Re: Kernel tracing from inside a Docker container

[Mathieu Desnoyers via lttng-dev <lttng-dev@lists.lttng.org>]

Hi,

lttng-modules exposes its control ABI through the
virtual file /proc/lttng.

Does you container have access to that file ?

Note that if you give access to that file within the
container, then the container can observe detailed
information about kernel internals (including related
to other containers).

Thanks,

Mathieu

On 2024-11-06 02:38, Eibach, Dirk via lttng-dev wrote:
> Hi,
> 
> I want to do kernel tracing from inside a Docker container. 
> Kernel-tracing works from the host and the modules are loaded.
> Userspace tracing works inside the container. But when I do "lttng list 
> --kernel" from the container I get "Error: Unable to list kernel events: 
> Kernel tracer not available". Running in the container in priviledged 
> mode makes no difference.
> 
> Mit freundlichen Grüßen / Best Regards
> Dirk Eibach
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-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com