Hi Marcin.
Thank you for the hint. I have now got the l2gateway functionality working as I
hoped for.
To sum up the exact steps taken (I am running the new oVirt v. 4.2.4):
1. In oVirt's web-management interface add the needed "physical network"
network (by which I mean a network created without clicking the "Create on
External Provider" check box). When creating the "physical network" click
"Enable VLAN tagging" and specify the right VLAN ID if this is relevant. In the
following the name of this newly created "physical network" is referred to by
the variable $physnet and the VLAN ID is referred to by the variable $tag.
2. Notice that an extra OVN network named "external_$physnet" is automatically
created by oVirt v. 4.2.4. This _might_ be important and I think that you
_might_ have to create a similar network yourself if using older oVirt
versions. Then you would have to create a similar OVN network manually and
remember to click the "Create on External Provider" check box, click the
"Connect to Data Center Network" and select the "physical network" ($physnet)
you created in step 1.
3. Add the newly created "physical network" ($physnet) to the physical
interface on the physical host which you want to become your future L2 Gateway.
Do this by clicking the host, selecting "Network Interfaces" and clicking the
"Setup Host Networks" button. In the window opened drag-drop the "physical
network" ($physnet) icon onto the box containing the name of the relevant
physical interface of the host.
4. In oVirt create a pure OVN overlay network (by clicking the "Create on
External Provider" check box) which will be used for communication by all VM's
needing access to the physical network - no matter which host they are running
on and no matter if the host has a direct physical interface to the "physical
network" ($physnet) or not. In the following the name of this newly created OVN
overlay network will referred to by the variable $ovn.
5. Enter this command on the oVirt engine server to find the chassis UUID of
the future L2 Gateway host:
# ovn-sbctl show
Which creates output similar to this:
Chassis "16a1d7e4-70f6-4683-8ad6-77fe7fa6d03f"
hostname: "kvm1.ovirt.local"
Encap geneve
ip: "10.100.0.11"
options: {csum="true"}
Chassis "2801ee0b-46c4-4c23-aafc-85804afdff54"
hostname: "kvm2.ovirt.local"
Encap geneve
ip: "10.100.0.12"
options: {csum="true"}
Chassis "e732b833-200c-45bb-b55f-25c0f2ab504e"
hostname: "kvm3.ovirt.local"
Encap geneve
ip: "10.100.0.13"
options: {csum="true"}
Notice the Chassis UUID for the oVirt host which you want to become your L2
Gateway: If you e.g. want kvm3.ovirt.local to become your future L2 Gateway
then the chassis UUID in the above example would be
"e732b833-200c-45bb-b55f-25c0f2ab504e". In the following the correct chassis
UUID will be referred to by the variable $chassisUUID.
6. Enter these commands on the oVirt engine server to create a L2 Gateway with
a name contained in the variable $l2gw (the name is not important but you might
want to select something meaningful like "l2gw_$physnet"):
# ovn-nbctl lsp-add $ovn $l2gw "" $tag
# ovn-nbctl lsp-set-addresses $l2gw unknown
# ovn-nbctl lsp-set-type $l2gw l2gateway
# ovn-nbctl lsp-set-options $l2gw network_name=$physnet
l2gateway-chassis=$chassisUUID
Here you need to be extra careful because the OVN developers have been a little
sloppy while naming different option keys: The network name uses an UNDERSCORE
so it is called "network_name" whereas the L2 Gateway chassis uses a HYPHEN so
it is called "l2gateway-chassis". If you get this wrong you can spend quite
some time debugging - trust me!!!
That's it. oVirt takes care of the rest :-)
Best regards,
Carl
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