[ovirt-users] Communicate between the guest vm's hosted on, different hosts on different data centres using OVS

[Charles Tassell]

Hmm, so you have 2 10G ports on each host.  1 port is currently in use 
with oVirt, and the other isn't?  Then I think you just add a new 
network in the Networks tab called OVNLink, then go into the Hosts tab, 
click on each host and then on the Network Interfaces tab in the bottom 
of the window and assign the unused 10G network device to that link.

I haven't used OVN with oVirt, but that would work with regular 
networking so I think it should work with OVN.

If the link is already in use, you should be able to do the same thing 
only when you add the new network set it up with a VLAN ID. If you are 
going through a switch then the switch will have to be setup to handle 
the VLANs.


On 2017-04-20 10:07 PM, Linov Suresh wrote:
> Hi Charles,
>
> We use an Ethernet cable to connect between the hosts through 10G port.
>
> We want to use the guest VM's hosted on different hosts 10G network. 
> oVirt already supports SR-IOV. So we should guest 10G speed for our VM's.
>
> In KVM we can create a second bridge and add the 10G interface to the 
> bridge would do the trick.
>
> But in oVirt how do we do this? We want to use our OVs network, which 
> was created using OVN Provider.
>
>     Linov Suresh
>
>
> On Thu, Apr 20, 2017 at 6:59 PM, Charles Tassell <ctassell at gmail.com 
> <mailto:ctassell at gmail.com>> wrote:
>
>     Hi Suresh,
>
>       You would need to connect the two OVN instances somehow.  If
>     it's just two single hosts, I think the easiest way would be to
>     create a VPN connection between the two hosts with OpenVPN or the
>     like and then add the tun/tap interfaces into the OVN on each
>     box.  You might run into problems if you start adding more hosts
>     though, as if the host with the VPN goes down it would disconnect
>     the two datacenters.
>
>       If the two datacenters are on the same physical network (ie, you
>     just mean oVirt datacenter and not different colocation providers)
>     then adding a VLAN to the NICs connected to the OVN interface
>     would work.  You would probably have to setup some sort of channel
>     bonding/LACP as you add more hosts, but OVN should be able to
>     handle that simply enough.
>
>     On 2017-04-20 07:33 PM, users-request at ovirt.org
>     <mailto:users-request at ovirt.org> wrote:
>
>         Date: Thu, 20 Apr 2017 14:43:26 -0400
>         From: Linov Suresh <linov.suresh at gmail.com
>         <mailto:linov.suresh at gmail.com>>
>         To: users at ovirt.org <mailto:users at ovirt.org>
>         Subject: [ovirt-users] Communicate between the guest vm's
>         hosted on
>                 different hosts on different data centres using OVS
>         Message-ID:
>                
>         <CALdvvBP6MwbKa-P=q-UeZHMayZ3YPRpjersL0u=2srG=pcCnkQ at mail.gmail.com
>         <mailto:pcCnkQ at mail.gmail.com>>
>         Content-Type: text/plain; charset="utf-8"
>
>         Hello,
>
>         I have configured OVS network on oVirt 4.1.1, following the
>         document
>         https://www.ovirt.org/blog/2016/11/ovirt-provider-ovn/
>         <https://www.ovirt.org/blog/2016/11/ovirt-provider-ovn/>
>
>         I have created OVN Provider, and created new Logical Network
>         for OVS using
>         OVN Provider. I have synced the network also selected OVS when
>         I created
>         the cluster.
>
>         I have two data centres and each data centre has one host each.
>
>         Now I have created VM's selecting OVS network (not ovirtmgmt).
>         VM's in the
>         same data centre can talk to each other.
>
>         How do i make the VM's hosted on different data centre can
>         talk to each
>         other?
>
>         Appreciate your help in advance,
>
>         Sincerely,
>
>         Suresh.
>
>
>

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