[ovirt-users] More 4.1 Networking Questions

Mon Apr 10 08:16:04 UTC 2017

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?

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/

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?
> 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
>
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>
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