Every component of Ceph, whether it's MON, OSD, MDS, or RGW, runs as a service on top of an underlying operating system. As a Ceph storage administrator, you should know about the Ceph services and how to operate them. On Red-Hat-based distributions, Ceph daemons can be managed in different ways: as a traditional SYSVINIT or as a service. Each time you 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. The general syntax for this is as follows:
{ceph service command} [options] [command] [daemons]
The Ceph options include:
--verboseor-v: This is for verbose logging.--valgrind: (It's used for Dev and QA only.) This is for valgrind debugging.--allhostsor-a: This executes on all nodes that are mentioned inceph.conf, otherwise on localhost.--confor-c: This is to use and alternate the configuration file.--restart: Automatically restarts the daemon if it core dumps.--norestart: This command says to not restart the daemon if it core dumps.
The Ceph commands include the following:
status: Shows status of the daemonstart: Starts the daemonstop: Stops the daemonrestart: Stops and then starts the daemonforcestop: Forces the daemon to stop; similar tokill-9killall: Kills all daemons of a particular typecleanlogs: Cleans out the log directorycleanalllogs: Cleans out everything in the log directory
The Ceph daemons include the following:
monosdmsd
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