[Gluster-infra] Migrating Gerrit and Jenkins out of iWeb

[Kaushal M]

On Feb 12, 2016 10:50 PM, "Kaushal M" <kshlmster at gmail.com> wrote:
>
> On Fri, Feb 12, 2016 at 10:47 PM, Michael Scherer <mscherer at redhat.com>
wrote:
> > Le vendredi 12 février 2016 à 12:16 +0100, Michael Scherer a écrit :
> >> Le mercredi 10 février 2016 à 19:18 +0530, Kaushal M a écrit :
> >> > On Wed, Feb 10, 2016 at 1:53 PM, Michael Scherer <mscherer at redhat.com>
wrote:
> >> > > Le mercredi 10 février 2016 à 11:44 +0530, Kaushal M a écrit :
> >> > >> On Sun, Feb 7, 2016 at 2:34 PM, Michael Scherer <
mscherer at redhat.com> wrote:
> >> > >> > Le samedi 06 février 2016 à 18:17 -0500, Vijay Bellur a écrit :
> >> > >> >> I think starting around 0900 UTC on Friday of next week (12th
Feb)
> >> > >> >> should be possible. We should be done with 3.7.8 before that
and can
> >> > >> >> afford a bit of downtime then. In case any assistance is
needed post the
> >> > >> >> migration, we can have folks around the clock to help.
> >> > >> >>
> >> > >> >> If migration fails for an unforeseen reason, would we be able
to
> >> > >> >> rollback and maintain status quo?
> >> > >> >
> >> > >> > Yes. Worst case, I think people would just redo a few reviews
or push
> >> > >> > again patch.
> >> > >> >
> >> > >> > Also, since gerrit is critical, I wonder what is the support of
gerrit
> >> > >> > for slaves and replication.
> >> > >>
> >> > >> Michael are you okay with the time? If you are, I think we should
> >> > >> announce the migration.
> >> > >
> >> > > I am ok.
> >> >
> >> > So as discussed in the community meeting, we will be announcing the
> >> > migration and downtime. Vijay, you said you required the exact
> >> > schedule? This is what I expect
> >> >
> >> > Friday 12th Feb 2016
> >> >
> >> > 0900 UTC : build.gluster.org and review.gluster.org are taken down
and
> >> > migration begins.
> >> > <1-2 hrs?>: Michael copies over data onto the RH community infra and
> >> > sets up the VMs.
> >> > <? hrs>: The DNS records are updated, and some time is for it to
propogate.
> >> > <3hr?>: Verify everything is working well (I can help with this).
We'd
> >> > possibly need to run a regression job, so this will take longest I
> >> > think.
> >> >
> >> > 1700UTC <or earlier>: We announce the finish of the migration and
open
> >> > the services back up. If migration failed, we bring the existing
> >> > servers back on, and continue on.
> >>
> >> So, for people wanting to know, the migration has started.
> >>
> >> 1) gerrit
> >> ----------
> >> gerrit seems to be ok, it has a new IP 66.187.224.201
> >>
> >> people who used to have access there need to contact me so I can
> >> explain/create required account on the new virt host.
> >>
> >> the old VM is shutdown for now. I will make a backup copy of the disk.
> >>
> >> 2) jenkins
> >> ----------
> >>
> >> so the preparation of the migration didn't worked as well, so we have
to
> >> copy the VM when offline, and then prepare it later ( ie, import in
> >> libvirt, adjust network, etc). So jenkins master is offline (sorry manu
> >> for your tcpdump monitoring), we are making a copy of the disk that is
> >> gonna take between 3 and 14h (most likely < 4h, but rsync estimation is
> >> moving a lot), and then restart like before.
> >
> > So turn out I was wrong, and the copy is taking a much longer time.
> > Despites me trying to investigate why, it didn't copied everything.
> >
> > So the new plan is to stop the VM, make a local copy of the disk, start
> > the VM, and then copy that one over the new server, prepare for the new
> > host (firewall, public ip, etc), and sync from the old VM to the new
> > host.
> >
> > All is ok with this plan ?
>
> Sounds good to me. No need to wait for the copy to happen and the
> downtime should be minimal like with gerrit.
>

Can we schedule this minimal downtime sometime tomorrow? Or if possible
tonight itself. Since we don't require a long downtime we can do this
anytime we like.

I'd like to get the migration done by the end of this week (if possible)
before Michael goes on vacation.

> > --
> > Michael Scherer
> > Sysadmin, Community Infrastructure and Platform, OSAS
> >
> >
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