Re: [RFC PATCH net-next v2 0/5] netns: allow to identify peer netns

From: David Ahern
Date: Fri Sep 26 2014 - 15:44:59 EST

On 9/26/14, 1:34 PM, Eric W. Biederman wrote:
When I wrote the "ip netns" support I never expected that all
applications would want to run in a specific network namespace. All
that is needed is one socket per network namespace.

Sure that is another option. But for a process to create a socket or thread in a second namespace it has to run as root -- CAP_SYS_ADMIN is needed for setns (or perhaps there is another way to create the socket or thread in the namespace).

Second, it still does not address the scalability problem. For example a single daemon providing service across 2k namespaces means it needs 2k listen sockets. From there a system could have 20, 30 or 50 services running. Certainly lighter than a process per namespace, but not even close to ideal when talking about something like VRFs.

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