Hi, thanks for your support so far.
I disabled the ipv6 auto config and have chosen “ipv6 link local only” in nmtui network manager. I discovered that there is only one ipv4 dns entry in /etc/resolv.conf then (because the ipv6 dhcp-server is no longer asked). This setting solves my issue and everything worked just fine.

Here is your requested supervdsm snippet:

https://jan-home.de/public/ovirt/supervdsm.log

Greetings from Germany,

Jan

Von: Dominik Holler <dholler@redhat.com>
Gesendet: Montag, 14. September 2020 10:23
An: jan.kleefeld@jan-home.de
Cc: users <users@ovirt.org>; Ales Musil <amusil@redhat.com>; Yedidyah Bar David <didi@redhat.com>
Betreff: Re: [ovirt-users] Probably dns problem: Internal JSON-RPC error

On Sun, Sep 13, 2020 at 11:35 AM Yedidyah Bar David <didi@redhat.com> wrote:

On Sun, Sep 13, 2020 at 11:27 AM <jan.kleefeld@jan-home.de> wrote:
>
> I have a clean installed CentOS 8.2 2004 on my server. The self hosted engine deploy (ovirt-4.4) aborts with the following message:
>
> [ ERROR ] fatal: [localhost]: FAILED! => {"changed": false, "msg": "The host has been set in non_operational status, deployment errors: code 505: Host red.colors.ovirt.local installation failed. Failed to configure management network on the host., code 1120: Failed to configure management network on host red.colors.ovirt.local due to setup networks failure., code 9000: Failed to verify Power Management configuration for Host red.colors.ovirt.local., code 10802: VDSM red.colors.ovirt.local command HostSetupNetworksVDS failed: Internal JSON-RPC error:
> {'reason': '
> desired
> =======
> ---
> dns-resolver:
>  search: []
>  server:
>  - 192.168.2.150
>  - fe80::1%eno1
>
>  current
>  =======
>  ---
>  dns-resolver:
>  search: []
>  server:
>  - 192.168.2.150
>
>  difference
>  ==========
>  --- desired
>  +++ current
>  @@ -3,4 +3,3 @@
>  search: []
>  server:
>  - 192.168.2.150
>  - - fe80::1%eno1
>
>  '}, fix accordingly and re-deploy."}
>
> ~# cat /etc/resolv.conf
>      # Generated by NetworkManager
>      search colors.ovirt.local
>      nameserver 192.168.2.150
>      nameserver fe80::1%eno1
>
> I am confused, because the probalby missing line is present. Is there maybe another config file, where this last line could be missing?
> Maybe I can force somehow the installer, to reload the resolv conf, so it can fetch ne new line?

Can you please check/share other relevant logs (and perhaps other
parts of this one)? Perhaps upload somewhere and share a link, or open
a bug in bugzilla and attach there.

Adding Dominik.

Perhaps we fail to parse the line 'nameserver fe80::1%eno1'?

Yes, IPv6 link local nameserver might not work for static IP addresses, but might work for dynamic.

Also mixing IPv4 and IPv6 nameservers might confuse lower layers.

Can you share at least the line containing

"call setupNetworks with "

and

"desired state"

of supervdsm.log?

Thanks and best regards,
--
Didi