Folks,

I have had discussions with some folks individually about this but I would
like bring this to a broader audience.

I have been playing with security groups and I see the notion of 'default'
security group seems to create some nuisance/issues.

There are list of things I have noticed so far:

   - Tenant for OpenStack services (normally named service/services) also
   ends up having default security group.
   - Port create operation ends up ensuring default security groups for all
   the tenants as this completely seems out of the context of the tenant the
   port operation takes place. (bug?)
   - Race conditions where if system is stressed and Neutron tries to
   ensure the first default security group and in parallel another call comes,
   Neutron ends up trying to create multiple default security groups as the
   checks for duplicate groups are invalidated as soon as the call make past a
   certain point in code.
   - API performance where orchestration chooses to spawn 1000 tenants and
   we see unnecessary overhead.
   - For plugins that use RESTful proxy backends require the backend
   systems to be up at the time neutron starts. [Minor, but affects some
   packaging solutions]


To summarize, is there a way to disable default security groups? Expected
answer is no; can we introduce a way to disable it? If that does not make
sense, should we go ahead and fix the issues around it?

I am sure some of you must have seen some of these issues and solved them
already. Please do share how do tackle these issues?

Thanks,
Fawad Khaliq
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