Red Hat Bugzilla – Bug 1556852
ping to floating IPs of VMs start working only after pinging from within VM to the outside first
Last modified: 2018-10-18 03:25:25 EDT
Description of problem: Pinging floating IP of a VM on overcloud from an external machine doesn't work straight away. It starts working only after pinging from within VM to the outside/external world first. Version-Release number of selected component (if applicable): opendaylight-8.0.0-2.el7ost.noarch puddle 2018-02-14.1 leveldbjni-all-1.8-15.7.el7ost.x86_64.rpm puppet-opendaylight-7.0.0-0.20180215165947.d3b32a4.el7ost.noarch.rpm How reproducible: always Steps to Reproduce: 1. deploy overcloud with odl 2. create a VM, assign a floating IP to it 3. test ping from a machine on external network (i.e.: 10.0.0.50 - undercloud) to this VM's floating IP (i.e.: 10.0.0.211) doesn't work. After logging in to the VM and pinging 10.0.0.50 (note first few packets with no reply): [redhat@waldek1 ~]$ ping 10.0.0.50 PING 10.0.0.50 (10.0.0.50) 56(84) bytes of data. 64 bytes from 10.0.0.50: icmp_seq=4 ttl=64 time=1.28 ms 64 bytes from 10.0.0.50: icmp_seq=5 ttl=64 time=1.04 ms 64 bytes from 10.0.0.50: icmp_seq=6 ttl=64 time=0.598 ms 64 bytes from 10.0.0.50: icmp_seq=7 ttl=64 time=0.581 ms the originally failing ping undercloud-0 -> VM starts to work as well. Actual results: ping to VM's floating IP fail Expected results: ping to work Additional info:
When the ping happens from undercloud to the vm the controller is not able to learn the external PNF and insert a flow in table21 . The below exception is seen in the logs 2018-03-15 17:40:01,682 | WARN | entLoopGroup-9-4 | MatchExtensionHelper | 370 - org.opendaylight.openflowplugin - 0.7.0.SNAPSHOT | Convertor for MatchEntry [_matchEntryValue=NshNpCaseValue [_nshNpValues=NshNpValues [_value=192, augmentation=[]], augmentation=[]], _oxmClass=class org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.Nxm1Class, _oxmMatchField=class org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.match.rev140421.NxmNxNshNp, _hasMask=false, augmentation=[]] for version 4 with match path PACKET_IN_MESSAGE_MATCH not found. 2018-03-15 17:40:01,682 | WARN | entLoopGroup-9-4 | OFDecoder | 392 - org.opendaylight.openflowplugin.openflowjava.openflow-protocol-impl - 0.7.0.SNAPSHOT | Message deserialization failed java.lang.NullPointerException: null But when vm ping the undercloud the learning happens , table 21 flow is programmed and traffic is successful. This table 21 flow is used when undercloud to vm ping is tried later, and hence it is successful.
Verified with: opendaylight-8.0.0-5.el7ost.noarch
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2018:2086