capacity for more slaves

Fri May 13 11:04:11 UTC 2016

Hello David.

Forgot one "A". So it is SLAAC a scheme where IP address of the host in
IPv6 is generated from the mac address by the host itself and so it is
stateless at that sense and does not require keeping IP to MAC database
anywhere. Also unless privacy extension is enabled the machine will get the
same IP address always if it keeps the same MAC.

Routing prefix in this case comes from either DHCP or from the router using
router solicitation - but all of that are not required to keep any MAC
databases either.

BTW there are also IPv6 link-local addresses that are autogenerated the
same way but does not require any routeing prefixes as they work over the
local network only. Those can also be used for the slaves if we sure they
are in the same LAN. The good point is that they do not require any
intermediates for anything and typical pattern for DNS is using mDNS that
does not require centralized DNS servers either since it is LAN only.

Some patterns for IPv6 deployment use both global and link-local addresses
together.

https://en.wikipedia.org/wiki/IPv6_address#Stateless_address_autoconfiguration

Anton.

On Fri, May 13, 2016 at 12:55 PM, dcaro at redhat com <dcaro at redhat.com> wrote:

> On 05/13 10:50, Anton Marchukov wrote:
> > Hello All.
> >
> > Then I suggest consider rolling out IPv6 for the slaves right away
> > especially since it was declared a goal for oVirt 4. This can also
> simplify
> > slaves management as we can use SLAC for IP assignment and can solve that
> > DHCP update problems we had in foreman due to stale mac addresses etc..
> the
> > mac will be coming directly from oVirt mac pools and then SLAC will setup
> > an IP and we can autoregister in DNS.
>
>
> What is SLAC?
>
> >
> > Anton.
> >
> > On Fri, May 13, 2016 at 10:37 AM, dcaro at redhat com <dcaro at redhat.com>
> wrote:
> >
> > > On 05/13 09:10, Anton Marchukov wrote:
> > > > Hello All.
> > > >
> > > > Are those IPs are used by any tests or the jobs itself?
> > >
> > > Are used by the slaves themselves (each slave has one ip), not really
> > > needed
> > > for anything (the slaves are not contacted by any outside machine nor
> > > offering
> > > any service)
> > >
> > > >
> > > > Anton.
> > > >
> > > > On Fri, May 13, 2016 at 9:03 AM, David Caro Estevez <
> dcaroest at redhat.com
> > > >
> > > > wrote:
> > > >
> > > > > One possibility that will give us a lot of ips is using internal
> ones,
> > > > > though it will require a bit more configuration but now that the
> > > jenkins
> > > > > master is in phx I think it might be a good option
> > > > >
> > > > > David Caro
> > > > > El 13 may. 2016 7:57, Eyal Edri <eedri at redhat.com> escribió:
> > > > >
> > > > > Please open a ticket in jira on extending the ip range,  i guess we
> > > need
> > > > > to handle ir soon
> > > > > On May 12, 2016 8:58 PM, "Nadav Goldin" <ngoldin at redhat.com>
> wrote:
> > > > >
> > > > >> sure, added 4 more FC23 slaves, and on the way hit the IPs limit,
> > > > >> had to remove some old unused testing VMs to release IPs.
> > > > >> we have some useless leases there such as an IP for each template,
> > > > >> though I'm not 100% sure if its safe to simply delete them from
> > > foreman
> > > > >> (they are saved as templates in the engine, so theoretically
> shouldn't
> > > > >> be a problem)
> > > > >>
> > > > >>
> > > > >>
> > > > >>
> > > > >> On Thu, May 12, 2016 at 4:53 PM, David Caro <dcaro at redhat.com>
> wrote:
> > > > >>
> > > > >>> On 05/12 16:50, Nadav Goldin wrote:
> > > > >>> > ok I'll add also FC23, though I think the problem is the vdsm
