[ovs-discuss] Seeking help on bringing up ovs defined network at boot under Ubuntu bionic

[Stephen V. Nesbitt]

Noob alert! I am looking for a recipe that will configure an OVS defined 
network at boot on Ubuntu bionic.

My ovs network comprises the following:

* switch0

* enp3s0 - physical NIC defined as a port tagged with 100 and marked as 
vlan_mode=native-untagged

* vnet100 - port tagged with 100 and set with an internal interface

* vlan100 - a fake bridge (add-br vlan100 switch0 100) which gets the ip 
address

As far as I can tell this is working - my host system is attached to the 
192.168.0.1/26 and I can give containers access to this network using 
vlan100.

What I don't know how to do is setup an Ubuntu bionic system to bring 
this network up at boot. I've looked at the following options:

* Netplan - doesn't look like it will support this.

* Systemd-networkd - maybe, but it is unclear how.

* switch to ifupdown and define an interfaces file using allow-ovs stanzas.

I've spent most of my time looking at ifupdown. But simply can't get it 
to work. Specifically my interfaces file is apparently ignored. I 
*think* this is caused because ifup needs to be called with the 
--allow=ovs option. But I have no idea how to enable this.

Other questions include whether I need to add an 
openvswitch-nonetwork.system file to ensure the openvswitch is enabled 
prior to bringing up the network and whether the auto clause is needed 
(and where) with the interface definition.

If someone could provide - or point me to - a recipe I'd be very 
appreciative.

Thx in advance,


-steve