[lttng-dev] LTTng on Docker

[Jérémie Galarneau]

On 10 April 2017 at 14:06, Jeffrey Chen <cpthk at live.com> wrote:

> I have attached the logs from the lttng daemon. I could see errors like
> below.
>
>
> Error: Error creating UST channel "channel0" on the consumer daemon
>
>
> My commands to create a session are:
>
> lttng create test
> lttng enable-channel --session test --userspace --tracefile-size 8388608
> --subbuf-size 8388608 channel0
> lttng enable-event --channel channel0 --userspace "service:*"
> lttng add-context -u -t vtid
> lttng add-context -u -t vpid
> lttng start
>

Thanks for the info. Can you try to create the channel with the default
values and see if it works?

$ lttng enable-channel --session test --userspace channel0

Also, can you re-capture the session daemon logs launching it with the
"-vvv --verbose-consumer" option since the problem appears to occur on the
consumer's end.

Thanks,
Jérémie


> Installed:
> apt-get -y install lttng-tools lttng-modules-dkms liblttng-ust0
> liblttng-ust-dev
>
> Thanks.
>
> ------------------------------
> *From:* jeremie.galarneau at gmail.com <jeremie.galarneau at gmail.com> on
> behalf of Jérémie Galarneau <jeremie.galarneau at efficios.com>
> *Sent:* Sunday, April 9, 2017 2:06 PM
> *To:* Jeffrey Chen
> *Cc:* lttng-dev at lists.lttng.org
> *Subject:* Re: [lttng-dev] LTTng on Docker
>
> On 7 April 2017 at 18:35, Jeffrey Chen <cpthk at live.com> wrote:
> > Hi:
> >
> >
> > I am trying to have LTTng UST tracing inside a docker container. I wasn't
> > able to get the UST tracing working. LTTng would not write any UST trace
> > files in the directory, even though it printed it would. Has it been
> tested
> > before? Is there any known problem?
>
> Tracing inside a container (not Docker), where the LTTng daemons and
> the applications are running in the same container, is known to work
> as this is how most of the LTTng CI works.
>
> As far as Docker is concerned, I tested it a number of times and it
> worked. Can you provide the versions of LTTng and Docker you're using
> and the session daemon's logs (launching it with the -vvv option)?
>
> Thanks,
> Jérémie
>
> >
> >
> > $ lttng enable-channel --session test --userspace channel0
> >
> > Error: Channel channel0: UST create channel failed (session
> ServiceFabric_0)
> > Error: Command error
> >
> >
> > Thanks.
> >
> >
> >
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>
> --
> Jérémie Galarneau
> EfficiOS Inc.
> http://www.efficios.com
> EfficiOS <http://www.efficios.com/>
> www.efficios.com
> At EfficiOS, our main goal is diminishing the amount of time our clients
> spend identifying faults. We also enable our clients' applications to scale
> on massive multi ...
>
>


-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com
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