linux-kernel - Re: piping core dump to a program escapes container

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Date:	Wed, 9 Dec 2015 13:53:00 +0800
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Shayan Pooya <shayan@...eve.org>, <cgroups@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Richard Weinberger <richard@....at>,
	<containers@...ts.linux-foundation.org>
Subject: Re: piping core dump to a program escapes container

On 12/09/2015 11:29 AM, Eric W. Biederman wrote:
> Dongsheng Yang <yangds.fnst@...fujitsu.com> writes:
>
[...]

> There has not yet been an obvious namespace in which to stick
> core_pattern, and even worse exactly how to appropriate launch a process
> in a container has not been figured out.
>
> If those tricky problems can be solved we can have a core_pattern in a
> container.  What we have now is the best we have been able to figure out
> so far.

Thanx Eric, but if I want to make docker works rely on this behaviour,
is that reliable?

I mean, I want to make a docker container to dump the
core file to a specified path in host by a pipe way. But I am afraid
this behaviour would be changed later. Any suggestion?

Yang
>
> Eric
>
>
>>
>> Yang
>>>
>>> Yang
>>>>
>>>> Currently, I work around this issue by detecting that the process is
>>>> crashing from a container (by comparing the namespace pid to the
>>>> global pid) and refuse to dump the core if it is from a container.
>>>>
>>>> Tested on Ubuntu (kernel 3.16) and Fedora (kernel 4.1).
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>>>
>>>
>>>
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> .
>



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