] *******************************************************************
ok: [container1] => {
    "myvar": "monitoring_all"
}

PLAY [Check the value of myvar for monitoring_agent] ***************************

TASK [debug] *******************************************************************
ok: [container2] => {
    "myvar": "monitoring_agent"
}

PLAY RECAP *********************************************************************
container1                 : ok=5    changed=1    unreachable=0    failed=0
container2                 : ok=5    changed=1    unreachable=0    failed=0
localhost                  : ok=4    changed=1    unreachable=0    failed=0