On Wed, 27 Feb 2019 13:24:14 +0200
Juhani Rautiainen <juhani.rautiai...@gmail.com> wrote:

> On Wed, Feb 27, 2019 at 10:49 AM Dominik Holler <dhol...@redhat.com> wrote:
> >
> 
> > > I just copied that ifcfg-ovirtmgmt file from second node and fixed
> > > IP-address to correct one before doing ifdown/ifup. That file had
> > > changed to DHCP so my instinct was trying to correct that one.
> > >
> >
> > Please let oVirt doing the work for you. If you interface to oVirt is
> > the web UI, please use the dialog "Edit Managment Network: ovirtmgmt"
> > which opens by clicking on the pencil symbol next to ovirtmgmt in
> > Compute > Hosts > xxx > Network Interfaces > Setup Host Networks
> > This will enable oVirt to recognize this change as intended.
> 
> Problem was that oVirt couldn't do the work anymore. It had for some
> reason switched that node to using DHCP addresses. DHCP gave totally
> different address to the node which was not known by ovirt engine.
> This is why I tried above change because I had lost connections to
> node after the resync. I had to use HP ILO console to see what's going
> on and found out that it had switched to DHCP and had wrong. And it
> used ILO fencing to boot the server because it couldn't reach it
> (which took many aftive vm's down). After the boot it still couldn't
> connect because address was still given by DHCP.

You did the right thing to establish a temporary connection of host and
engine. As soon as the engine is able to communicate with the host,
oVirt's web ui (or REST-API) should be used to configure the management
network address and to ensure, that the host is in sync with oVirt's config.

> What I'm wondering
> why it switched to DHCP when it had had static since first minute?
> 

This is a valid question.

> > > I noticed that one node had ovirtmgmt network unsynchronized. I tried

oVirt detected a difference between the expected configuration and applied
configuration. This might happen if the interface configuration is change
directly on the host instead of using oVirt Engine.

> > > to resynchronize it.

If you have the vdsm.log, the relevant lines start at the pattern
Calling 'Host.setupNetworks'
and ends at the pattern
FINISH getCapabilities


> > > This led the node being rebooted by HP ILO. After
> > > reboot the node came up with DHCP address. 

I have no idea why this happened, maybe there is a trace
in /var/log/messages ?

VDSM would revert a change in management networking configuration,
if after the change communication to engine is broken.
But if the host is rebooted during the change, there might be a
problem.
If you think you triggered
Bug 1664106 - [Network] Host reboot while setup networks leads to host stuck on 
status 'connecting'
you logfiles would be very helpful, if they are attached to the bug.
Thanks!



> >
> > Maybe no required anymore, since you described very precise what you
> > did.
> 
> Or not clearly enough.
> 
> Thanks,
> -Juhani
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