Dear Sage,
Am 13.12.19 um 17:43 schrieb Sage Weil:
Ceph Octopus will be based on CentOS 8. It's due
out in March.
The centos8 transition is awkward because our python 2 dependencies don't
exist on in centos8, and it is a huge amount of effort to produce them.
Octopus switches to python 3, but those dependencies cannot be produces
for centos7. So the nautilus->octopus upgrade will be either involve a
transition to the new containerized deployment (either cephadm or
ceph-ansible's container mode) or a simultaneous upgrade of the OS and
Ceph.
is there already a migration approach with minimum downtime for the non-containerized
setup when using CephFS?
The problem I see would be that after reducing to a single active MDS per rank, upgrading
that "in place" would mean machine reinstallation.
Would the following approach work?
1. Reinstall a standby MDS (upgrading to CentOS 8 and Octopus), but do not start the
actual service yet.
2. Shut down all other MDS of that rank, and start the new MDS on the freshly installed
node.
This should minimize the downtime to the "failover time" as usual.
Should that work without issues?
If so, we'll try that out sometime summer next year on a less critical cluster ;-).
Cheers,
Oliver
sage
Regards
Manuel
On Mon, 2 Dec 2019 11:16:01 +0100
Jan Kasprzak <kas(a)fi.muni.cz> wrote:
Hello, Ceph users,
does anybody use Ceph on recently released CentOS 8? Apparently there
are no el8 packages neither at
download.ceph.com, nor in the native
CentOS package tree. I am thinking about upgrading my cluster to C8
(because of other software running on it apart from Ceph). Do el7
packages simply work? Can they be rebuilt using rpmbuild --rebuild?
Or is running Ceph on C8 more complicated than that?
Thanks,
-Yenya
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