RHEVH ends up with network interface named breth0, not rhevm

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I've been attempting to get a CLEAN install of rhevm and a rhevh host and have run into a problem that seems to contradict the nice little videos:

* Red Hat Enterprise Virtualization 3.1 - Installing RHEV Manager :: https://access.redhat.com/knowledge/videos/269993 [1]
* Red Hat Enterprise Virtualization 3.1 - Installing RHEV Hypervisor :: https://access.redhat.com/knowledge/videos/270043 [2]
* Red Hat Enterprise Virtualization 3.1 - Connecting to RHEV Manager via Web Admin Portal :: https://access.redhat.com/knowledge/videos/270093 [3]
* Red Hat Enterprise Virtualization 3.1 - Approving RHEV Hypervisors :: https://access.redhat.com/knowledge/videos/270113 [4]

I install rhevh just fine and in exactly the same way as in video 2.

When I get to logging into the rhevm host (video 3),  my host does not appear.  When I add it manually, it seems to work and then sets the node as non-operational.  When I investigate further, I can see that something different -  my rhevh interface is set to breth0, not rhevm,
the management interface.   If I then 'fiddle' with the rhevm gui,  I can then change the interface from breth0 to rhevm. and eventually it will go green..

My questions are:

 

  1. What prevented me from adding this cleanly?  What do I check?  dns works, rhevm and rhevh can resolve each other and ping each other.
  2. What logs do look at ?  engine.log?  ovirt.log?  
  3. How do you CLEANLY recover from this?  I am rather tired of running rhevm-cleanup/setup and reinstalling the host every time this happens

Rick

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