> jobs,
> > > > >>> not sure
> > > > >>> > why they use only fc* instead of the el7 ones
> > > > >>>
> > > > >>> Thanks man, that's because (at least the check-merged) use
> libvirt to
> > > > >>> start up
> > > > >>> vms, and trying to use libvirt from a fc23 chroot on an el7 host
> > > ends up
> > > > >>> in
> > > > >>> error, so they have to run on fc23/21 slaves
> > > > >>>
> > > > >>> >
> > > > >>> > On Thu, May 12, 2016 at 4:33 PM, David Caro <dcaro at redhat.com>
> > > wrote:
> > > > >>> >
> > > > >>> > > On 05/12 12:46, Nadav Goldin wrote:
> > > > >>> > > > Hi, I added few more el7 slaves, there is a (relatively)
> new
> > > > >>> template
> > > > >>> > > > 'centos72-jenkins-slave' in the Jenkins_CentOS cluster.
> > > > >>> > > > iirc there was a discussion few months ago about our IPs
> > > limit, I
> > > > >>> think
> > > > >>> > > > we're approaching that(there are
> > > > >>> > > > 102 fixed addresses in foreman.phx.ovirt.org dhcpd
> server, and
> > > > >>> this is
> > > > >>> > > > without the old ovirt-srv* which are not managed there)
> > > > >>> > >
> > > > >>> > > Actually, we are scarce on fc23 slaves, not el (right now we
> > > have 28
> > > > >>> idle
> > > > >>> > > el7
> > > > >>> > > slaves, and I've been waiting for more than 45min for a lago
> > > > >>> check-patch to
> > > > >>> > > start on a fc23 slave)
> > > > >>> > >
> > > > >>> > > >
> > > > >>> > > >
> > > > >>> > > > On Tue, May 10, 2016 at 7:04 PM, David Caro <
> dcaro at redhat.com>
> > > > >>> wrote:
> > > > >>> > > >
> > > > >>> > > > > On 05/10 18:02, David Caro wrote:
> > > > >>> > > > > > On 05/10 18:53, Eyal Edri wrote:
> > > > >>> > > > > > > Looking at the load on our hypervisors I'm sure we
> can
> > > add
> > > > >>> more
> > > > >>> > > slaves
> > > > >>> > > > > to
> > > > >>> > > > > > > jenkins.
> > > > >>> > > > > > > Is there a documented procedure on how to add a new
> > > slave so
> > > > >>> > > anyone in
> > > > >>> > > > > the
> > > > >>> > > > > > > team can do it?
> > > > >>> > > > > > >
> > > > >>> > > > > >
> > > > >>> > > > > > I remember writing something about the templates and
> such,
> > > > >>> will look
> > > > >>> > > for
> > > > >>> > > > > it.
> > > > >>> > > > > >
> > > > >>> > > > > > Though it might be a bit old, not sure if we have
> changed
> > > > >>> anything in
> > > > >>> > > > > the last
> > > > >>> > > > > > months, maybe someone has newer info.
> > > > >>> > > > >
> > > > >>> > > > >
> > > > >>> > > > > There's some docs here:
> > > > >>> > > > >
> > > > >>> > > > >
> > > > >>> > > > >
> > > > >>> > >
> > > > >>>
> > >
> http://ovirt-infra-docs.readthedocs.io/en/latest/Phoenix_Lab/oVirt_Hosts.html#ovirt-datacenter-organization
> > > > >>> > > > >
> > > > >>> > > > > >
> > > > >>> > > > > > >
> > > > >>> > > > > > >
> > > > >>> > > > > > >
> > > > >>> > > > > > >
> > > > >>> > > > > > > --
> > > > >>> > > > > > > Eyal Edri
> > > > >>> > > > > > > Associate Manager
> > > > >>> > > > > > > RHEV DevOps
> > > > >>> > > > > > > EMEA ENG Virtualization R&D
> > > > >>> > > > > > > Red Hat Israel
> > > > >>> > > > > > >
> > > > >>> > > > > > > phone: +972-9-7692018
> > > > >>> > > > > > > irc: eedri (on #tlv #rhev-dev #rhev-integ)
> > > > >>> > > > > >
> > > > >>> > > > > > > _______________________________________________
> > > > >>> > > > > > > Infra mailing list
> > > > >>> > > > > > > Infra at ovirt.org
> > > > >>> > > > > > > http://lists.ovirt.org/mailman/listinfo/infra
> > > > >>> > > > > >
> > > > >>> > > > > >
> > > > >>> > > > > > --
> > > > >>> > > > > > David Caro
> > > > >>> > > > > >
