play_recap.log

PLAY [all] ******************************************************************** 

GATHERING FACTS *************************************************************** 
<defined.host.com> REMOTE_MODULE setup
<undefined.host.com> REMOTE_MODULE setup
ok: [defined.host.com]
ok: [undefined.host.com]

TASK: [debug var=hostvars[inventory_hostname]['my_groups'].keys()] ************ 
skipping: [undefined.host.com]
ok: [defined.host.com] => {
    "hostvars[inventory_hostname]['my_groups'].keys()": [                                                                                     
        "baremetal",                                                                                                                          
        "hypervisors",                                                                                                                        
        "alfresco"                                                                                                                            
    ]                                                                                                                                         
}                                                                                                                                             

TASK: [set_fact my_group_list="{{ hostvars[inventory_hostname]['my_groups'].keys() }}"] *** 
skipping: [undefined.host.com]
ok: [defined.host.com] => {"ansible_facts": {"my_group_list": "[u'baremetal', u'hypervisors', u'alfresco']"}}

TASK: [set_fact my_group_list=["nogroup"]] ************************************ 
skipping: [defined.host.com]
ok: [undefined.host.com] => {"ansible_facts": {"my_group_list": "[\"nogroup\"]"}}

TASK: [debug var=my_group_list] *********************************************** 
ok: [undefined.host.com] => {
    "my_group_list": [
        "nogroup"
    ]
}
ok: [defined.host.com] => {
    "my_group_list": [
        "baremetal", 
        "hypervisors", 
        "alfresco"
    ]
}

TASK: [debug var=item] ******************************************************** 
ok: [undefined.host.com] => (item=nogroup) => {
    "item": "nogroup"
}
ok: [defined.host.com] => (item=baremetal) => {
    "item": "baremetal"
}
ok: [defined.host.com] => (item=hypervisors) => {
    "item": "hypervisors"
}
ok: [defined.host.com] => (item=alfresco) => {
    "item": "alfresco"
}

TASK: [group_by key={{ item }}_group] ***************************************** 
created 'group_by' ActionModule: key=nogroup_group
changed: [undefined.host.com] => (item=nogroup) => {"changed": true, "groups": {"nogroup_group": ["undefined.host.com", "defined.host.com"]}, "item": "nogroup"}

PLAY [baremetal_group] ******************************************************** 
skipping: no hosts matched

site.yml

---

- hosts: all
  tasks:
  - debug: var=hostvars[inventory_hostname]['my_groups'].keys()
    when: hostvars[inventory_hostname].my_groups is defined

  - set_fact: my_group_list="{{ hostvars[inventory_hostname]['my_groups'].keys() }}"
    when: hostvars[inventory_hostname].my_groups is defined

  - set_fact: my_group_list=["nogroup"]
    when: not hostvars[inventory_hostname].my_groups is defined

  - debug: var=my_group_list
    when: hostvars[inventory_hostname].my_group_list is defined

  - debug: var=item
    with_items: hostvars[inventory_hostname].my_group_list
    when: hostvars[inventory_hostname].my_group_list is defined

  - group_by: key={{ item }}_group
    when: hostvars[inventory_hostname].my_group_list is defined
    with_items: hostvars[inventory_hostname].my_group_list

- hosts: baremetal_group
  tasks:
  - ping: