Description of problem:
configuration of cephFS is failing when '--limit mdss' is used with site-docker.yml as container_exec_cmd is not getting formulated
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Configure a ceph containerized cluster
2. Try to add mds following the doc
msg: '[Errno 2] No such file or directory: ''ceph'': ''ceph'''
MDS must get added configuring cephFS
 has fixes, verified regression for configuration from scratch also
It would be nice if we can backport to stable-4.0, need to release-note otherwise.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.