This is happening late in the process, after successfully deploying the installation VM and then running second step from the metrics VM. 

CHECK [memory_availability : master0.xxxxxx.com] *************************************************************************************************
fatal: [master0.xxxxxxx.com]: FAILED! => {"changed": true, "checks": {"disk_availability": {}, "docker_image_availability": {"changed": true}, "docker_storage": {"failed": true, "failures": [["OpenShiftCheckException", "Could not find imported module support code for docker_info.  Looked for either AnsibleDockerClient.py or docker_common.py\nTraceback (most recent call last):\n  File \"/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/action_plugins/openshift_health_check.py\", line 225, in run_check\n    result = check.run()\n  File \"/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/openshift_checks/docker_storage.py\", line 53, in run\n    docker_info = self.execute_module(\"docker_info\", {})\n  File \"/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/openshift_checks/__init__.py\", line 211, in execute_module\n    result = self._execute_module(module_name, module_args, self.tmp, self.task_vars)\n  File \"/usr/lib/python2.7/site-packages/ansible/plugins/action/__init__.py\", line 809, in _execute_module\n    (module_style, shebang, module_data, module_path) = self._configure_module(module_name=module_name, module_args=module_args, task_vars=task_vars)\n  File \"/usr/lib/python2.7/site-packages/ansible/plugins/action/__init__.py\", line 203, in _configure_module\n    environment=final_environment)\n  File \"/usr/lib/python2.7/site-packages/ansible/executor/module_common.py\", line 1023, in modify_module\n    environment=environment)\n  File \"/usr/lib/python2.7/site-packages/ansible/executor/module_common.py\", line 859, in _find_module_utils\n    recursive_finder(module_name, b_module_data, py_module_names, py_module_cache, zf)\n  File \"/usr/lib/python2.7/site-packages/ansible/executor/module_common.py\", line 621, in recursive_finder\n    raise AnsibleError(' '.join(msg))\nAnsibleError: Could not find imported module support code for docker_info.  Looked for either AnsibleDockerClient.py or docker_common.py\n"]], "msg": "Could not find imported module support code for docker_info.  Looked for either AnsibleDockerClient.py or docker_common.py\nTraceback (most recent call last):\n  File \"/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/action_plugins/openshift_health_check.py\", line 225, in run_check\n    result = check.run()\n  File \"/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/openshift_checks/docker_storage.py\", line 53, in run\n    docker_info = self.execute_module(\"docker_info\", {})\n  File \"/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/openshift_checks/__init__.py\", line 211, in execute_module\n    result = self._execute_module(module_name, module_args, self.tmp, self.task_vars)\n  File \"/usr/lib/python2.7/site-packages/ansible/plugins/action/__init__.py\", line 809, in _execute_module\n    (module_style, shebang, module_data, module_path) = self._configure_module(module_name=module_name, module_args=module_args, task_vars=task_vars)\n  File \"/usr/lib/python2.7/site-packages/ansible/plugins/action/__init__.py\", line 203, in _configure_module\n    environment=final_environment)\n  File \"/usr/lib/python2.7/site-packages/ansible/executor/module_common.py\", line 1023, in modify_module\n    environment=environment)\n  File \"/usr/lib/python2.7/site-packages/ansible/executor/module_common.py\", line 859, in _find_module_utils\n    recursive_finder(module_name, b_module_data, py_module_names, py_module_cache, zf)\n  File \"/usr/lib/python2.7/site-packages/ansible/executor/module_common.py\", line 621, in recursive_finder\n    raise AnsibleError(' '.join(msg))\nAnsibleError: Could not find imported module support code for docker_info.  Looked for either AnsibleDockerClient.py or docker_common.py\n"}, "memory_availability": {}, "package_availability": {"changed": false, "invocation": {"module_args": {"packages": ["PyYAML", "bash-completion", "bind", "ceph-common", "dnsmasq", "docker", "firewalld", "flannel", "glusterfs-fuse", "httpd-tools", "iptables", "iptables-services", "iscsi-initiator-utils", "libselinux-python", "nfs-utils", "ntp", "openssl", "origin", "origin-clients", "origin-hyperkube", "origin-node", "pyparted", "python-httplib2", "yum-utils"]}}}, "package_version": {"changed": false, "invocation": {"module_args": {"package_list": [{"check_multi": false, "name": "origin", "version": ""}, {"check_multi": false, "name": "origin-master", "version": ""}, {"check_multi": false, "name": "origin-node", "version": ""}], "package_mgr": "yum"}}}}, "msg": "One or more checks failed", "playbook_context": "install"}

NO MORE HOSTS LEFT *******************************************************************************************************************************************

