[CRIU] criu + threaded program + TCP_REPAIR

[Ruslan Kuprieiev]

Hi Sowmini!

Thank you for your feedback!
I will try to answer some of your questions.

On 19.10.2014 00:47, Sowmini Varadhan wrote:
> On (10/14/14 14:29), Pavel Emelyanov wrote:
>> Ah, live migration :) You may be interested in the
>> https://github.com/xemul/p.haul
> A few questions.. So I tried starting from
>    https://github.com/xemul/p.haul/wiki/Live-migrating-OVZ-mainstream-container
> Some hiccups I ran into..
> 1. in my ubuntu vm, env was in /usr/bin/env by default, I had to fix up
>     p.haul-service manually to detect this. (minor errata in p.haul-service?)

Yes, sorry for that. Just sent the patch to fix it. Hope it will be 
committed
ASAP.

> 2. the HOWTO page does not mention that you need the python-protobuf.socketrpc
>     package (and s/protobuf-python/python-protobuf)- might be good to call this
>     out, and I did the apt install of these, but...
> 3. Various errors like
>      " File "/home/sowmini/src/p.haul/p_haul_service.py", line 6, in <module>
>         import rpc_pb2 as cr_rpc"
>     In each case I had to specify the src package
>      from protobuf.socketrpc import rpc_pb2 as cr_rpc
>     Is there something wrong in my env that I need this?
> 4. where (what apt package/src) to get stats_pb2.py? It wasnt there in
>     python-protobuf[.socketrpc]

You don't need python-protobuf.socketrpc. rpc_pb2.py and stats_pb2.py
are to be generated by running "make" in p.haul root directory.
Just sent the patch to explain how to get p.haul ready.

> And if I used lxc tools to create the container, but what is the $id
> that is expected by p.haul?
>
> In any case, I also tried to just spawn my process from something like
> ns_child_exec.c [http://lwn.net/Articles/533492/].
>
> So if I do this:
>
>    # ns_child_exec -v -p bash
>    pidns# iperf -s &
>
> Now, do I criu-dump/restore using the pid of ns_child_exec? Or the
> pid(bash)?  Or the pid(iperf)?  (from default pidns? from the child
> pidns?)
>
> If I try to dump using pid(ns_child_exec) I get
>
> root at vm# criu dump -D . -t <pid-of-ns_child_exec> --shell-job --tcp-established
> Error (namespaces.c:196): Can't dump nested pid namespace for 15022
> Error (namespaces.c:392): Can't make pidns id
>
> so still trying to find the path-of-least-resistance here..
>
> --Sowmini
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