Appendix J. OSD Ansible settings

These are the most common configurable OSD Ansible parameters.

osd_auto_discovery

Automatically find empty devices to use as OSDs.

Value: false
Required: No
Notes: Cannot be used with devices. Cannot be used with purge-docker-cluster.yml or purge-cluster.yml. To use those playbooks, comment out osd_auto_discovery and declare the OSD devices using devices.

devices

List of devices where Ceph’s data is stored.

Value: User-defined
Required: Yes, if specifying a list of devices.
Notes: Cannot be used when osd_auto_discovery setting is used. When using the devices option, ceph-volume lvm batch mode creates the optimized OSD configuration.

dmcrypt

To encrypt the OSDs.

lvm_volumes

A list of FileStore or BlueStore dictionaries.

Value: User-defined
Required: Yes, if storage devices are not defined using the devices parameter.
Notes: Each dictionary must contain a data, journal and data_vg keys. Any logical volume or volume group must be the name and not the full path. The data, and journal keys can be a logical volume (LV) or partition, but do not use one journal for multiple data LVs. The data_vg key must be the volume group containing the data LV. Optionally, the journal_vg key can be used to specify the volume group containing the journal LV, if applicable.

osds_per_device

The number of OSDs to create per device.

osd_objectstore

The Ceph object store type for the OSDs.