To install Ussuri, Packstack documentation[1] assumes Centos 8 or RHEL 8. However, it still wants me to disable NetworkManager. When I do that, the Packstack loses all network configuration when rebooting, since Centos 8 relies on NetworkManager to manage all aspects of networking.

Even after re-enabling NetworkManager and installing the NM OVS plugin, br-ex remains down. Admittedly, I am quite clueless regarding the management of OVS, with or without NetworkManager. Here are some of the things I did (I also followed instructions for connecting Packstack to the existing network[2]):

$ cat /etc/sysconfig/network-scripts/ifcfg-br-exNAME=br-exDEVICE=br-exDEVICETYPE=ovs TYPE=OVSBridgeBOOTPROTO=staticIPADDR=172.24.4.1PREFIX=24ONBOOT=yes$ sudo nmcli d set br-ex managed yes $ sudo ip l set br-ex up $ nmcli dDEVICE TYPE STATE CONNECTIONens3 ethernet connected ens3br-ex openvswitch disconnected --$ sudo nmcli d connect br-exError: Failed to add/activate new connection: Device class NMDeviceOvsInterface had no complete_connection method $ sudo journalctl -u NetworkManager | grep br-ex Jun 07 10:51:45 ...: <info> [1591494705.5163] manager: (br-ex): new Open vSwitch Interface device (/org/freedesktop/NetworkManager/Devices/2) Jun 07 10:51:45 ...: <info> [1591494705.5578] device (br-ex): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external') Jun 07 10:51:45 ...: <info> [1591494705.5598] device (br-ex): carrier: link connected Jun 07 10:51:45 ...: <info> [1591494705.9112] manager: (br-ex): new Open vSwitch Port device (/org/freedesktop/NetworkManager/Devices/6) Jun 07 10:51:45 ...: <info> [1591494705.9686] manager: (br-ex): new Open vSwitch Bridge device (/org/freedesktop/NetworkManager/Devices/11) Jun 07 10:51:46 ...: <info> [1591494706.0306] device (br-ex): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'managed')Any guidance?

[1] https://www.rdoproject.org/install/packstack/
[2] https://www.rdoproject.org/networking/neutron-with-existing-external-network