Create a Cluster

The first step in using Ceph with ceph-deploy is to create a new Ceph cluster. A new Ceph cluster has:

  • A Ceph configuration file, and

  • A monitor keyring.

The Ceph configuration file consists of at least:

  • Its own filesystem ID (fsid)

  • The initial monitor(s) hostname(s), and

  • The initial monitor(s) and IP address(es).

For additional details, see the Monitor Configuration Reference.

The ceph-deploy tool also creates a monitor keyring and populates it with a [mon.] key. For additional details, see the Cephx Guide.


To create a cluster with ceph-deploy, use the new command and specify the host(s) that will be initial members of the monitor quorum.

ceph-deploy new {host [host], ...}

For example:

ceph-deploy new
ceph-deploy new mon{1,2,3}

The ceph-deploy utility will use DNS to resolve hostnames to IP addresses. The monitors will be named using the first component of the name (e.g., mon1 above). It will add the specified host names to the Ceph configuration file. For additional details, execute:

ceph-deploy new -h