Dear Cephalopodians, further experiments revealed that the crush-location-hook is indeed called! It's just my check (writing to a file in tmp from inside the hook) which somehow failed. Using "logger" works for debugging. So now, my hook outputs: host=osd001 datacenter=FTD root=default as explained before. I have also explicitly created the buckets beforehand in case that is needed. Tree looks like that: # ceph osd tree ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF -1 55.23582 root default -9 0 datacenter FTD -12 18.41194 datacenter FTD_1 -3 18.41194 host osd001 0 hdd 3.68239 osd.0 up 1.00000 1.00000 1 hdd 3.68239 osd.1 up 1.00000 1.00000 2 hdd 3.68239 osd.2 up 1.00000 1.00000 3 hdd 3.68239 osd.3 up 1.00000 1.00000 4 hdd 3.68239 osd.4 up 1.00000 1.00000 -11 0 datacenter FTD_2 -5 18.41194 host osd002 5 hdd 3.68239 osd.5 up 1.00000 1.00000 6 hdd 3.68239 osd.6 up 1.00000 1.00000 7 hdd 3.68239 osd.7 up 1.00000 1.00000 8 hdd 3.68239 osd.8 up 1.00000 1.00000 9 hdd 3.68239 osd.9 up 1.00000 1.00000 -7 18.41194 host osd003 10 hdd 3.68239 osd.10 up 1.00000 1.00000 11 hdd 3.68239 osd.11 up 1.00000 1.00000 12 hdd 3.68239 osd.12 up 1.00000 1.00000 13 hdd 3.68239 osd.13 up 1.00000 1.00000 14 hdd 3.68239 osd.14 up 1.00000 1.00000 So naively, I would expect that when I restart osd.0, it should move itself into datacenter=FTD. But that does not happen... Any idea what I am missing? Cheers, Oliver Am 30.11.18 um 11:44 schrieb Oliver Freyermuth:
Dear Cephalopodians, I'm probably missing something obvious, but I am at a loss here on how to actually make use of a customized crush location hook. I'm currently on "ceph version 13.2.1" on CentOS 7 (i.e. the last version before the upgrade-preventing bugs). Here's what I did: 1. Write a script /usr/local/bin/customized-ceph-crush-location. The script can be executed by user "ceph": # sudo -u ceph /usr/local/bin/customized-ceph-crush-location host=osd001 datacenter=FTD root=default 2. Add the following to ceph.conf: [osd] crush_location_hook = /usr/local/bin/customized-ceph-crush-location 3. Restart an OSD and confirm that is picked up: # systemctl restart ceph-osd@0 # ceph config show-with-defaults osd.0 ... crush_location_hook /usr/local/bin/customized-ceph-crush-location file ... osd_crush_update_on_start true default ... However, the script is not executed, and I can ensure that since the script should also write a log to /tmp, which is not created. Also, the "datacenter" type does not show up in the crush tree. I have already disabled SELinux just to make sure. Any ideas what I am missing here? Cheers and thanks in advance, Oliver
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