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113 lines
4.8 KiB
ReStructuredText
113 lines
4.8 KiB
ReStructuredText
=====================
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Operating a Cluster
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=====================
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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 hosts 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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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 start [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``, Ceph should begin operating. You may also specify
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a particular daemon instance to constrain the command to a single instance. For
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example::
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sudo /etc/init.d/ceph 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 -a ceph 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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Ceph should shut down the operating processes.
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.. _Valgrind: http://www.valgrind.org/ |