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Chapter 3. Metavariables
Metavariables simplify Ceph Storage Cluster configuration dramatically. When a metavariable is set in a configuration value, Ceph expands the metavariable into a concrete value. Metavariables are very powerful when used within the [global], [osd], [mon] or [client] sections of your configuration file; however, you may also use them with the admin socket. Ceph metavariables are similar to Bash shell expansion.
Ceph supports the following metavariables:
$cluster
- Description
- Expands to the Ceph Storage Cluster name. Useful when running multiple Ceph Storage Clusters on the same hardware.
- Example
-
/etc/ceph/$cluster.keyring - Default
-
ceph
$type
- Description
-
Expands to one of
osdormon, depending on the type of the instant daemon. - Example
-
/var/lib/ceph/$type
$id
- Description
-
Expands to the daemon identifier. For
osd.0, this would be0. - Example
-
/var/lib/ceph/$type/$cluster-$id
$host
- Description
- Expands to the host name of the instant daemon.
$name
- Description
-
Expands to
$type.$id. - Example
-
/var/run/ceph/$cluster-$name.asok
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