Description of problem:

glusterfs installation failed on task "Ensure device mapper modules loaded"

Version-Release number of the following components:
rpm -q openshift-ansible
$ git log --oneline -1
57674e53c (HEAD -> master, origin/master, origin/HEAD) Merge pull request #7188 from mtnbikenc/entry-include-check

$ rpm -q ansible
ansible-2.4.1.0-2.fc26.noarch
$ ansible --version
ansible 2.4.1.0
  config file = /home/fedora/openshift-ansible/ansible.cfg
  configured module search path = [u'/home/fedora/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.13 (default, Sep  5 2017, 08:53:59) [GCC 7.1.1 20170622 (Red Hat 7.1.1-3)]



How reproducible: Always


Steps to Reproduce:
1. ansible-playbook -i inv.file openshift-ansible/playbooks/openshift-glusterfs/config.yml
2.
3.

Actual results:
TASK [openshift_storage_glusterfs : Ensure device mapper modules loaded] *****************************************************
task path: /home/fedora/openshift-ansible/roles/openshift_storage_glusterfs/tasks/kernel_modules.yml:2
fatal: [ec2-54-187-179-234.us-west-2.compute.amazonaws.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "msg": "AnsibleUndefinedVariable: Unable to look up a name or access an attribute in template string (#{{ ansible_managed }}\ndm_thin_pool\ndm_multipath\ntarget_core_user\n{% if inventory_hostname in groups.glusterfs or inventory_hostname in groups.glusterfs_registry %}\ndm_snapshot\ndm_mirror\n{% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"
}
fatal: [ec2-52-37-115-29.us-west-2.compute.amazonaws.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "msg": "AnsibleUndefinedVariable: Unable to look up a name or access an attribute in template string (#{{ ansible_managed }}\ndm_thin_pool\ndm_multipath\ntarget_core_user\n{% if inventory_hostname in groups.glusterfs or inventory_hostname in groups.glusterfs_registry %}\ndm_snapshot\ndm_mirror\n{% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"
}
fatal: [ec2-34-217-23-88.us-west-2.compute.amazonaws.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "msg": "AnsibleUndefinedVariable: Unable to look up a name or access an attribute in template string (#{{ ansible_managed }}\ndm_thin_pool\ndm_multipath\ntarget_core_user\n{% if inventory_hostname in groups.glusterfs or inventory_hostname in groups.glusterfs_registry %}\ndm_snapshot\ndm_mirror\n{% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"
}
fatal: [ec2-34-212-250-17.us-west-2.compute.amazonaws.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "msg": "AnsibleUndefinedVariable: Unable to look up a name or access an attribute in template string (#{{ ansible_managed }}\ndm_thin_pool\ndm_multipath\ntarget_core_user\n{% if inventory_hostname in groups.glusterfs or inventory_hostname in groups.glusterfs_registry %}\ndm_snapshot\ndm_mirror\n{% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"
}
fatal: [ec2-54-190-30-47.us-west-2.compute.amazonaws.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "msg": "AnsibleUndefinedVariable: Unable to look up a name or access an attribute in template string (#{{ ansible_managed }}\ndm_thin_pool\ndm_multipath\ntarget_core_user\n{% if inventory_hostname in groups.glusterfs or inventory_hostname in groups.glusterfs_registry %}\ndm_snapshot\ndm_mirror\n{% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"
}
fatal: [ec2-34-209-85-0.us-west-2.compute.amazonaws.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "msg": "AnsibleUndefinedVariable: Unable to look up a name or access an attribute in template string (#{{ ansible_managed }}\ndm_thin_pool\ndm_multipath\ntarget_core_user\n{% if inventory_hostname in groups.glusterfs or inventory_hostname in groups.glusterfs_registry %}\ndm_snapshot\ndm_mirror\n{% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"
}
fatal: [ec2-54-218-123-8.us-west-2.compute.amazonaws.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "msg": "AnsibleUndefinedVariable: Unable to look up a name or access an attribute in template string (#{{ ansible_managed }}\ndm_thin_pool\ndm_multipath\ntarget_core_user\n{% if inventory_hostname in groups.glusterfs or inventory_hostname in groups.glusterfs_registry %}\ndm_snapshot\ndm_mirror\n{% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"
}


Expected results:

Additional info:
Please attach logs from ansible-playbook with the -vvv flag
Will attach ansible.log and inv.file