I check the status of ovirt-provider-ovn. It's inactive. [root@ovirt-manager ~]# systemctl status ovirt-provider-ovn ● ovirt-provider-ovn.service - oVirt OVN provider Loaded: loaded (/usr/lib/systemd/system/ovirt-provider-ovn.service; disabled; vendor preset: disabled) Active: inactive (dead) Then I start ovirt-provider-ovn service. [root@ovirt-manager ~]# systemctl start ovirt-provider-ovn [root@ovirt-manager ~]# systemctl status ovirt-provider-ovn ● ovirt-provider-ovn.service - oVirt OVN provider Loaded: loaded (/usr/lib/systemd/system/ovirt-provider-ovn.service; disabled; vendor preset: disabled) Active: active (running) since Thu 2019-11-07 09:29:00 CST; 2s ago Main PID: 10512 (python2) CGroup: /system.slice/ovirt-provider-ovn.service └─10512 /usr/bin/python2 /usr/share/ovirt-provider-ovn/ovirt_provi...