here is the comment from juju team John Meinel:

There is nothing to say that the PXE address is better than the other address 
for any given *user's* deployment. If a charm isn't updated to support 
network-get, even if we did make private-address stable, there would be no way 
to put the application on the second interface when you really wanted it. And 
if a charm is updated to support network-get, then the stability of 
private-address is not as important.
FWIW, I believe we actually default private-address to the first address that 
MAAS returns. I haven't found any particular ordering to their value, as while 
it seems to be stable per node, it is not stable between nodes. (If I configure 
2 nodes with similar network devices, named the same, in similar address 
ranges, one Node has a 172.* address first, and the second node has a 10.* 
address first, etc.)

I'm not against making private-address more stable, but I do feel like
it is completely papering over the real issue, which is being able to
allow a user to specify where they want the application deployed by
making the charm ask Juju where it has been configured to run.

John

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https://bugs.launchpad.net/bugs/1657305

Title:
  percona cluster getting wrong private ip

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