On Wed, Apr 29, 2020 at 9:27 AM Ron Gage <ron(a)rongage.org> wrote:
Hi everyone!
I have been working for the past week or so trying to get ceph-iscsi to
work - Octopus release. Even just getting a single node working would be a
major victory in this battle but so far, victory has proven elusive.
My setup: a pair of Dell Optiplex 7010 desktops, each with 16 gig of
memory and 1 boot drive (USB 3) and 3 SATA drives (500 Gb SSHD drives). No
RAID controllers anywhere. Yes, I know that 3 nodes is the recommended
minimum number for a production system - this isn't production (this is
just seeing if the darned thing will even work).
I am using Centos 8.1.1911 for the OS (4.18.0 kernel) with a basic or
minimal installation (no X-Window). Single Gigabit ethernet per node. I
have 2 MON and 2 Mgr installed and working, and I have a total of 6 OSDs
working. I created the RBD pool (named "rbd" per the published
instructions), creating it initially with 256 PGs (autoscale decided that
32 was a better choice - whatever). The cluster is green and all 6 OSDs are
green (up and in). All deployment is via cephadm and all containers are
running via podman.
Here is where things start to fall apart.
I was able to find RPM packages for targetcli and python-rtslib (called
python3-rtslib) but was not able to find tcmu-runner nor ceph-iscsi
packages. OK, no big deal. Time to head over to the manual install guide.
http://download.ceph.com/ceph-iscsi/3/rpm/el8/noarch/ for the latter.
I was able to build tcmu-runner, install it and
apparently it is running
(systemctl says it is active) so that appears to be OK.
The problem is getting rbd-target-gw and rbd-target-api to work. They
appear to build OK and of course, I am able to get them registered with
systemd. They universally fail when trying to run them (systemctl start
rbd-target-gw or systemctl start rbd-target-api). Both report failure.
Looking in journalctl -xe shows no hints at all regarding why they failed
(only that they did). Looking in /var/log/rbd-target-api/ show nothing at
all (no files). Likewise in /var/log/rbd-target-gw/ (no files).
HELP!!
Now, some possibly germane questions:
1) are any other Ceph services required for ceph-iscsi to work like
RADOSgw?
Nope.
2) since there are no apparent packages available for ceph-iscsi, can
anything be inferred to the production-readiness of
the subsystem?
See above.
3) are there any known errata or missing steps in the instructions for
getting ceph-iscsi to work?
Not to my knowledge.
Thanks!
Ron Gage
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--
Jason