Comment 1 for bug 1562998

The SIG repos are officially available in CentOS 7:

# yum install centos-release-ceph
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.ci.centos.org
 * extras: mirror.ci.centos.org
 * updates: mirror.ci.centos.org
Resolving Dependencies
--> Running transaction check
---> Package centos-release-ceph-hammer.noarch 0:1.0-5.el7.centos will be installed
--> Processing Dependency: centos-release-storage-common for package: centos-release-ceph-hammer-1.0-5.el7.centos.noarch
--> Running transaction check
---> Package centos-release-storage-common.noarch 0:1-2.el7.centos will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==============================================================================================================================================================================================================================================================================================================================
 Package Arch Version Repository Size
==============================================================================================================================================================================================================================================================================================================================
Installing:
 centos-release-ceph-hammer noarch 1.0-5.el7.centos extras 4.5 k
Installing for dependencies:
 centos-release-storage-common noarch 1-2.el7.centos extras 4.5 k

Transaction Summary
==============================================================================================================================================================================================================================================================================================================================
Install 1 Package (+1 Dependent package)

Total download size: 9.1 k
Installed size: 2.0 k
Is this ok [y/d/N]: