Dan Smith wrote: > DL> Is it possible to enter the namespace and dump / restore the > DL> routes with NETLINK_ROUTE from userspace ? Or is it something not > DL> possible ? > > I'm sure it would be doable. However, checkpointing the routes that > way would: > > (a) Be inconsistent with how we checkpoint all the other resources, > including the other network resources we handle from the kernel > with rtnl > (b) Require merging of the data from the resources saved in userspace > with those saved in kernelspace See below suggestion for userspace. > (c) Eliminate the ability for an application to easily checkpoint > itself by making a single syscall I can't think of a use-case of a networked application that takes a checkpoint of itself (including live network). Anyway, it's can still be useful to at least do the restore from userspace (while checkpoint is done in kernel - like with pids). We may reduce the complexity of restore (in kernel) greatly. (BTW, instead of syscall one could have a library call that will take care of the userspace "work"). > (d) Require this same sort of jumping back and forth between > namespaces by the userspace task doing the checkpoint/restart > I wonder: if we could relatively simply recreate the network ns, the interfaces in them, and then restore the routing information all from userspace before calling sys_restart, it may be useful in simplifying the kernel code, and allowing more flexibility for userspace alterations. I definitely should have asked the question much earlier when you started the work on restoring network ns and interfaces ... (oh, I reckon it's better late than never). Just tossing out the idea, see what kind of thoughts it evokes. Most likely I'll get a "that won't work because ...", but I'm hoping for a "hmm.. maybe.. let me see.." :) Oren. _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
