Re: New to Ceph - osd autostart problem

George Shuklin <george.shuklin@xxxxxxxxx> · Mon, 11 Jul 2016 15:49:39 +0300



    Short story how OSDs are started in
      systemd environments:

      
      Ceph OSD parittions has specific typecode (partition type 4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D).
        It handled by udev rules shipped by ceph package:

        /lib/udev/rules.d/95-ceph-osd.rules

        
        It set up proper owner/group for this disk ('ceph' instead
        'root') and calls /usr/sbin/ceph-disk trigger.

        
        ceph-disk triggers creation of instance of ceph-disk@ systemd
        unit (to mount disk to /var/lib/ceph/osd/...), and ceph-osd@
        (i'm not sure about all sequence of events).

        
        Basically, to make OSD autostart they NEED to have proper
        typecode in their partition. If you using something different
        (like 'directory based OSD') you should enable OSD autostart:

        
        systemctl enable ceph-osd@42

        
      On 07/11/2016 03:32 PM, Dirk Laurenz wrote:

    
    Hello,
      

      i'm new to ceph an try to do some first steps with ceph to
      understand concepts.
      

      my setup is at first completly in vm....
      

      i deployed (with ceph-deploy) three monitors and three osd hosts.
      (3+3 vms)
      

      my frist test was to find out, if everything comes back online
      after a system restart. this works fine for the monitors, but
      fails for the osds. i have to start them manually.
      

      OS is debian jessie, ceph is the current release....
      

      Where can find out, what's going wrong....
      

      Dirk
      

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