Re: [patch 3/4] Network namespaces: IPv4 FIB/routing in namespaces

Daniel Lezcano wrote:

Kirill Korotaev wrote:

quoted

quoted

quoted

quoted

quoted

Structures related to IPv4 rounting (FIB and routing cache)
are made per-namespace.

Hi Andrey,

if the ressources are private to the namespace, how do you will 
handle NFS mounted before creating the network namespace ? Do you 
take care of that or simply assume you can't access NFS anymore ?

This is a question that brings up another level of interaction between
networking and the rest of kernel code.
Solution that I use now makes the NFS communication part always run in
the root namespace.  This is discussable, of course, but it's a far more
complicated matter than just device lists or routing :)

if we had containers (not namespaces) then it would be also possible 
to run NFS in context of the appropriate container and thus each user 
could  mount NFS itself with correct networking context.

With a relatively small patch, I was able to make NFS bind to a particular
local IP (poor man's namespace with existing code).  I also changed it so
that multiple mounts to the same destination (and with unique local mount
points) are treated as unique mounts.  This patch was done so that I could
stress test NFS servers, but similar logic might work for namespace isolation
as well...

Ben

-- 
Ben Greear [off-list ref]
Candela Technologies Inc  http://www.candelatech.com