[ovirt-users] More 4.1 Networking Questions

Mon Apr 10 08:27:52 UTC 2017

Adding Simone and Martin, replying inline.

On Mon, Apr 10, 2017 at 10:16 AM, Ondrej Svoboda <osvoboda at redhat.com>
wrote:

> Hello Charles,
>
> First, can you give us more information regarding the duplicated IPv6
> addresses? Since you are going to reinstall the hosted engine, could you
> make sure that NetworkManager is disabled before adding the second vNIC
> (and perhaps even disable IPv6 and reboot as well, so we have a solid base
> and see what makes the difference)?
>
> What kind of documentation did you follow to install the hosted engine?
> Was it this page? https://www.ovirt.org/documentation/how-to/hosted-
> engine/ If so, could you file a bug against VDSM networking and attach
> /var/log/vdsm/vdsm.log and supervdsm.log, and make sure they include the
> time period from adding the second vNIC to rebooting?
>
> Second, even the vNIC going missing after reboot looks like a bug to me.
> Even though eth1 does not exist in the VM, can you see it defined for the
> VM in the engine web GUI?
>

If the HE vm configuration wasn't flushed to the OVF_STORE yet, it make
sense it disappeared on restart.

>
> The steps you took to install the hosted engine with regards to networking
> look good to me, but I believe Sandro (CC'ed) would be able to give more
> advice.
>
> Sandro, since we want to configure bonding, would you recommend to install
> the engine physically first, move it to a VM, according to the following
> method, and only then reconfigure networking? https://www.ovirt.org/
> documentation/self-hosted/chap-Migrating_from_Bare_
> Metal_to_an_EL-Based_Self-Hosted_Environment/
>

I don't see why a diret HE deployment couldn't be done. Simone, Martin can
you help here?

>
>
> Thank you,
> Ondra
>
> On Mon, Apr 10, 2017 at 8:51 AM, Charles Tassell <ctassell at gmail.com>
> wrote:
>
>> Hi Everyone,
>>
>>   Okay, I'm again having problems with getting basic networking setup
>> with oVirt 4.1  Here is my situation.  I have two servers I want to use to
>> create an oVirt cluster, with two different networks.  My "public" network
>> is a 1G link on device em1 connected to my Internet feed, and my "storage"
>> network is a 10G link connected on device p5p1 to my file server.  Since I
>> need to connect to my storage network in order to do the install, I
>> selected p5p1 has the ovirtmgmt interface when installing the hosted
>> engine.  That worked fine, I got everything installed, so I used some
>> ssh-proxy magic to connect to the web console and completed the install
>> (setup a Storage domain and create a new network vmNet for VM networking
>> and added em1 to it.)
>>
>>   The problem was that when I added a second network device to the
>> HostedEngine VM (so that I can connect to it from my public network) it
>> would intermittently go down.  I did some digging and found some IPV6
>> errors in the dmesg (IPv6: eth1: IPv6 duplicate address
>> 2001:410:e000:902:21a:4aff:fe16:151 detected!) so I disabled IPv6 on
>> both eth0 and eth1 in the HostedEngine and rebooted it.  The problem is
>> that when I restarted the VM, the eth1 device was missing.
>>
>>   So, my question is: Can I add a second NIC to the HostedEngine VM and
>> make it stick, or will it be deleted whenever the engine VM is restarted?
>
>
When you change something in the HE Vm using the web ui, it has to be saved
also on the OVF_STORE to make it permanent for further reboot.
Martin can you please elaborate here?

> Is there a better way to do what I'm trying to do, ie, should I setup
>> ovirtmgmt on the public em1 interface, and then create the "storage"
>> network after the fact for connecting to the datastores and such.  Is that
>> even possible, or required?  I was thinking that it would be better for
>> migrations and other management functions to happen on the faster 10G
>> network, but if the HostedEngine doesn't need to be able to connect to the
>> storage network maybe it's not worth the effort?
>>
>>   Eventually I want to setup LACP on the storage network, but I had to
>> wipe the servers and reinstall from scratch the last time I tried to set
>> that up.  I was thinking that it was because I setup the bonding before
>> installing oVirt, so I didn't do that this time.
>>
>>   Here are my /etc/sysconfig/network-scripts/ifcfg-* files in case I did
>> something wrong there (I'm more familiar with Debian/Ubuntu network setup
>> than CentOS)
>>
>> ifcfg-eth0: (ovirtmgmt aka storage)
>> ----------------
>> BROADCAST=192.168.130.255
>> NETMASK=255.255.255.0
>> BOOTPROTO=static
>> DEVICE=eth0
>> IPADDR=192.168.130.179
>> ONBOOT=yes
>> DOMAIN=public.net
>> ZONE=public
>> IPV6INIT=no
>>
>>
>> ifcfg-eth1: (vmNet aka Internet)
>> ----------------
>> BROADCAST=192.168.1.255
>> NETMASK=255.255.255.0
>> BOOTPROTO=static
>> DEVICE=eth1
>> IPADDR=192.168.1.179
>> GATEWAY=192.168.1.254
>> ONBOOT=yes
>> DNS1=192.168.1.1
>> DNS2=192.168.1.2
>> DOMAIN=public.net
>> ZONE=public
>> IPV6INIT=no
>>
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>

-- 

SANDRO BONAZZOLA

ASSOCIATE MANAGER, SOFTWARE ENGINEERING, EMEA ENG VIRTUALIZATION R&D

Red Hat EMEA <https://www.redhat.com/>
<https://red.ht/sig>
TRIED. TESTED. TRUSTED. <https://redhat.com/trusted>
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