Mesh testing on a cluster

[Brian DeLacey]

We made progress today getting a test mesh configuration established on a
cluster. So far, we've only done a few basic tests, pinging nodes on the
cluster, across the mesh but things are working well.

We have a rack of clustered PCs and we've been able to ping those, via
multiple hops, from laptops outside the cluster. The tricky part was how to
test these remotely. We had to figure out a way to get around the usual
first step, which is typically to "killall NetworkManager" so that we could
continue to test via ssh remote logins. Thank you, Andrey, for providing the
suggestion on how to handle this:

Problem > Is there any way (or hope) to run mesh tests without shutting down
NM? The cluster of computers we have access to has ongoing uptime demand.

Solution > Tell NetworkManager to ignore the mesh interface, and the
mesh-capable WiFi interface in general.  It's ok to have NM running as long
as it leaves our mesh interface alone, otherwise it brings it up/down, tries
to scan, etc.

Now we move on to more advanced testing ...

Brian
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