After you create your initial monitors, you can use the Ceph CLI to check on your cluster. However, you have to specify the monitor and admin keyring each time with the path to the directory holding your configuration, but you can simplify your CLI usage by making the admin node a Ceph admin client.

ceph-deploy admin <node-name>

For example:

ceph-deploy admin admin-node

The ceph-deploy utility will copy the ceph.conf and ceph.client.admin.keyring files to the etc/ceph directory. When ceph-deploy is talking to the local admin host (admin-node), it must be reachable by its hostname (e.g., hostname -s). If necessary, modify /etc/hosts to add the name of the admin host. If you do not have an /etc/ceph directory, you should install ceph-common.

You may then use the Ceph CLI.

Once you have added your new Ceph monitors, Ceph will begin synchronizing the monitors and form a quorum. You can check the quorum status by executing the following:

sudo ceph quorum_status --format json-pretty

Ensure that you have acceptable permissions for the /etc/ceph/ceph.client.admin.keyring. You can use sudo when executing the ceph command, or your can change the keyring permissions to enable a specific user or group. Keyring permissions provide administrative capability to the Red Hat Ceph Storage cluster. So exercise caution if many users have access to the Ceph nodes and admin node.

sudo chmod +r /etc/ceph/ceph.client.admin.keyring