Follow up - it does seem to be the tmpfs mount that activate creates that causes the problem.
I manually started the activate container by running the podman command from unit.run for the activate step, but just ran "bash -l" instead of the actual activate command Then I prevented the mount tmpfs from doing anything by "rm /usr/bin/mount" and replacing it with a link to "/usr/bin/true", and then ran the original activate command # /usr/sbin/ceph-volume lvm activate 2 56b13799-3ef5-4ea5-91d5-474f829f12dc --no-systemd Running command: /usr/bin/mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-2 <<< WHY DOES IT DO THIS? Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-2 Running command: /usr/bin/ceph-bluestore-tool --cluster=ceph prime-osd-dir --dev /dev/ceph-6fc7e3e3-2ce6-47ab-aac8-adc5c6633dfb/osd-block-56b13799-3ef5-4ea5-91d5-474f829f12dc --path /var/lib/ceph/osd/ceph-2 --no-mon-config Running command: /usr/bin/ln -snf /dev/ceph-6fc7e3e3-2ce6-47ab-aac8-adc5c6633dfb/osd-block-56b13799-3ef5-4ea5-91d5-474f829f12dc /var/lib/ceph/osd/ceph-2/block Running command: /usr/bin/chown -h ceph:ceph /var/lib/ceph/osd/ceph-2/block Running command: /usr/bin/chown -R ceph:ceph /dev/mapper/ceph--6fc7e3e3--2ce6--47ab--aac8--adc5c6633dfb-osd--block--56b13799--3ef5--4ea5--91d5--474f829f12dc Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-2 --> ceph-volume lvm activate successful for osd ID: 2 Because the tmpfs was now effectively a no-op, this activation created the necessary files in the real OSD directory, and now I was able to systemctl restart the osd service and now it came up apparently OK. I also did another fresh install on same hardware using normal non-ZFS root, and this problem did not happen, so it does in some way appear to be an interaction with ZFS. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1881747 Title: cephadm does not work with zfs root Status in zfs-linux package in Ubuntu: In Progress Bug description: When trying to install ceph on ubuntu 20.04 with zfs as root file system the OSD's do not come up. The OSD's give an error of: May 29 16:51:11 ip-10-0-0-148 systemd[1]: ceph-a3ed1cb2-a1cb-11ea-8daf-a729fb450032@osd.0.service: Main process exited, code=exited, status=1/FAILURE May 29 16:51:12 ip-10-0-0-148 systemd[1]: ceph-a3ed1cb2-a1cb-11ea-8daf-a729fb450032@osd.0.service: Failed with result 'exit-code'. May 29 16:51:22 ip-10-0-0-148 systemd[1]: ceph-a3ed1cb2-a1cb-11ea-8daf-a729fb450032@osd.0.service: Scheduled restart job, restart counter is at 4. May 29 16:51:22 ip-10-0-0-148 systemd[1]: Stopped Ceph osd.0 for a3ed1cb2-a1cb-11ea-8daf-a729fb450032. May 29 16:51:22 ip-10-0-0-148 systemd[1]: Starting Ceph osd.0 for a3ed1cb2-a1cb-11ea-8daf-a729fb450032... May 29 16:51:22 ip-10-0-0-148 docker[114525]: Error: No such container: ceph-a3ed1cb2-a1cb-11ea-8daf-a729fb450032-osd.0 May 29 16:51:22 ip-10-0-0-148 systemd[1]: Started Ceph osd.0 for a3ed1cb2-a1cb-11ea-8daf-a729fb450032. May 29 16:51:23 ip-10-0-0-148 bash[114543]: Running command: /usr/bin/mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-0 May 29 16:51:23 ip-10-0-0-148 bash[114543]: Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-0 May 29 16:51:23 ip-10-0-0-148 bash[114543]: Running command: /usr/bin/ceph-bluestore-tool --cluster=ceph prime-osd-dir --dev /dev/ceph-b3cf0dc5-a5fb-45c5-af3c-b85ef0b115ee/osd-block-3bfa4417-18e5-49f9-> May 29 16:51:23 ip-10-0-0-148 bash[114543]: Running command: /usr/bin/ln -snf /dev/ceph-b3cf0dc5-a5fb-45c5-af3c-b85ef0b115ee/osd-block-3bfa4417-18e5-49f9-95ee-4c5912f0fa22 /var/lib/ceph/osd/ceph-0/block May 29 16:51:23 ip-10-0-0-148 bash[114543]: Running command: /usr/bin/chown -h ceph:ceph /var/lib/ceph/osd/ceph-0/block May 29 16:51:23 ip-10-0-0-148 bash[114543]: Running command: /usr/bin/chown -R ceph:ceph /dev/mapper/ceph--b3cf0dc5--a5fb--45c5--af3c--b85ef0b115ee-osd--block--3bfa4417--18e5--49f9--95ee--4c5912f0fa22 May 29 16:51:23 ip-10-0-0-148 bash[114543]: Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-0 May 29 16:51:23 ip-10-0-0-148 bash[114543]: --> ceph-volume lvm activate successful for osd ID: 0 May 29 16:51:24 ip-10-0-0-148 bash[115166]: debug 2020-05-29T16:51:24.602+0000 7f05cfb9cec0 0 set uid:gid to 167:167 (ceph:ceph) May 29 16:51:24 ip-10-0-0-148 bash[115166]: debug 2020-05-29T16:51:24.602+0000 7f05cfb9cec0 0 ceph version 15.2.2 (0c857e985a29d90501a285f242ea9c008df49eb8) octopus (stable), process ceph-osd, pid 1 May 29 16:51:24 ip-10-0-0-148 bash[115166]: debug 2020-05-29T16:51:24.602+0000 7f05cfb9cec0 0 pidfile_write: ignore empty --pid-file May 29 16:51:24 ip-10-0-0-148 bash[115166]: debug 2020-05-29T16:51:24.602+0000 7f05cfb9cec0 -1 missing 'type' file and unable to infer osd type Using ubuntu 20.04 without root zfs works fine. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1881747/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
