[ovirt-users] Setting DNS servers problem on ovirt

Tue Nov 1 05:01:38 EDT 2016

On Tue, Nov 1, 2016 at 9:01 AM, Yedidyah Bar David <didi at redhat.com> wrote:

> On Tue, Nov 1, 2016 at 1:38 AM, Thing <thing.thing at gmail.com> wrote:
> > Hi,
> >
> > I have installed IPA across 3 nodes.  In order to point the ovirt server
> at
> > the new IPA/DNS servers and to clean up I ran engine-cleanup aiming to
> delte
> > the ovirt setup.   However it seems even though I ran this something,
> > "vdsm?" is still running and controlling the networking.
>
> engine-cleanup only cleans up the engine. It does nothing to the hosts.
> I am not aware of a similar "vdsm-cleanup" tool.
> In principle, you could have moved your hosts to maintenance and removed
> them
> from the engine. No idea what this would tell vdsm to do wrt to your
> question.
> It definitely would not undo ifcfg-* changes.
>
> >
> > So down under /etc/sysconfig/network-scripts I see,
> >
> > =========
> > /etc/sysconfig/network-scripts
> > [root at ovirt1 network-scripts]# ls -l
> > total 256
> > -rw-rw-r--. 1 root root   130 Nov  1 10:32 ifcfg-enp0s25
> > -rw-r--r--. 1 root root   254 Sep 16  2015 ifcfg-lo
> > -rw-rw-r--. 1 root root   252 Nov  1 10:32 ifcfg-ovirtmgmt
> > 8><-----
> > ==========
> >
> > So my first Q is why when I run engine-cleanup isnt the networking
> cleaned
> > up?  should I file this as a bugzilla?
>
> See above, it's not in the scope for engine-cleanup.
>
> >
> > After that I can see that ifcfg-ovirtmgmt is still controlling DNS,
> >
> > ==========
> > 8><----
> > [root at ovirt1 network-scripts]# tail ifcfg-ovirtmgmt
> > ONBOOT=yes
> > IPADDR=192.168.1.34
> > NETMASK=255.255.255.0
> > GATEWAY=192.168.1.1
> > BOOTPROTO=none
> > MTU=1500
> > DEFROUTE=yes
> > NM_CONTROLLED=no
> > IPV6INIT=no
> > DNS1=192.168.1.240
> > [root at ovirt1 network-scripts]#
> > ===========
> >
> > So I tried to set,
> >
> > DNS1=192.168.1.31
> > DNS2=192.168.1.32
> > DNS3=192.168.1.33
> >
> > rebooted and, no I see,
> >
> > DNS1=192.168.1.240 again
> >
> > So I also see that the vdsm service is still running,
> >
> > ==========
> > [root at ovirt1 network-scripts]# systemctl status vdsm-network.service
> > ● vdsm-network.service - Virtual Desktop Server Manager network
> restoration
> >    Loaded: loaded (/usr/lib/systemd/system/vdsm-network.service;
> enabled;
> > vendor preset: enabled)
> >    Active: active (exited) since Tue 2016-11-01 10:32:51 NZDT; 2h 0min
> ago
> >   Process: 2873 ExecStart=/usr/bin/vdsm-tool restore-nets (code=exited,
> > status=0/SUCCESS)
> >   Process: 2848 ExecStartPre=/usr/bin/vdsm-tool --vvverbose --append
> > --logfile=/var/log/vdsm/upgrade.log upgrade-unified-persistence
> > (code=exited, status=0/SUCCESS)
> >  Main PID: 2873 (code=exited, status=0/SUCCESS)
> >    CGroup: /system.slice/vdsm-network.service
> >
> > Nov 01 10:32:45 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> client
> > step 2
> > Nov 01 10:32:45 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> > parse_server_challenge()
> > Nov 01 10:32:45 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> > ask_user_info()
> > Nov 01 10:32:45 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> client
> > step 2
> > Nov 01 10:32:45 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> > ask_user_info()
> > Nov 01 10:32:45 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> > make_client_response()
> > Nov 01 10:32:45 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> client
> > step 3
> > Nov 01 10:32:51 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> client
> > mech dispose
> > Nov 01 10:32:51 ovirt1.ods.graywitch.co.nz python[2887]: DIGEST-MD5
> common
> > mech dispose
> > Nov 01 10:32:51 ovirt1.ods.graywitch.co.nz systemd[1]: Started Virtual
> > Desktop Server Manager network restoration.
> > [root at ovirt1 network-scripts]#
> > ===========
> >
> > why after cleaning up is this still active?
> >
> > Next, I have grep'd under /etc/ and cannot find where its getting its
> > obsolete network DNS info info from.
>
> I think it's somewhere under /var, adding Dan.
>

If VDSM is running, any network devices it used are owned by it.
Editing manually ifcfg files it owns will result in VDSM restoring them to
their persisted state
in vdsm configuration files.

I guess, you can just uninstall/remove vdsm and continue from there: sudo
yum remove -y vdsm\*

>
> >
> > So I need to know where this info is stored? so I can edit is via the
> CLI?
> > database?
> >
> > There is no web ui running as engine-cleanup has removed that so I cant
> work
> > via the web ui.
> >
> > Is there anything else I need to manually stop, disable and remove after
> > running engine-cleanup?
>
> See above.
>
> See also [1], which is for a hosted-engine host, not exactly your case
> but similar. You are welcome to comment there, and/or open another RFE
> bz for general hosts (not hosted-engine ones).
>
> I might be wrong, though - perhaps there is something to undo ifcfg*
> changes that I am unaware of. Dan?
>

There is automatic restoration for rollback scenarios, but these are
usually overwritten multiple times
for each successful setup. We just save the last good network setup and in
case of failure to a new setup
it is restored back to the good point.
I also do not see to much logic in allowing restoration to the 'before
vdsm' period. The network connections
of the hosts could have been changed from that time.

>
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=1001181
>
> Best,
> --
> Didi
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