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https://github.com/ceph/ceph
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252 lines
7.4 KiB
ReStructuredText
252 lines
7.4 KiB
ReStructuredText
=====================
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Operating a Cluster
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=====================
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.. index:: systemd; operating a cluster
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Running Ceph with systemd
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==========================
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For all distributions that support systemd (CentOS 7, Fedora, Debian Jessie
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8.x, SUSE), ceph daemons are now managed using native systemd files instead of
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the legacy sysvinit scripts. For example::
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sudo systemctl start ceph.target # start all daemons
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sudo systemctl status ceph-osd@12 # check status of osd.12
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To list the Ceph systemd units on a node, execute::
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sudo systemctl status ceph\*.service ceph\*.target
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Starting all Daemons
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--------------------
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To start all daemons on a Ceph Node (irrespective of type), execute the
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following::
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sudo systemctl start ceph.target
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Stopping all Daemons
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--------------------
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To stop all daemons on a Ceph Node (irrespective of type), execute the
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following::
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sudo systemctl stop ceph\*.service ceph\*.target
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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 on a Ceph Node, execute one of the
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following::
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sudo systemctl start ceph-osd.target
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sudo systemctl start ceph-mon.target
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sudo systemctl start ceph-mds.target
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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 on a Ceph Node, execute one of the
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following::
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sudo systemctl stop ceph-mon\*.service ceph-mon.target
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sudo systemctl stop ceph-osd\*.service ceph-osd.target
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sudo systemctl stop ceph-mds\*.service ceph-mds.target
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Starting a Daemon
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-----------------
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To start a specific daemon instance on a Ceph Node, execute one of the
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following::
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sudo systemctl start ceph-osd@{id}
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sudo systemctl start ceph-mon@{hostname}
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sudo systemctl start ceph-mds@{hostname}
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For example::
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sudo systemctl start ceph-osd@1
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sudo systemctl start ceph-mon@ceph-server
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sudo systemctl start ceph-mds@ceph-server
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Stopping a Daemon
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-----------------
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To stop a specific daemon instance on a Ceph Node, execute one of the
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following::
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sudo systemctl stop ceph-osd@{id}
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sudo systemctl stop ceph-mon@{hostname}
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sudo systemctl stop ceph-mds@{hostname}
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For example::
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sudo systemctl stop ceph-osd@1
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sudo systemctl stop ceph-mon@ceph-server
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sudo systemctl stop ceph-mds@ceph-server
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.. index:: Ceph service; Upstart; operating a cluster
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Running Ceph with Upstart
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=========================
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When deploying Ceph with ``ceph-deploy`` on Ubuntu Trusty, you may start and
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stop Ceph daemons on a :term:`Ceph Node` using the event-based `Upstart`_.
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Upstart does not require you to define daemon instances in the Ceph
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configuration file.
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To list the Ceph Upstart jobs and instances on a node, execute::
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sudo initctl list | grep ceph
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See `initctl`_ for additional details.
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Starting all Daemons
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--------------------
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To start all daemons on a Ceph Node (irrespective of type), execute the
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following::
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sudo start ceph-all
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Stopping all Daemons
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--------------------
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To stop all daemons on a Ceph Node (irrespective of type), execute the
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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 on a Ceph Node, execute one of the
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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 on a Ceph Node, execute one of the
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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 on a Ceph Node, execute one of the
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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 on a Ceph Node, execute one of the
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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
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============
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Each time you to **start**, **restart**, and **stop** Ceph daemons (or your
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entire cluster) you must specify at least one option and one command. You may
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also specify a daemon type or a daemon instance. ::
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{commandline} [options] [commands] [daemons]
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The ``ceph`` 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`` 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
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by adding a particular daemon type for the ``[daemons]`` option. Daemon types
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include:
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- ``mon``
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- ``osd``
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- ``mds``
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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
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