Ceph removes configuration files during the uninstallation

[Timur Nurlygayanov]

Steps To Reproduce:
1. Install OpenStack with Ceph OSD node on CentOS.
2. Execute the following commands on ceph node:
yum remove ceph
yum install libcephfs1
su -c 'rpm -Uvh http://ceph.com/rpm-dumpling/el6/x86_64/ceph-0.67.11-0.el6.x86_64.rpm'

Observed result:
New version of ceph can't start because we have no configuration files. Ceph will remove configuration file during the uninstallation.

[Dmitry Borodaenko (angdraug)]

Will be addressed by updated spec in the incoming Ceph 0.80.7.

[Aleksander Mogylchenko (amogylchenko)]

Ceph does not have ready-to-use configuration file in its packages. Instead, it provides samples which should be edited beforehand, or ceph-deploy tool, that can generate configuration for you.

Here is the quote from official documentation (http://ceph.com/docs/master/rados/configuration/ceph-conf/):
When you start a Ceph Storage Cluster, each daemon looks for a Ceph configuration file (i.e., ceph.conf by default) that provides the cluster’s configuration settings. For manual deployments, you need to create a Ceph configuration file. For tools that create configuration files for you (e.g., ceph-deploy, Chef, etc.), you may use the information contained herein as a reference.

Old files are removed from the system by the package manager, which is also a default behavior.