[CRIU] criu and runc

[Andrei Vagin]

On Tue, Dec 06, 2016 at 04:55:12PM +0100, Adrian Reber wrote:
> I tried to checkpoint and restore a runc container with today's git
> checkout. It works, but tcp-established is not really working.
> 
> I have container with a httpd running inside and I and connect to it
> using 'telnet rhel0x 80' to keep the connection established.
> 
> I then do 'runc checkpoint rhel7-httpd --tcp-established' and 'runc
> restore -d rhel7-httpd --tcp-established'. Both commands are working.

Does the container have its own network namespace? What network
configuration is used for this container?

> 
> In my telnet session I now type 'GET /' but I get a TCP reset:
> 
> 15:35:07.622294 IP dcbz.58608 > rhel0x.http: Flags [S], seq 1885340748, win 29200, options [mss 1460,sackOK,TS val 1499839760 ecr 0,nop,wscale 7], length 0
> 15:35:07.622342 IP rhel0x.http > dcbz.58608: Flags [S.], seq 1948584834, ack 1885340749, win 28960, options [mss 1460,sackOK,TS val 1521845 ecr 1499839760,nop,wscale 7], length 0
> 15:35:07.622409 IP dcbz.58608 > rhel0x.http: Flags [.], ack 1, win 229, options [nop,nop,TS val 1499839760 ecr 1521845], length 0
> 15:35:32.268394 IP dcbz.58608 > rhel0x.http: Flags [P.], seq 1:3, ack 1, win 229, options [nop,nop,TS val 1499864406 ecr 1521845], length 2
> 15:35:32.268433 IP rhel0x.http > dcbz.58608: Flags [R], seq 1948584835, win 0, length 0
> 
> https://lisas.de/~adrian/dump.log

(00.008968) Dumping inet socket at 3
(00.008972) 	Dumping: ino 0x   16f26 family    2 type    1 port        0 state  7 src_addr 0.0.0.0
(00.008974) 	Dumped: family 2 type 1 proto 6 port 0 state 7 src_addr 0.0.0.0
(00.008977) fdinfo: type: 0x 4 flags: 02000002/01 pos: 0x       0 fd: 3
(00.008991) 10989 fdinfo 4: pos: 0x               0 flags:          2000002/0x1
(00.008994) 	Searching for socket 16f27 (family 10.6)
(00.009001) No filter for socket
(00.009004) Dumping inet socket at 4
(00.009005) 	Dumping: ino 0x   16f27 family   10 type    1 port       80 state 10 src_addr ::
(00.009007) 	Dumped: family 10 type 1 proto 6 port 80 state 10 src_addr ::

I found only two tcp sockets and one has the TCP_LISTEN (10) state
and another one has the TCP_CLOSED(7) state. I exepect to find
a socket with the TCP_ESTABLISHED state in the log.

> https://lisas.de/~adrian/restore.log
> 
> I am using runc 1.0 rc2. I get the same behaviour with criu 2.3.
> 
> Any ideas what is wrong?
> 
> 		Adrian
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