.. _ceph-manager-daemon:

===================
Ceph Manager Daemon
===================

The :term:`Ceph Manager` daemon (ceph-mgr) runs alongside monitor daemons,
to provide additional monitoring and interfaces to external monitoring
and management systems.

Since the 12.x (*luminous*) Ceph release, the ceph-mgr daemon is required for
normal operations.  The ceph-mgr daemon is an optional component in
the 11.x (*kraken*) Ceph release.

By default, the manager daemon requires no additional configuration, beyond
ensuring it is running.  If there is no mgr daemon running, you will
see a health warning to that effect, and some of the other information
in the output of `ceph status` will be missing or stale until a mgr is started.

Use your normal deployment tools, such as ceph-ansible or cephadm, to
set up ceph-mgr daemons on each of your mon nodes.  It is not mandatory
to place mgr daemons on the same nodes as mons, but it is almost always
sensible.

.. toctree::
    :maxdepth: 1

    Installation and Configuration <administrator>
    Writing modules <modules>
    Writing orchestrator plugins <orchestrator_modules>
    Dashboard module <dashboard>
    Ceph RESTful API <ceph_api/index>
    Alerts module <alerts>
    DiskPrediction module <diskprediction>
    Local pool module <localpool>
    RESTful module <restful>
    Zabbix module <zabbix>
    Prometheus module <prometheus>
    Influx module <influx>
    Hello module <hello>
    Telegraf module <telegraf>
    Telemetry module <telemetry>
    Iostat module <iostat>
    Crash module <crash>
    Insights module <insights>
    Orchestrator module <orchestrator>
    Rook module <rook>
    MDS Autoscaler module <mds_autoscaler>