[ovirt-users] Network issues on install

Mon Apr 4 09:29:12 UTC 2016

On Mon, Apr 4, 2016 at 11:11 AM, Yedidyah Bar David <didi at redhat.com> wrote:
> On Sat, Apr 2, 2016 at 8:14 PM, Brett I. Holcomb <biholcomb at l1049h.com> wrote:
>>
>> On Fri, 2016-04-01 at 21:39 -0400, Brett I. Holcomb wrote:
>>
>> Two items here.
>>
>> oVirt version 3.6.4  Fresh install, not an upgrade.
>>
>>
>> First, I noticed this issue when I did an install on a test machine but I
>> didn't have the data to present.  Because of that and some other posts
>> dealing with the network issue I kept notes when I installed on my
>> production system.   I'm doing a hosted-engine setup.
>>
>> As part of the preparation I did the following before installing and
>> deploying.
>>
>> * Removed NetworkManager with yum remove NetworkManager
>> * The NIC that will be used for the oVirt management NIC is connected to a
>> switch port expecting VLAN 50 so I set up a VLAN50 ifcfg file.
>> * The IP address of the  server, prefix, gateway, and TWO DNS servers were
>> setup in the ifcfg file. and name resolution worked.  I could ping the host
>> by name as well as the oVirt Engine VM which was in DNS so the name resolved
>> but obviously nothing would reply.  Other servers and workstations could
>> resolve the host and engine names.

The issue is just here:
explicit static DNS configuration under
/etc/sysconfig/network-scripts/ifcfg-* is currently not allowed by
VDSM (see https://bugzilla.redhat.com/show_bug.cgi?id=1160667 ).
So, if you are going to use static network configuration, please
remove DNS1, DNS2... lines from /etc/sysconfig/network-scripts/ifcfg-*
and just configure it with a nameserver line under /etc/resolv.conf
then systemctl restart network
Try deploying hosted-engine again: VDSM network configuration will not
touch /etc/resolv.conf and it will work.

>> 1.  On the host I ran hosted-engine --deploy and installed the OS (Centos 7
>> (1511) on the Engine VM.  I rebooted the Engine VM, told the deployment that
>> the Engine VM was running and it then continued and deployment told me to
>> install the engine on the Engine VM.
>> 2.  I updated the Engine VM via yum update,  installed the oVirt
>> repositories, and ran the engine-setup which completed successfully.
>> 3. I then went back to the host and told it the Engine was setup and at this
>> point things went bad.  The deployment started whining about not being able
>> to resolve myenginevm.mydomain.com host, did cleanup, per-termination,
>> termination, and said the deployment failed and the system was unreliable,
>> fix it,  whine, whine, whine.
>> 4.  I tried a ping on myenginevm.mydomain.com and it failed.
>>
>> What I found was that when the bridge was created (ifcfg-ovirtmgmt) the DNS
>> servers were left out!  They were in the original NIC ifcfg file but it
>> appears the deployment didn't bother to bring them over to the bridge ifcfg.
>> I find this very puzzling since the deployment insists on FQDNs so it should
>> be smart enough to bring over the DNS server settings and not leave them
>> out.  My /etc/resolv.conf file also had no DNS servers in it.
>>
>> I added the DNS server to the bridge ifcfg file, did a systemctl restart
>> network and all is well again.  The host can ping the VM!
>>
>> However, the deployment thinks it failed and I can not restart the Engine
>> VM.  I tried a reboot, made sure the ovirt daemons were running but if I try
>> and do anything such as hosted-engine vm-start I get  "Unable to read
>> vm.conf, please check ovirt-ha-agent logs".
>>
>> Second, I think that having the deployment fail simply because it can not
>> contact the Engine VM is a very huge error/bug/whatever - its silly.  The
>> deployment went well, the VM exists and is running but due to the deployment
>> messing up the DNS servers it just can't find it.  The deployment should
>> first, handle the name server setup correctly and second fail gracefully..
>>
>> I rebooted the server but still get the error about not being able to read
>> vm.conf.  At this point I now have to run through the entire deployment
>> again just because one phase messed up unless there is a way to work around
>> this.  However, in the work that I've done with oVirt I've notice the
>> deployment is not real robust and when it encounters errors that should
>> allow it to recover.  I suggest that consideration be given to making the
>> deployment smarter and more robust.
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>>
>>
>> More info.
>>
>> This gets broken during the hosted-engine --deploy first phase (before the
>> OS is installed on the Engine VM) which makes sense because I assume that's
>> when the bridge is created.
>>
>> I added another logical network with a VLAN tag and this broke name
>> resolution again.  I had to do systemctl restart network again and then name
>> resolution was back.
>>
>> I'm attempting to use the web portal but it's very/very slow.  When I select
>> the admin portal it can take 5+ minutes before it displays the login page if
>> it ever does and doesn't time out.  Once I get the Admin login it goes
>> pretty quickly.  I'm using Firefox 45.0.1 on Fedora 23.  Any reason for
>> this?  From what I see the message about not supporting the browser is
>> bogus.  My host has 64 gig memory, and E2620-v3 processor.
>
> Looks similar to [1]. Adding Simone.
>
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=1160423
> --
> Didi