[Pkg-ganeti-devel] Bug#510965: Acknowledgement (ganeti: Ganeti does not work with python-twisted 8.1)

[Iustin Pop]

On Tue, Jan 27, 2009 at 01:52:46PM +0100, Daniel Schreiber wrote:
> Iustin Pop schrieb:
>> Thanks. This is starting to look like a different problem.
>>
>> The errno 9 we had before, but it should be solved. The strace shows
>> that the ganeti-noded is not actually listening, and the call_version
>> talks to a different host - it completes a connect(), while the node
>> daemon doesn't get any traffic.
>
> For some reason the listening socket is not included in the select list.  
> So it never accepts incoming connections.
> See lines 5861, 5863, 5920 in the strace.
>
>> I'll try to understand why you get the errno 9 error, but in the
>> meantime also a "lsof -p $pid_of_node_daemon" and an strace of the node
>> daemon startup would be helpful to understand in what state a node
>> daemon is.
>
> Twisted included a closed file descriptor in the select list.

Ok, so it seems our cleaning up/closing filedescriptors is conflicting
with twisted opening some pipes for itself. Why it only does in some
cases and not always it's a mistery to me.

In any case, could you try and run the node daemon in foreground
(ganeti-noded -f)? In the non-daemon case, we don't cleanup the file
descriptors, and this will confirm or infirm my theory.

If this is the problem, we could backport a patch from trunk that closes
the file descriptors very very early in the startup sequence, and not
after forking.

regards,
iustin