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=====================
Operating a Cluster
=====================
.. index:: systemd; operating a cluster
Running Ceph with systemd
==========================
For all distributions that support systemd (CentOS 7, Fedora, Debian
Jessie 8 and later, SUSE), ceph daemons are now managed using native
systemd files instead of the legacy sysvinit scripts. For example::
sudo systemctl start ceph.target # start all daemons
sudo systemctl status ceph-osd@12 # check status of osd.12
To list the Ceph systemd units on a node, execute::
sudo systemctl status ceph\*.service ceph\*.target
Starting all Daemons
--------------------
To start all daemons on a Ceph Node (irrespective of type), execute the
following::
sudo systemctl start ceph.target
Stopping all Daemons
--------------------
To stop all daemons on a Ceph Node (irrespective of type), execute the
following::
sudo systemctl stop ceph\*.service ceph\*.target
Starting all Daemons by Type
----------------------------
To start all daemons of a particular type on a Ceph Node, execute one of the
following::
sudo systemctl start ceph-osd.target
sudo systemctl start ceph-mon.target
sudo systemctl start ceph-mds.target
Stopping all Daemons by Type
----------------------------
To stop all daemons of a particular type on a Ceph Node, execute one of the
following::
sudo systemctl stop ceph-mon\*.service ceph-mon.target
sudo systemctl stop ceph-osd\*.service ceph-osd.target
sudo systemctl stop ceph-mds\*.service ceph-mds.target
Starting a Daemon
-----------------
To start a specific daemon instance on a Ceph Node, execute one of the
following::
sudo systemctl start ceph-osd@{id}
sudo systemctl start ceph-mon@{hostname}
sudo systemctl start ceph-mds@{hostname}
For example::
sudo systemctl start ceph-osd@1
sudo systemctl start ceph-mon@ceph-server
sudo systemctl start ceph-mds@ceph-server
Stopping a Daemon
-----------------
To stop a specific daemon instance on a Ceph Node, execute one of the
following::
sudo systemctl stop ceph-osd@{id}
sudo systemctl stop ceph-mon@{hostname}
sudo systemctl stop ceph-mds@{hostname}
For example::
sudo systemctl stop ceph-osd@1
sudo systemctl stop ceph-mon@ceph-server
sudo systemctl stop ceph-mds@ceph-server
.. index:: Ceph service; Upstart; operating a cluster
Running Ceph with Upstart
=========================
When deploying Ceph with ``ceph-deploy`` on Ubuntu Trusty, you may start and
stop Ceph daemons on a :term:`Ceph Node` using the event-based `Upstart`_.
Upstart does not require you to define daemon instances in the Ceph
configuration file.
To list the Ceph Upstart jobs and instances on a node, execute::
sudo initctl list | grep ceph
See `initctl`_ for additional details.
Starting all Daemons
--------------------
To start all daemons on a Ceph Node (irrespective of type), execute the
following::
sudo start ceph-all
Stopping all Daemons
--------------------
To stop all daemons on a Ceph Node (irrespective of type), execute the
following::
sudo stop ceph-all
Starting all Daemons by Type
----------------------------
To start all daemons of a particular type on a Ceph Node, execute one of the
following::
sudo start ceph-osd-all
sudo start ceph-mon-all
sudo start ceph-mds-all
Stopping all Daemons by Type
----------------------------
To stop all daemons of a particular type on a Ceph Node, execute one of the
following::
sudo stop ceph-osd-all
sudo stop ceph-mon-all
sudo stop ceph-mds-all
Starting a Daemon
-----------------
To start a specific daemon instance on a Ceph Node, execute one of the
following::
sudo start ceph-osd id={id}
sudo start ceph-mon id={hostname}
sudo start ceph-mds id={hostname}
For example::
sudo start ceph-osd id=1
sudo start ceph-mon id=ceph-server
sudo start ceph-mds id=ceph-server
Stopping a Daemon
-----------------
To stop a specific daemon instance on a Ceph Node, execute one of the
following::
sudo stop ceph-osd id={id}
sudo stop ceph-mon id={hostname}
sudo stop ceph-mds id={hostname}
For example::
sudo stop ceph-osd id=1
sudo start ceph-mon id=ceph-server
sudo start ceph-mds id=ceph-server
.. index:: Ceph service; sysvinit; operating a cluster
Running Ceph
============
Each time you to **start**, **restart**, and **stop** Ceph daemons (or your
entire cluster) you must specify at least one option and one command. You may
also specify a daemon type or a daemon instance. ::
{commandline} [options] [commands] [daemons]
The ``ceph`` options include:
+-----------------+----------+-------------------------------------------------+
| Option | Shortcut | Description |
+=================+==========+=================================================+
| ``--verbose`` | ``-v`` | Use verbose logging. |
+-----------------+----------+-------------------------------------------------+
| ``--valgrind`` | ``N/A`` | (Dev and QA only) Use `Valgrind`_ debugging. |
+-----------------+----------+-------------------------------------------------+
| ``--allhosts`` | ``-a`` | Execute on all nodes 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`` 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``
.. _Valgrind: http://www.valgrind.org/
.. _Upstart: http://upstart.ubuntu.com/index.html
.. _initctl: http://manpages.ubuntu.com/manpages/raring/en/man8/initctl.8.html
|