> > > > >>> > > > > > Red Hat S.L.
> > > > >>> > > > > > Continuous Integration Engineer - EMEA ENG
> Virtualization
> > > R&D
> > > > >>> > > > > >
> > > > >>> > > > > > Tel.: +420 532 294 605
> > > > >>> > > > > > Email: dcaro at redhat.com
> > > > >>> > > > > > IRC: dcaro|dcaroest@{freenode|oftc|redhat}
> > > > >>> > > > > > Web: www.redhat.com
> > > > >>> > > > > > RHT Global #: 82-62605
> > > > >>> > > > >
> > > > >>> > > > >
> > > > >>> > > > >
> > > > >>> > > > > > _______________________________________________
> > > > >>> > > > > > Infra mailing list
> > > > >>> > > > > > Infra at ovirt.org
> > > > >>> > > > > > http://lists.ovirt.org/mailman/listinfo/infra
> > > > >>> > > > >
> > > > >>> > > > >
> > > > >>> > > > > --
> > > > >>> > > > > David Caro
> > > > >>> > > > >
> > > > >>> > > > > Red Hat S.L.
> > > > >>> > > > > Continuous Integration Engineer - EMEA ENG
> Virtualization R&D
> > > > >>> > > > >
> > > > >>> > > > > Tel.: +420 532 294 605
> > > > >>> > > > > Email: dcaro at redhat.com
> > > > >>> > > > > IRC: dcaro|dcaroest@{freenode|oftc|redhat}
> > > > >>> > > > > Web: www.redhat.com
> > > > >>> > > > > RHT Global #: 82-62605
> > > > >>> > > > >
> > > > >>> > > > > _______________________________________________
> > > > >>> > > > > Infra mailing list
> > > > >>> > > > > Infra at ovirt.org
> > > > >>> > > > > http://lists.ovirt.org/mailman/listinfo/infra
> > > > >>> > > > >
> > > > >>> > > > >
> > > > >>> > >
> > > > >>> > > > _______________________________________________
> > > > >>> > > > Infra mailing list
> > > > >>> > > > Infra at ovirt.org
> > > > >>> > > > http://lists.ovirt.org/mailman/listinfo/infra
> > > > >>> > >
> > > > >>> > >
> > > > >>> > > --
> > > > >>> > > David Caro
> > > > >>> > >
> > > > >>> > > Red Hat S.L.
> > > > >>> > > Continuous Integration Engineer - EMEA ENG Virtualization R&D
> > > > >>> > >
> > > > >>> > > Tel.: +420 532 294 605
> > > > >>> > > Email: dcaro at redhat.com
> > > > >>> > > IRC: dcaro|dcaroest@{freenode|oftc|redhat}
> > > > >>> > > Web: www.redhat.com
> > > > >>> > > RHT Global #: 82-62605
> > > > >>> > >
> > > > >>>
> > > > >>> --
> > > > >>> David Caro
> > > > >>>
> > > > >>> Red Hat S.L.
> > > > >>> Continuous Integration Engineer - EMEA ENG Virtualization R&D
> > > > >>>
> > > > >>> Tel.: +420 532 294 605
> > > > >>> Email: dcaro at redhat.com
> > > > >>> IRC: dcaro|dcaroest@{freenode|oftc|redhat}
> > > > >>> Web: www.redhat.com
> > > > >>> RHT Global #: 82-62605
> > > > >>>
> > > > >>
> > > > >>
> > > > > _______________________________________________
> > > > > Infra mailing list
> > > > > Infra at ovirt.org
> > > > > http://lists.ovirt.org/mailman/listinfo/infra
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Anton Marchukov
> > > > Senior Software Engineer - RHEV CI - Red Hat
> > >
> > > --
> > > David Caro
> > >
> > > Red Hat S.L.
> > > Continuous Integration Engineer - EMEA ENG Virtualization R&D
> > >
> > > Tel.: +420 532 294 605
> > > Email: dcaro at redhat.com
> > > IRC: dcaro|dcaroest@{freenode|oftc|redhat}
> > > Web: www.redhat.com
> > > RHT Global #: 82-62605
> > >
> >
> >
> >
> > --
> > Anton Marchukov
> > Senior Software Engineer - RHEV CI - Red Hat
>
> --
> David Caro
>
> Red Hat S.L.
> Continuous Integration Engineer - EMEA ENG Virtualization R&D
>
> Tel.: +420 532 294 605
> Email: dcaro at redhat.com
> IRC: dcaro|dcaroest@{freenode|oftc|redhat}
> Web: www.redhat.com
> RHT Global #: 82-62605
>

-- 
Anton Marchukov
Senior Software Engineer - RHEV CI - Red Hat
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/infra/attachments/20160513/46983738/attachment.html>