Ceph
I found a problem installing ceph (0.80) under debian arm (a Raspberry PI) using ceph-deploy.
Upon issuing the suggested
ceph-deploy mon create-initial
I got an error retrieving the file
/var/lib/ceph/bootstrap-osd/ceph.keyring
In fact it was not created, and I needed to issue the command:
ceph auth get client.bootstrap-osd > /var/lib/ceph/bootstrap-osd/ceph.keyring
After this, the installation finished as expected