[chef] Chef 11 not loading very large nodes

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I'm upgrading my production Chef Server from Chef 10 to 11 and ran into a
problem importing some nodes. A node with a 1.5M json file will load, but one
with a 1.9M or larger will not. I get the error

ERROR: . failed to create_child: Failure creating 'server1.json': 413 "Request
Entity Too Large"

These nodes have a very large number of virtual IP addresses discovered by 
ohai
that is making them so large.

I tried playing with client_max_body_size in nginx, but it didn't seem to 
help.
Any other thoughts on what to increase to allow for very large nodes?

Thanks,
Dan