PLAY RECAP ***************************************************************************************************************************************************
localhost                  : ok=35   changed=1    unreachable=0    failed=0    skipped=16   rescued=0    ignored=0
master0.xxxxxxx.com : ok=96   changed=6    unreachable=0    failed=1    skipped=165  rescued=0    ignored=0


INSTALLER STATUS *********************************************************************************************************************************************
Initialization  : Complete (0:00:16)
Health Check    : In Progress (0:00:36)
This phase can be restarted by running: playbooks/openshift-checks/pre-install.yml
Sunday 26 May 2019  16:36:25 +0000 (0:00:36.151)       0:01:56.339 ************
===============================================================================
Run health checks (install) - EL --------------------------------------------------------------------------------------------------------------------- 36.15s
os_firewall : Ensure iptables services are not enabled ------------------------------------------------------------------------------------------------ 2.74s
openshift_repos : Ensure libselinux-python is installed ----------------------------------------------------------------------------------------------- 1.77s
openshift_repos : refresh cache ----------------------------------------------------------------------------------------------------------------------- 1.60s
Gather Cluster facts ---------------------------------------------------------------------------------------------------------------------------------- 1.51s
container_runtime : Fixup SELinux permissions for docker ---------------------------------------------------------------------------------------------- 1.33s
container_runtime : Place additional/blocked/insecure registries in /etc/containers/registries.conf --------------------------------------------------- 1.30s
Ensure openshift-ansible installer package deps are installed ----------------------------------------------------------------------------------------- 1.29s
container_runtime : Install Docker -------------------------------------------------------------------------------------------------------------------- 1.17s
Initialize openshift.node.sdn_mtu --------------------------------------------------------------------------------------------------------------------- 1.13s
os_firewall : Install firewalld packages -------------------------------------------------------------------------------------------------------------- 1.13s
container_runtime : Set various Docker options -------------------------------------------------------------------------------------------------------- 1.11s
install NetworkManager -------------------------------------------------------------------------------------------------------------------------------- 1.10s
openshift_repos : Configure correct origin release repository ----------------------------------------------------------------------------------------- 1.05s
container_runtime : Get current installed Docker version ---------------------------------------------------------------------------------------------- 1.04s
openshift_repos : Configure origin gpg keys ----------------------------------------------------------------------------------------------------------- 1.04s
openshift_repos : Remove openshift_additional.repo file ----------------------------------------------------------------------------------------------- 0.99s
container_runtime : Setup the docker-storage for overlay ---------------------------------------------------------------------------------------------- 0.96s
Detecting Operating System from ostree_booted --------------------------------------------------------------------------------------------------------- 0.95s
Gather Cluster facts ---------------------------------------------------------------------------------------------------------------------------------- 0.92s


Failure summary:


  1. Hosts:    master0.xxxxxxx.com
     Play:     OpenShift Health Checks
     Task:     Run health checks (install) - EL
     Message:  One or more checks failed
     Details:  check "docker_storage":
               Could not find imported module support code for docker_info.  Looked for either AnsibleDockerClient.py or docker_common.py
               Traceback (most recent call last):
                 File "/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/action_plugins/openshift_health_check.py", line 225, in run_check
                   result = check.run()
                 File "/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/openshift_checks/docker_storage.py", line 53, in run
                   docker_info = self.execute_module("docker_info", {})
                 File "/usr/share/ansible/openshift-ansible/roles/openshift_health_checker/openshift_checks/__init__.py", line 211, in execute_module
                   result = self._execute_module(module_name, module_args, self.tmp, self.task_vars)
                 File "/usr/lib/python2.7/site-packages/ansible/plugins/action/__init__.py", line 809, in _execute_module
                   (module_style, shebang, module_data, module_path) = self._configure_module(module_name=module_name, module_args=module_args, task_vars=task_vars)
                 File "/usr/lib/python2.7/site-packages/ansible/plugins/action/__init__.py", line 203, in _configure_module
                   environment=final_environment)
                 File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 1023, in modify_module
                   environment=environment)
                 File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 859, in _find_module_utils
                   recursive_finder(module_name, b_module_data, py_module_names, py_module_cache, zf)
                 File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 621, in recursive_finder
                   raise AnsibleError(' '.join(msg))
               AnsibleError: Could not find imported module support code for docker_info.  Looked for either AnsibleDockerClient.py or docker_common.py


The execution of "install_okd.yaml" includes checks designed to fail early if the requirements of the playbook are not met. One or more of these checks failed. To disregard these results,explicitly disable checks by setting an Ansible variable:
   openshift_disable_check=docker_storage
Failing check names are shown in the failure details above. Some checks may be configurable by variables if your requirements are different from the defaults; consult check documentation.
Variables can be set in the inventory or passed on the command line using the -e flag to ansible-playbook.