While using ceph-ansible-3.1.0.0-0.beta6.1.el7.noarch to configure a server to communicate with an external ceph cluster, the deployment fails on task: "create cephx key(s)" [1]. 

I was able to reproduce the problem by running the same command the ceph-ansible tried to run [2]. 

When examining the server where the task failed I found that the ceph-create-keys daemon (with the same container ID) was running at some point but that it had stopped. 

[root@rhosp-ctrl0 ~]# docker ps -a
CONTAINER ID        IMAGE                                                             COMMAND                  CREATED             STATUS                         PORTS               NAMES
6d391bc9842c        registry.access.redhat.com/rhceph/rhceph-3-rhel7:latest           "sleep 300"              About an hour ago   Exited (0) About an hour ago                       ceph-create-keys

Maybe there is a race condition with the dummy container not being available when needed? (just a theory) I'll attach more logs.

https://github.com/ceph/ceph-ansible/blob/f711c51f395df181c5f821fca7ef879af79fdb64/roles/ceph-client/tasks/create_users_keys.yml#L15-L26

[1] 
2018-04-16 19:54:55,600 p=2591 u=mistral |  TASK [ceph-client : create cephx key(s)] ***************************************
2018-04-16 19:54:55,601 p=2591 u=mistral |  Monday 16 April 2018  19:54:55 +0000 (0:00:00.048)       0:01:06.258 ********** 
2018-04-16 19:59:55,593 p=2591 u=mistral |  failed: [192.168.213.214] (item={'caps': {'mds': u'', 'osd': u'allow class-read object_prefix rbd_children, allow rwx pool=rhosp-volumes, allow rwx pool=rhosp-backup, allow rwx pool=rhosp-vms, allow rwx pool=rhosp-images, allow rwx pool=rhosp-metrics', 'mon': u'allow r', 'mgr': u'allow *'}, 'mode': u'0600', 'key': u'AQC8ZSlakbFkMBAAAZFQjIgWVZQ+HVnKc3FpTw==', 'name': u'client.rhosp'}) => {"changed": true, "cmd": ["docker", "exec", "ceph-create-keys", "ceph-authtool", "--create-keyring", "/etc/ceph/ceph.client.rhosp.keyring", "--name", "client.rhosp", "--add-key", "AQC8ZSlakbFkMBAAAZFQjIgWVZQ+HVnKc3FpTw==", "--cap", "mds", "", "--cap", "osd", "allow class-read object_prefix rbd_children, allow rwx pool=rhosp-volumes, allow rwx pool=rhosp-backup, allow rwx pool=rhosp-vms, allow rwx pool=rhosp-images, allow rwx pool=rhosp-metrics", "--cap", "mon", "allow r", "--cap", "mgr", "allow *"], "delta": "0:04:59.598733", "end": "2018-04-16 15:59:55.574075", "item": {"caps": {"mds": "", "mgr": "allow *", "mon": "allow r", "osd": "allow class-read object_prefix rbd_children, allow rwx pool=rhosp-volumes, allow rwx pool=rhosp-backup, allow rwx pool=rhosp-vms, allow rwx pool=rhosp-images, allow rwx pool=rhosp-metrics"}, "key": "AQC8ZSlakbFkMBAAAZFQjIgWVZQ+HVnKc3FpTw==", "mode": "0600", "name": "client.rhosp"}, "msg": "non-zero return code", "rc": 126, "start": "2018-04-16 15:54:55.975342", "stderr": "", "stderr_lines": [], "stdout": "rpc error: code = 2 desc = oci runtime error: exec failed: container \"6d391bc9842c993ae6123f023d24da305a96dfe8d64e3607973c665cd8880129\" does not exist", "stdout_lines": ["rpc error: code = 2 desc = oci runtime error: exec failed: container \"6d391bc9842c993ae6123f023d24da305a96dfe8d64e3607973c665cd8880129\" does not exist"]}

[2] 
[root@rhosp-ctrl0 ~]# docker exec ceph-create-keys ceph-authtool --create-keyring /etc/ceph/ceph.client.rhosp.keyring --name client.rhosp --add-key AQC8ZSlakbFkMBAAAZFQjIgWVZQ+HVnKc3FpTw== --cap mds  --cap osd allow class-read object_prefix rbd_children, allow rwx pool=rhosp-volumes, allow rwx pool=rhosp-backup, allow rwx pool=rhosp-vms, allow rwx pool=rhosp-images, allow rwx pool=rhosp-metrics --cap mon allow r --cap mgr allow * 
Error response from daemon: Container 6d391bc9842c993ae6123f023d24da305a96dfe8d64e3607973c665cd8880129 is not running
[root@rhosp-ctrl0 ~]#