wrote:

Hello, I'm successfully testing and using OVN on a single host environment with self hosted engine and 4.1 I'm using ip of ovirtmgmt for the host local ip used for OVN tunneling, even if actually with a single host it is not so important... ovirtmgmt bridge is on top ot lacp based bonding Now I would like to apply it on another environment composed by 3 hosts. Here ovirtmgmt bridge is on top of an active-backup bonding. Are there any cons to put the local ip used for tunneling on ovirtmgmt ip? Any problems/impacts on engine access/functionality using this ip for the tunnel? Is in genera OVN considered stable/fully usable in 4.1? Thanks in advance, Gianluca _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users

Cannot edit Interface. External network cannot be changed while the

With missing authentication do you mean that I could set up a non-oVirt

In the sense that the tunnel basically already realizes the isolation from

interfering in case I have a great exchange of data for example over the

BTW: does it make sense to create another vlan on the bonding (that is

The same question could also apply to a general case where for example my

On Wed, Feb 15, 2017 at 1:55 PM, Marcin Mirecki <mmirecki(a)redhat.com&gt; wrote: > Hello Gianluca, > > OVN is a tech preview feature in 4.1 > It's 'fully usable' as far as the basic networking functionality goes > (network, ports, subnets), > OK, my question was mainly related to negative interference with other parts of oVirt. I plan to use it side by side with normal networking so that in the same Cluster/Datacenter I can have VMs with "legacy" networks, VMs with OVN provided networks and eventually VMs with a mix of the two. BTW: I see that while I can hot add an OVN nic to a VM, I cannot hot edit an OVN nic; I get the error: Cannot edit Interface. External network cannot be changed while the virtual machine is running. Any plan to solve this? > but it's still missing some parts like authentication, automatic host > installation, some of the rest support and others. > Not a big problem for my tests. With missing authentication do you mean that I could set up a non-oVirt host installing controller and driver parts an let it join the others without control? Or keystone/similar integration? > You can use ovirtmgmt for the OVN tunnels. How ovirtmgmt is configured is > also not relevant for OVN. > I am using a similar setup (without bonds) on my dev environment and it's > working fine. > So I could have ovirtmgmt on a vlan based bonding and use it without problems? In the sense that the tunnel basically already realizes the isolation from the ovirtmgmt network itself (what usually we do making vlans) without interfering in case I have a great exchange of data for example over the tunnel between 2 VMs placed on different hosts? BTW: does it make sense to create another vlan on the bonding (that is already setup with vlans), assigning an ip on the hosts and then use it? Probably the answer above applies to this too... In this case is it recommended to do it from inside oVirt itself or one can do it manually in the OS (supposing plain CentOS configuration for hypervisors)? The same question could also apply to a general case where for example my hosts have to integrate into a dedicated lan in the infrastructure (eg for backup or monitoring or what else)... would I configure this lan from oVirt or better from hosts themselves? Thanks in advance for your time Gianluca

On Wed, Feb 15, 2017 at 4:23 PM, Marcin Mirecki <mmirecki(a)redhat.com&gt; wrote: > It should not have any negative interference on configuration issues, > but > it could have a negative impact on performace of your ovirtmgmt network, > in case your OVN traffic saturates the connection. > > >Cannot edit Interface. External network cannot be changed while the > virtual machine is running. > The error message is incorrect (it predates the introduction of nic > hotplugging) > It is enough to unplug/plug the nic before/after doing changes (the nic > must be in the unplugged state to change it). > As far as I know there is already a bug reported about the error message > being incorrect. > OK. I just verified that it works as you described, thanks > >In the sense that the tunnel basically already realizes the isolation > from the ovirtmgmt network itself (what usually we do making vlans) without > >interfering in case I have a great exchange of data for example over the > tunnel between 2 VMs placed on different hosts? > If the traffic going over the tunnel saturates that link, it will > interfere with with your ovirtmgm traffic. For testing this setup should be > ok, I would not recommend it for production. > OK, but at least the packets would be invisible to the ovirtmgmt network I mean, typically on the same adapter you put separate vlans to segregate traffic. This doesn't give you the double of the bandwidth but the isolation of the network so that it doesn't to go and inspect the packet to see what is the target and so on... Does this make sense in this way for the tunnel too or nothing at all? > > > >BTW: does it make sense to create another vlan on the bonding (that is > already setup with vlans), assigning an ip on the hosts and then use it? > The tunnel should take care of the isolation, so I don't think it would > add any value. > > >The same question could also apply to a general case where for example > my hosts have to integrate into a dedicated lan in the infrastructure (eg > for backup or monitoring or what else)... would I configure this lan from > oVirt or better from hosts themselves? > Any configuration changes made manually would cause ovirt to see them as > unsynchronized. To do it cleanly you would have to hide the nics used for > this by adding them to 'hidden_nic' in vdsm configuration (nics ignored by > ovirt). Let me know if you want more information on this. > If you need a network to be used by the host, a better solution would be > to just create a separate network from ovirt (a non-vm network if you don't > need a bridge on top of the nic). > Ah, I see. I think the relevant lines in vdsm.conf are: # Comma-separated list of fnmatch-patterns for host nics to be hidden # from vdsm. # hidden_nics = w*,usb* # Comma-separated list of fnmatch-patterns for host bonds to be hidden # from vdsm. # hidden_bonds = # Comma-separated list of fnmatch-patterns for host vlans to be hidden # from vdsm. vlan names must be in the format "dev.VLANID" (e.g. # eth0.100, em1.20, eth2.200). vlans with alternative names must be # hidden from vdsm (e.g. eth0.10-fcoe, em1.myvlan100, vlan200) # hidden_vlans = And in case I have to create some file of type 01_hidden.conf in /etc/vdsm/vdsm.conf.d/ to preserve across upgrades, correct? Gianluca

OVN is aleady using GENEVE, VXLAN or STT tunnels (the user can choose any), so the isolation is already assured. The scripts provided by ovirt configure a geneve tunnel. You are free so override this manually to vxlan or stt if you want, let me know if you need any howto info.