ceph-mon fails to start when CEPH_DATA_DIR is overridden

[Fiatala Salamo]

System: CentOS 7

ceph-mon needs a '--mon-data ${CEPH_DATA_DIR}/mon/ceph-$(hostname)'
https://github.com/openstack/devstack-plugin-ceph/blob/master/devstack/lib/ceph#L389

Without that flag the keyring and store are written to the default location with root ownership. The service then fails to start.

[Fiatala Salamo (fsalamo)]

Looks like this will also need a "mon data" change in ceph.conf.

[Fiatala Salamo (fsalamo)]

Never mind - looks like keyring is hard-coded, so modifying the mon-data string or the config won't work. e.g.

    [mon]
    mon data = ...
    keyring = ...

ceph-create-keys runs when the service starts, and it only knows about /var/lib/ceph.
https://github.com/ceph/ceph/blob/master/src/ceph-create-keys#L108

[sven mark (svenmark)]

yeah,only this local.conf var CEPH_DISK_IMAGE is valid, if other namespace is to be used.