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https://github.com/ceph/ceph
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231 lines
7.7 KiB
ReStructuredText
231 lines
7.7 KiB
ReStructuredText
=====================
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Operating a Cluster
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=====================
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.. index:: Upstart; operating a cluster
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Running Ceph with Upstart
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=========================
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When deploying Ceph Cuttlefish and beyond with ``ceph-deploy``, you may start
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and stop Ceph daemons or the entire cluster using the event-based `Upstart`_.
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Upstart does not require you to define daemon instances in the Ceph configuration
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file (although, they are still required for ``sysvinit`` should you choose to
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use it).
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To list the Ceph Upstart jobs and instances, execute::
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sudo initctl list | grep ceph
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See `initctl`_ for additional details.
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Starting a Cluster
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------------------
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To start the cluster, execute the following::
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sudo start ceph-all
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Stopping a Cluster
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------------------
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To stop the cluster, execute the following::
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sudo stop ceph-all
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Starting all Daemons by Type
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----------------------------
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To start all daemons of a particular type, execute one of the following::
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sudo start ceph-osd-all
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sudo start ceph-mon-all
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sudo start ceph-mds-all
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Stopping all Daemons by Type
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----------------------------
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To stop all daemons of a particular type, execute one of the following::
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sudo stop ceph-osd-all
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sudo stop ceph-mon-all
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sudo stop ceph-mds-all
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Starting a Daemon
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-----------------
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To start a specific daemon instance, execute one of the following::
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sudo start ceph-osd id={id}
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sudo start ceph-mon id={hostname}
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sudo start ceph-mds id={hostname}
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For example::
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sudo start ceph-osd id=1
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sudo start ceph-mon id=ceph-server
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sudo start ceph-mds id=ceph-server
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Stopping a Daemon
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-----------------
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To stop a specific daemon instance, execute one of the following::
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sudo stop ceph-osd id={id}
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sudo stop ceph-mon id={hostname}
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sudo stop ceph-mds id={hostname}
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For example::
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sudo stop ceph-osd id=1
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sudo start ceph-mon id=ceph-server
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sudo start ceph-mds id=ceph-server
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.. index:: Ceph service; sysvinit; operating a cluster
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Running Ceph as a Service
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=========================
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When you deploy Ceph Argonaut or Bobtail with ``mkcephfs``, use the
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service or traditional sysvinit.
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The ``ceph`` service provides functionality to **start**, **restart**, and
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**stop** your Ceph cluster. Each time you execute ``ceph`` processes, you
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must specify at least one option and one command. You may also specify a daemon
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type or a daemon instance. For most newer Debian/Ubuntu distributions, you may
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use the following syntax::
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sudo service ceph [options] [commands] [daemons]
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For older distributions, you may wish to use the ``/etc/init.d/ceph`` path::
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sudo /etc/init.d/ceph [options] [commands] [daemons]
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The ``ceph`` service options include:
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+-----------------+----------+-------------------------------------------------+
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| Option | Shortcut | Description |
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+=================+==========+=================================================+
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| ``--verbose`` | ``-v`` | Use verbose logging. |
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+-----------------+----------+-------------------------------------------------+
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| ``--valgrind`` | ``N/A`` | (Dev and QA only) Use `Valgrind`_ debugging. |
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+-----------------+----------+-------------------------------------------------+
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| ``--allhosts`` | ``-a`` | Execute on all nodes in ``ceph.conf.`` |
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| | | Otherwise, it only executes on ``localhost``. |
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+-----------------+----------+-------------------------------------------------+
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| ``--restart`` | ``N/A`` | Automatically restart daemon if it core dumps. |
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+-----------------+----------+-------------------------------------------------+
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| ``--norestart`` | ``N/A`` | Don't restart a daemon if it core dumps. |
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+-----------------+----------+-------------------------------------------------+
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| ``--conf`` | ``-c`` | Use an alternate configuration file. |
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+-----------------+----------+-------------------------------------------------+
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The ``ceph`` service commands include:
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+------------------+------------------------------------------------------------+
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| Command | Description |
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+==================+============================================================+
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| ``start`` | Start the daemon(s). |
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+------------------+------------------------------------------------------------+
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| ``stop`` | Stop the daemon(s). |
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+------------------+------------------------------------------------------------+
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| ``forcestop`` | Force the daemon(s) to stop. Same as ``kill -9`` |
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+------------------+------------------------------------------------------------+
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| ``killall`` | Kill all daemons of a particular type. |
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+------------------+------------------------------------------------------------+
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| ``cleanlogs`` | Cleans out the log directory. |
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+------------------+------------------------------------------------------------+
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| ``cleanalllogs`` | Cleans out **everything** in the log directory. |
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+------------------+------------------------------------------------------------+
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For subsystem operations, the ``ceph`` service can target specific daemon types by
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adding a particular daemon type for the ``[daemons]`` option. Daemon types include:
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- ``mon``
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- ``osd``
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- ``mds``
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The ``ceph`` service's ``[daemons]`` setting may also target a specific instance.
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To start a Ceph daemon on the local :term:`Ceph Node`, use the following syntax::
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sudo /etc/init.d/ceph start osd.0
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To start a Ceph daemon on another node, use the following syntax::
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sudo /etc/init.d/ceph -a start osd.0
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Where ``osd.0`` is the first OSD in the cluster.
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Starting a Cluster
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------------------
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To start your Ceph cluster, execute ``ceph`` with the ``start`` command.
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The usage may differ based upon your Linux distribution. For example, for most
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newer Debian/Ubuntu distributions, you may use the following syntax::
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sudo service ceph [options] [start|restart] [daemonType|daemonID]
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For older distributions, you may wish to use the ``/etc/init.d/ceph`` path::
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sudo /etc/init.d/ceph [options] [start|restart] [daemonType|daemonID]
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The following examples illustrates a typical use case::
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sudo service ceph -a start
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sudo /etc/init.d/ceph -a start
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Once you execute with ``-a`` (i.e., execute on all nodes), Ceph should begin
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operating. You may also specify a particular daemon instance to constrain the
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command to a single instance. To start a Ceph daemon on the local Ceph Node,
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use the following syntax::
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sudo /etc/init.d/ceph start osd.0
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To start a Ceph daemon on another node, use the following syntax::
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sudo /etc/init.d/ceph -a start osd.0
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Stopping a Cluster
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------------------
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To stop your Ceph cluster, execute ``ceph`` with the ``stop`` command.
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The usage may differ based upon your Linux distribution. For example, for most
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newer Debian/Ubuntu distributions, you may use the following syntax::
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sudo service ceph [options] stop [daemonType|daemonID]
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For example::
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sudo service ceph -a stop
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For older distributions, you may wish to use the ``/etc/init.d/ceph`` path::
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sudo /etc/init.d/ceph -a stop
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Once you execute with ``-a`` (i.e., execute on all nodes), Ceph should shut
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down. You may also specify a particular daemon instance to constrain the
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command to a single instance. To stop a Ceph daemon on the local Ceph Node,
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use the following syntax::
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sudo /etc/init.d/ceph stop osd.0
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To stop a Ceph daemon on another node, use the following syntax::
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sudo /etc/init.d/ceph -a stop osd.0
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.. _Valgrind: http://www.valgrind.org/
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.. _Upstart: http://upstart.ubuntu.com/index.html
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.. _initctl: http://manpages.ubuntu.com/manpages/raring/en/man8/initctl.8.html |