Messages in this thread | | | Date | Wed, 9 Dec 2015 16:06:43 +0800 | From | Dongsheng Yang <> | Subject | Re: piping core dump to a program escapes container |
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On 12/09/2015 02:32 PM, Eric W. Biederman wrote: > Dongsheng Yang <yangds.fnst@cn.fujitsu.com> writes: > >> On 12/09/2015 11:29 AM, Eric W. Biederman wrote: >>> Dongsheng Yang <yangds.fnst@cn.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? > > The kernel rules say if there is a behavior someone depends on and that > behavior changes and breaks userspace that is a regression and it is not > allowed. > > As developers we try not to create regressions. But some days it > requires someone testing/using the functional enough to catdch an issue. > > That said the real issue you are likely to run into when developing this > as part of docker is that docker doesn't get to own the core pattern. > It doesn't make sense for any one application to, as it is a kernel wide > setting.
Agreed. > To have different app or container specific policies for core > dumping likely requires either solving the problems I mentioned with > containers or in userspace a solution so there can be an > /etc/core_pattern.d/ with different configuration and different scripts > that somehow know how to select which core files they want and dump them > sanely.
We would try to solve the problems you mentioned, but sound not easy. Anyway, I need to read some old discussion at first I think.
Thanx Yang > > Eric > > >
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