Chapter 2. Process Management
Each time you want to start, restart, and stop the Ceph daemons, you must specify the daemon type or the daemon instance.
2.1. Running Ceph as a systemd Service
In Red Hat Ceph Storage 2, all process management is done through the Systemd service.
2.1.1. Starting, Stopping, Restarting All Daemons
To start, stop, or restart all the Ceph daemons, execute the following commands from the local node running the Ceph daemons, and as root:
Start All Ceph Daemons
# systemctl start ceph.target
Stop All Ceph Daemons
# systemctl stop ceph.target
Restart All Ceph Daemons
# systemctl restart ceph.target
2.1.2. Starting, Stopping, Restarting All Daemons by Type
To start, stop, or restart all Ceph daemons of a particular type, execute the following commands from the local node running the Ceph daemons, and as root:
All Monitor Daemons
Starting:
# systemctl start ceph-mon.target
Stopping:
# systemctl stop ceph-mon.target
Restarting:
# systemctl restart ceph-mon.target
All OSD Daemons
Starting:
# systemctl start ceph-osd.target
Stopping:
# systemctl stop ceph-osd.target
Restarting:
# systemctl restart ceph-osd.target
All RADOS Gateway Daemons
Starting:
# systemctl start ceph-radosgw.target
Stopping:
# systemctl stop ceph-radosgw.target
Restarting:
# systemctl restart ceph-radosgw.target
2.1.3. Starting, Stopping, Restarting a Daemon by Instances
To start, stop, or restart a Ceph daemon of a particular type by instance, execute the following commands from the local node running the Ceph daemons, and as root:
Monitor Instance
Starting:
# systemctl start ceph-mon@<monitor_hostname>
Stopping:
# systemctl stop ceph-mon@<monitor_hostname>
Restarting:
# systemctl restart ceph-mon@<monitor_hostname>
OSD Instance
Starting:
# systemctl start ceph-osd@<OSD_number>
Stopping:
# systemctl stop ceph-osd@<OSD_number>
Restarting:
# systemctl restart ceph-osd@<OSD_number>
RADOS Gateway Instance
Starting:
# systemctl start ceph-radosgw@rgw.<gateway_hostname>
Stopping:
# systemctl stop ceph-radosgw@rgw.<gateway_hostname>
Restarting:
# systemctl restart ceph-radosgw@rgw.<gateway_hostname>
