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  1. OpenShift Bugs
  2. OCPBUGS-4037

Connectivity to PODs on a particular node broken

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: Critical Critical
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    • 4.9.z
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      Description of problem:

      PODs on other worker nodes can not connect to PODs on a particular node. Node to node connectivity works fine though. I have also checked OpenFlows from problematic node and I can see correct OpenFlows for all scenarios[POD to POD(same and different node), tun0 to POD on same node].
      State of vxlan_sys_4789 interface on problematic node shows DOWN. In ovs-vswitchd log I can see couple of concerning warning messages.
      ~~~
      ovs|113756|vconn|WARN|unix#347363: version negotiation failed (we support version 0x04, peer supports version 0x01)
      ovs|113757|rconn|WARN|br0<->unix#347363: connection dropped (Protocol error)
      ~~~
      ~~~
      [arghosh@supportshell-1 openvswitch]$ cat ovs-vsctl_-t_5_list_bridge_br0
      name                : br0
      protocols           : [OpenFlow13]
      ~~~
      From dmesg log I can see that veth interfaces are flapping.
      ~~~
      [arghosh@supportshell-1]$ cat ./sos_commands/kernel/dmesg |grep veth|grep 'not ready'|wc -l
      166
      ~~~
      

      Version-Release number of selected component (if applicable):

      4.9.43
      

      How reproducible:

      No Sure
      

      Steps to Reproduce:

      1.
      2.
      3.
      

      Actual results:

      PODs on other worker nodes can not connect to PODs on a particular node. Node to node connectivity works fine though. 
      

      Expected results:

      POD to POD connectivity should work fine
      

      Additional info:

      Checked ofproto/trace command output for different scenarios and could see correct OpenFlows.
      Restarting the problematic node fixes the issue.
      

            mmahmoud@redhat.com Mohamed Mahmoud
            rhn-support-arghosh Arnab Ghosh
            Zhanqi Zhao Zhanqi Zhao
            Patryk Diak, Zenghui Shi
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              Created:
              Updated:
              Resolved: