<div dir="ltr"><div><div>I'm using devsatck on one controller node and one compute node. the instance created in controller node can get IP address by DHCP without problem but those in compute node always fail to get IP address. I tried to trace the DHCP request and found it was not forwarded out of the compute node. I think the problem could be the ovs settings but I don't know how to solve it. here is what did to trace the problem<br>
<br>1. ovs-vsctl show<br><div style="margin-left:40px">    Manager "tcp:<a href="http://172.22.11.43:6640">172.22.11.43:6640</a>"<br>        is_connected: true<br>    Bridge br-int<br>        Controller "tcp:<a href="http://172.22.11.43:6633">172.22.11.43:6633</a>"<br>
            is_connected: true<br>        fail_mode: secure<br>        Port "tap766671cd-d8"<br>            tag: 1<br>            Interface "tap766671cd-d8"<br>        Port br-int<br>            Interface br-int<br>
                type: internal<br>        Port patch-tun<br>            Interface patch-tun<br>                type: patch<br>                options: {peer=patch-int}<br>        Port "vxlan-172.31.0.125"<br>            Interface "vxlan-172.31.0.125"<br>
                type: vxlan<br>                options: {key=flow, local_ip="172.22.11.43", remote_ip="172.31.0.125"}<br>    Bridge br-tun<br>        Port patch-int<br>            Interface patch-int<br>
                type: patch<br>                options: {peer=patch-tun}<br>        Port "vxlan-ac1f007d"<br>            Interface "vxlan-ac1f007d"<br>                type: vxlan<br>                options: {in_key=flow, local_ip="172.22.11.43", out_key=flow, remote_ip="172.31.0.125"}<br>
        Port br-tun<br>            Interface br-tun<br>                type: internal<br>    ovs_version: "2.1.90"<br><br></div>2. capture packets of DHCP request in all ports of the two bridges. I found the packet went through tap766671cd-d8 and <br>
vxlan-172.31.0.125 in br-int but not patch-tun. according to <a href="http://docs.openstack.org/trunk/openstack-ops/content/network_troubleshooting.html">http://docs.openstack.org/trunk/openstack-ops/content/network_troubleshooting.html</a>. it should go to patch-tun and then patch-int in br-tun. obviously it does not.<br>
</div>3. I tried to dump the flows of ovs and it seems the packet won't go through br-tun with the flow setting. is this the root cause? if so, how do I modify the flow setting by changing local.conf for stack.sh?<br>
<div style="margin-left:40px">$ ovs-ofctl dump-flows br-int -O OpenFlow13<br>OFPST_FLOW reply (OF1.3) (xid=0x2):<br> cookie=0x0, duration=2294.917s, table=0, n_packets=9, n_bytes=1434, send_flow_rem in_port=2,dl_src=fa:16:3e:d6:ee:31 actions=set_field:0x3e9->tun_id,goto_table:10<br>
 cookie=0x0, duration=2285.698s, table=0, n_packets=0, n_bytes=0, send_flow_rem priority=8192,in_port=2 actions=drop<br> cookie=0x0, duration=2264.881s, table=0, n_packets=0, n_bytes=0, send_flow_rem tun_id=0x3e9,in_port=3 actions=goto_table:20<br>
 cookie=0x0, duration=3133.421s, table=0, n_packets=0, n_bytes=0, send_flow_rem dl_type=0x88cc actions=CONTROLLER:56<br> cookie=0x0, duration=2272.421s, table=10, n_packets=5, n_bytes=650, send_flow_rem priority=8192,tun_id=0x3e9 actions=goto_table:20<br>
 cookie=0x0, duration=2262.715s, table=10, n_packets=4, n_bytes=784, send_flow_rem priority=16384,tun_id=0x3e9,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:3,goto_table:20<br> cookie=0x0, duration=2267.424s, table=20, n_packets=0, n_bytes=0, send_flow_rem priority=8192,tun_id=0x3e9 actions=drop<br>
 cookie=0x0, duration=2281.314s, table=20, n_packets=0, n_bytes=0, send_flow_rem tun_id=0x3e9,dl_dst=fa:16:3e:d6:ee:31 actions=output:2<br> cookie=0x0, duration=2275.604s, table=20, n_packets=9, n_bytes=1434, send_flow_rem priority=16384,tun_id=0x3e9,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:2<br>
<br># ovs-ofctl dump-flows br-tun<br>NXST_FLOW reply (xid=0x4):<br> cookie=0x0, duration=3178.843s, table=0, n_packets=0, n_bytes=0, idle_age=3178, priority=0 actions=drop<br> cookie=0x0, duration=3179.361s, table=0, n_packets=631, n_bytes=57421, idle_age=1, priority=1,in_port=1 actions=resubmit(,1)<br>
 cookie=0x0, duration=3172.443s, table=0, n_packets=1270, n_bytes=92075, idle_age=1, priority=1,in_port=2 actions=resubmit(,3)<br> cookie=0x0, duration=3178.327s, table=1, n_packets=0, n_bytes=0, idle_age=3178, priority=1,dl_dst=00:00:00:00:00:00/01:00:00:00:00:00 actions=resubmit(,20)<br>
 cookie=0x0, duration=3177.807s, table=1, n_packets=631, n_bytes=57421, idle_age=1, priority=1,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=resubmit(,21)<br> cookie=0x0, duration=3177.288s, table=2, n_packets=0, n_bytes=0, idle_age=3177, priority=0 actions=drop<br>
 cookie=0x0, duration=3176.746s, table=3, n_packets=1270, n_bytes=92075, idle_age=1, priority=0 actions=drop<br> cookie=0x0, duration=2343.819s, table=3, n_packets=0, n_bytes=0, idle_age=2343, priority=1,tun_id=0x3e9 actions=mod_vlan_vid:1,resubmit(,10)<br>
 cookie=0x0, duration=3176.235s, table=10, n_packets=0, n_bytes=0, idle_age=3176, priority=1 actions=learn(table=20,hard_timeout=300,priority=1,NXM_OF_VLAN_TCI[0..11],NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[],load:0->NXM_OF_VLAN_TCI[],load:NXM_NX_TUN_ID[]->NXM_NX_TUN_ID[],output:NXM_OF_IN_PORT[]),output:1<br>
 cookie=0x0, duration=3175.720s, table=20, n_packets=0, n_bytes=0, idle_age=3175, priority=0 actions=resubmit(,21)<br> cookie=0x0, duration=3175.199s, table=21, n_packets=631, n_bytes=57421, idle_age=1, priority=0 actions=drop<br>
 cookie=0x0, duration=2345.304s, table=21, n_packets=0, n_bytes=0, idle_age=2345, dl_vlan=1 actions=strip_vlan,set_tunnel:0x3e9,output:2<br><br></div>4. here is the local.conf I used for compute node<br><div style="margin-left:40px">
ENABLED_SERVICES=n-cpu,rabbit,neutron,q-agt,n-novnc<br>SERVICE_HOST=172.31.0.125<br>MYSQL_HOST=$SERVICE_HOST<br>RABBIT_HOST=$SERVICE_HOST<br>Q_HOST=$SERVICE_HOST<br>Q_PLUGIN=ml2<br>Q_ML2_TENANT_NETWORK_TYPE=vxlan<br>enable_service odl-compute<br>
ODL_MGR_IP=172.22.11.43<br>VNCSERVER_PROXYCLIENT_ADDRESS=172.22.11.43<br>VNCSERVER_LISTEN=0.0.0.0<br></div><br></div>please let me know if there's any info I need provide, thanks.<br><div><div><div style="margin-left:40px">
<br></div></div></div></div>