Hi nova-devs,

I raised a bug about nova-api-metadata messing with iptables on a host 

https://bugs.launchpad.net/nova/+bug/1648643 
<https://bugs.launchpad.net/nova/+bug/1648643>

It got closed as won’t fix but I think it could do with a little more 
discussion.

Currently nova-api-metadata will create an iptable rule and also delete other 
rules on the host. This was needed for back in the nova-network days as there 
was some trickery going on there.
Now with neutron and neutron-metadata-proxy nova-api-metadata is little more 
that a web server much like nova-api.

I may be missing some use case but I don’t think nova-api-metadata needs to 
care about firewall rules (much like nova-api doesn’t care about firewall rules)

Thanks,
Sam

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