Hello,

I have an Openstack Queens environment that is composed by VMs inside oVirt.

Initially this oVirt environment was on 4.3 and on director I had to set vdsm mac spoof to be able to give dhcp address to the overcloud nodes.

I tried something at that time with vnic profiles but I was not able to have it work as expected, so I used the hook.

Now I have migrated this same environment to 4.4.2 and I see that vdsm mac spoof is no more an option:

I tried some combinations of vnic profiles on director vnic but it seems not to work as a dhcpserver as before.

I see DHCPDISCOVER from overcloud node in director messages (while before I saw DHCPREQUEST), I see the DHCPOFFER from director, but I don't see the DHCPACK from the overcloud node...

On director I have the br-ctlplane vswitch using its interface eth1:

ovs-vsctl show

. . .

    Bridge br-ctlplane
        Controller "tcp:127.0.0.1:6633"
            is_connected: true
        fail_mode: secure
        Port br-ctlplane
            Interface br-ctlplane
                type: internal
        Port "eth1"
            Interface "eth1"
        Port phy-br-ctlplane
            Interface phy-br-ctlplane
                type: patch
                options: {peer=int-br-ctlplane}
    ovs_version: "2.11.0"

 [root@director ~]# ovs-ofctl show br-ctlplane
OFPT_FEATURES_REPLY (xid=0x2): dpid:0000566f3d480014
n_tables:254, n_buffers:0
capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst
 1(eth1): addr:56:6f:3d:48:00:13
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(phy-br-ctlplane): addr:76:76:8b:08:d4:2f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ctlplane): addr:56:6f:3d:48:00:14
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
 [root@director ~]#

 [root@director ~]# ip addr show dev br-ctlplane
6: br-ctlplane: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
    link/ether 56:6f:3d:48:00:14 brd ff:ff:ff:ff:ff:ff
    inet 172.23.0.220/24 brd 172.23.0.255 scope global br-ctlplane
       valid_lft forever preferred_lft forever
    inet 172.23.0.222/32 scope global br-ctlplane
       valid_lft forever preferred_lft forever
    inet 172.23.0.221/32 scope global br-ctlplane
       valid_lft forever preferred_lft forever
    inet6 fe80::546f:3dff:fe48:14/64 scope link
       valid_lft forever preferred_lft forever
 [root@director ~]#

The eth1 interface is configured in oVirt on vlan23.

The overcloud nodes have one vnic on vlan 23.

I have two dnsmasq processes on director, for ironic and for overcloud nodes:

nobody    1527     1  0 Nov14 ?        00:00:00 /sbin/dnsmasq --conf-file=/etc/ironic-inspector/dnsmasq.conf
nobody    3288     1  0 Nov14 ?        00:00:00 dnsmasq --no-hosts --no-resolv --pid-file=/var/lib/neutron/dhcp/22a5739b-acb6-4400-8247-080a66895f1a/pid --dhcp-hostsfile=/var/lib/neutron/dhcp/22a5739b-acb6-4400-8247-080a66895f1a/host --addn-hosts=/var/lib/neutron/dhcp/22a5739b-acb6-4400-8247-080a66895f1a/addn_hosts --dhcp-optsfile=/var/lib/neutron/dhcp/22a5739b-acb6-4400-8247-080a66895f1a/opts --dhcp-leasefile=/var/lib/neutron/dhcp/22a5739b-acb6-4400-8247-080a66895f1a/leases --dhcp-match=set:ipxe,175 --local-service --bind-dynamic --dhcp-range=set:subnet-d48e002b-f269-4ed5-a96e-9aeba0b119b9,172.23.0.0,static,255.255.255.0,86400s --dhcp-option-force=option:mtu,1500 --dhcp-lease-max=256 --conf-file=/etc/dnsmasq-ironic.conf --domain=localdomain

In messages of director when booting the overcloud node:

Nov 15 00:42:45 director dnsmasq-dhcp[3288]: DHCPDISCOVER(tap9fdd5920-62) 172.23.0.232 56:6f:3d:48:00:3c
Nov 15 00:42:45 director dnsmasq-dhcp[1527]: 3792136019 DHCPDISCOVER(br-ctlplane) 56:6f:3d:48:00:3c ignored
Nov 15 00:42:45 director dnsmasq-dhcp[3288]: DHCPOFFER(tap9fdd5920-62) 172.23.0.232 56:6f:3d:48:00:3c

Nov 15 00:42:45 director dnsmasq-dhcp[3288]: DHCPOFFER(tap9fdd5920-62) 172.23.0.232 56:6f:3d:48:00:3c

In oVirt 4.3 with the same setup and VDSM MAC spoof hook configured I saw this inside messages of director when booting the overcloud nodes:

Oct 18 04:50:05 director dnsmasq-dhcp[3230]: DHCPREQUEST(tap9fdd5920-62) 172.23.0.232 56:6f:3d:48:00:3c
Oct 18 04:50:05 director dnsmasq-dhcp[3230]: DHCPACK(tap9fdd5920-62) 172.23.0.232 56:6f:3d:48:00:3c host-172-23-0-232

Questions:

what is the filter to give to have it work?

is it dynamic the effect at runtime for a running VM to edit its vnic and change its profile?

is it dynamic for running VMs that for a vNIC with a certain profile if I go in Networks --> vNIC Profiles --> Edit vNIC Profile and change its network filter value?

Thanks for any insight.

Gianluca