Re: Problems getting ceph-iscsi to work

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On Wed, Apr 29, 2020 at 9:27 AM Ron Gage <ron@xxxxxxxxxxx> 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
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