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doc: Consolidated start and stop.

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Signed-off-by: John Wilkins <john.wilkins@inktank.com>
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John Wilkins 2012-09-04 11:36:33 -07:00
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=====================
Operating a Cluster
=====================
The ``ceph`` service provides functionality to **start**, **restart**, and
**stop** your Ceph cluster. Each time you execute ``ceph`` processes, you
must specify at least one option and one command. You may also specify a daemon
type or a daemon instance. For most newer Debian/Ubuntu distributions, you may
use the following syntax::
sudo service ceph [options] [commands] [daemons]
For older distributions, you may wish to use the ``/etc/init.d/ceph`` path::
sudo /etc/init.d/ceph [options] [commands] [daemons]
The ``ceph`` service options include:
+-----------------+----------+-------------------------------------------------+
| Option | Shortcut | Description |
+=================+==========+=================================================+
| ``--verbose`` | ``-v`` | Use verbose logging. |
+-----------------+----------+-------------------------------------------------+
| ``--valgrind`` | ``N/A`` | (Developers only) Use `Valgrind`_ debugging. |
+-----------------+----------+-------------------------------------------------+
| ``--allhosts`` | ``-a`` | Execute on all hosts in ``ceph.conf.`` |
| | | Otherwise, it only executes on ``localhost``. |
+-----------------+----------+-------------------------------------------------+
| ``--restart`` | ``N/A`` | Automatically restart daemon if it core dumps. |
+-----------------+----------+-------------------------------------------------+
| ``--norestart`` | ``N/A`` | Don't restart a daemon if it core dumps. |
+-----------------+----------+-------------------------------------------------+
| ``--conf`` | ``-c`` | Use an alternate configuration file. |
+-----------------+----------+-------------------------------------------------+
The ``ceph`` service commands include:
+------------------+------------------------------------------------------------+
| Command | Description |
+==================+============================================================+
| ``start`` | Start the daemon(s). |
+------------------+------------------------------------------------------------+
| ``stop`` | Stop the daemon(s). |
+------------------+------------------------------------------------------------+
| ``forcestop`` | Force the daemon(s) to stop. Same as ``kill -9`` |
+------------------+------------------------------------------------------------+
| ``killall`` | Kill all daemons of a particular type. |
+------------------+------------------------------------------------------------+
| ``cleanlogs`` | Cleans out the log directory. |
+------------------+------------------------------------------------------------+
| ``cleanalllogs`` | Cleans out **everything** in the log directory. |
+------------------+------------------------------------------------------------+
For subsystem operations, the ``ceph`` service can target specific daemon types by
adding a particular daemon type for the ``[daemons]`` option. Daemon types include:
- ``mon``
- ``osd``
- ``mds``
The ``ceph`` service's ``[daemons]`` setting may also target a specific instance::
sudo /etc/init.d/ceph -a start osd.0
Where ``osd.0`` is the first OSD in the cluster.
Starting a Cluster
------------------
To start your Ceph cluster, execute ``ceph`` with the ``start`` command.
The usage may differ based upon your Linux distribution. For example, for most
newer Debian/Ubuntu distributions, you may use the following syntax::
sudo service ceph start [options] [start|restart] [daemonType|daemonID]
For older distributions, you may wish to use the ``/etc/init.d/ceph`` path::
sudo /etc/init.d/ceph [options] [start|restart] [daemonType|daemonID]
The following examples illustrates a typical use case::
sudo service ceph -a start
sudo /etc/init.d/ceph -a start
Once you execute with ``-a``, Ceph should begin operating. You may also specify
a particular daemon instance to constrain the command to a single instance. For
example::
sudo /etc/init.d/ceph start osd.0
Stopping a Cluster
------------------
To stop your Ceph cluster, execute ``ceph`` with the ``stop`` command.
The usage may differ based upon your Linux distribution. For example, for most
newer Debian/Ubuntu distributions, you may use the following syntax::
sudo service ceph [options] stop [daemonType|daemonID]
For example::
sudo service -a ceph stop
For older distributions, you may wish to use the ``/etc/init.d/ceph`` path::
sudo /etc/init.d/ceph -a stop
Ceph should shut down the operating processes.
.. _Valgrind: http://www.valgrind.org/