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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
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In Red Hat Ceph Storage 2, all process management is done through the Systemd service.

2.1.1. Starting, Stopping, Restarting All Daemons
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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

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

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>
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