When deploying Ceph Cuttlefish and beyond with ceph-deploy on Debian/Ubuntu distributions, you may start and stop Ceph daemons on a 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.
To start all daemons on a Ceph Node (irrespective of type), execute the following:
sudo start ceph-all
To stop all daemons on a Ceph Node (irrespective of type), execute the following:
sudo stop ceph-all
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
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
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
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
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:
Using traditional sysvinit is the recommended way to run Ceph with CentOS, Red Hat, Fedora, and SLES distributions. You may also use it for older distributions of Debian/Ubuntu.
To start your Ceph cluster, execute ceph with the start command. Use the following syntax:
sudo /etc/init.d/ceph [options] [start|restart] [daemonType|daemonID]
The following examples illustrates a typical use case:
sudo /etc/init.d/ceph -a start
Once you execute with -a (i.e., execute on all nodes), Ceph should begin operating.
To stop your Ceph cluster, execute ceph with the stop command. Use the following syntax:
sudo /etc/init.d/ceph [options] stop [daemonType|daemonID]
The following examples illustrates a typical use case:
sudo /etc/init.d/ceph -a stop
Once you execute with -a (i.e., execute on all nodes), Ceph should stop operating.
To start all Ceph daemons of a particular type on the local Ceph Node, use the following syntax:
sudo /etc/init.d/ceph start {daemon-type}
sudo /etc/init.d/ceph start osd
To start all Ceph daemons of a particular type on another node, use the following syntax:
sudo /etc/init.d/ceph -a start {daemon-type}
sudo /etc/init.d/ceph -a start osd
To stop all Ceph daemons of a particular type on the local Ceph Node, use the following syntax:
sudo /etc/init.d/ceph stop {daemon-type}
sudo /etc/init.d/ceph stop osd
To stop all Ceph daemons of a particular type on another node, use the following syntax:
sudo /etc/init.d/ceph -a stop {daemon-type}
sudo /etc/init.d/ceph -a stop osd
To start a Ceph daemon on the local Ceph Node, use the following syntax:
sudo /etc/init.d/ceph start {daemon-type}.{instance}
sudo /etc/init.d/ceph start osd.0
To start a Ceph daemon on another node, use the following syntax:
sudo /etc/init.d/ceph -a start {daemon-type}.{instance}
sudo /etc/init.d/ceph -a start osd.0
To stop a Ceph daemon on the local Ceph Node, use the following syntax:
sudo /etc/init.d/ceph stop {daemon-type}.{instance}
sudo /etc/init.d/ceph stop osd.0
To stop a Ceph daemon on another node, use the following syntax:
sudo /etc/init.d/ceph -a stop {daemon-type}.{instance}
sudo /etc/init.d/ceph -a stop osd.0
When you deploy Ceph Argonaut or Bobtail with mkcephfs, you operate Ceph as a service (you may also use sysvinit).
To start your Ceph cluster, execute ceph with the start command. Use the following syntax:
sudo service ceph [options] [start|restart] [daemonType|daemonID]
The following examples illustrates a typical use case:
sudo service ceph -a start
Once you execute with -a (i.e., execute on all nodes), Ceph should begin operating.
To stop your Ceph cluster, execute ceph with the stop command. Use the following syntax:
sudo service ceph [options] stop [daemonType|daemonID]
For example:
sudo service ceph -a stop
Once you execute with -a (i.e., execute on all nodes), Ceph should shut down.
To start all Ceph daemons of a particular type on the local Ceph Node, use the following syntax:
sudo service ceph start {daemon-type}
sudo service ceph start osd
To start all Ceph daemons of a particular type on all nodes, use the following syntax:
sudo service ceph -a start {daemon-type}
sudo service ceph -a start osd
To stop all Ceph daemons of a particular type on the local Ceph Node, use the following syntax:
sudo service ceph stop {daemon-type}
sudo service ceph stop osd
To stop all Ceph daemons of a particular type on all nodes, use the following syntax:
sudo service ceph -a stop {daemon-type}
sudo service ceph -a stop osd
To start a Ceph daemon on the local Ceph Node, use the following syntax:
sudo service ceph start {daemon-type}.{instance}
sudo service ceph start osd.0
To start a Ceph daemon on another node, use the following syntax:
sudo service ceph -a start {daemon-type}.{instance}
sudo service ceph -a start osd.0
To stop a Ceph daemon on the local Ceph Node, use the following syntax:
sudo service ceph stop {daemon-type}.{instance}
sudo service ceph stop osd.0
To stop a Ceph daemon on another node, use the following syntax:
sudo service ceph -a stop {daemon-type}.{instance}
sudo service ceph -a stop osd.0