Cluster model

A cluster defines a separate Ceph cluster. It has a default name that you can edit only explicitly. You can delete only the cluster that has no servers in it.

An explicit cluster model is required because it defines a name of FSID for Ceph. By default, the name of the model is used as a name of the Ceph cluster and its ID as FSID.

The cluster model configuration is a simple mapping of roles to the list of servers. You cannot manage this configuration explicitly. Instead, you can use playbooks. For example, when executing the playbook for adding a new OSD host, this host will be added to the list of servers for role osds. If you remove Rados Gateways from the clusters using an appropriate playbook, these servers will be deleted from the list.

Several models are required to deploy a cluster. Basically, cluster deployment contains the following steps:

1. Creating an empty cluster model. This model is a holder for the cluster configuration. Also, it defines the Ceph FSID and name.

2. Creating a playbook configuration model for the deploy_cluster playbook. This will allow you to deploy the cluster.

   Note

   Cluster deployment is an idempotent operation and you may execute it several times.

3. Executing that playbook configuration by creating a new execution. If required, examine the execution steps or logs.

See also

• Playbook configuration
• Playbook execution