[ceph-users] Ceph version upgrade with Juju

James Page james.page at canonical.com
Mon Oct 8 05:53:14 PDT 2018


Hi Fabio

On Thu, 4 Oct 2018 at 23:02 Fabio Abreu <fabioabreureis at gmail.com> wrote:

> Hi Cephers,
>
> I have  a little  doubt about the migration of Jewel version in the MAAS /
> JUJU implementation scenario .
>
> Could someone has the same experience in production environment?
>

> I am asking this because we mapping all challenges of this scenario.
>

The ceph-mon and ceph-osd charms for Juju support upgrading between Ceph
releases; the upgrade is a rolling upgrade, orchestrated through keys
managed via the Ceph MON cluster itself.

The upgrade triggers are based around the Ubuntu Cloud Archive pockets that
also host Ceph (see [0]), so its possible to online upgrade using the
charms from:

  firefly -> hammer
  hammer -> jewel
  jewel -> luminous

we're working on the upgrade from luminous to mimic at the moment (but that
should not be a heavy lift so should land real-soon-now).

If you are currently deployed on Xenial (which shipped with Jewel), you can
upgrade directly to Luminous by re-configuring the charms:

  juju config ceph-mon source=cloud:xenial-pike

once that has completed (juju status output will tell you when):

  juju config ceph-osd source=cloud:xenial-pike

I'd recommend testing the upgrade in some sort of pre-production testing
environment first!

HTH

James

(ceph-* charm contributor and user)

[0] https://github.com/openstack/charms.ceph/blob/master/ceph/utils.py#L2539
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