Flamegraphs in docker?

me_0943 · 2015-06-15T18:36:43+00:00

Thank you I was not aware of that method :)Ideally I would have preferred just a format like:{{name="Host",value="domain.com"},{..},...}But I should be able...

Flamegraphs in docker?

me_0943

Has anyone managed to generate flame graphs for openresty when running it inside of a docker container?

I've done some initial tests without much success so I'm interested to see if it's at least possible before I continue investigating.

Cheers,

Chris

ddragosd

Hi Chris, did you get any luck with this in the meanwhile ? I was also thinking these days if it's easily doable, thinking to give it a try myself too.

Thanks,

dragos

On Monday, June 15, 2015 at 3:36:43 AM UTC-7, Chris Tanner wrote:

Has anyone managed to generate flame graphs for openresty when running it inside of a docker container?
I've done some initial tests without much success so I'm interested to see if it's at least possible before I continue investigating.

Cheers,
Chris

lordnynex

I'm not sure docker is important here, is it? Unless you want to run systemtap from within the docker instance? If so, I would assume you need to start the container in privileged mode.

External to the container should be normal though, I think. It's just a matter of running a kernel new enough to have the userspace tracing instrumentation or the utrace patch. Also a new version of systemtap (read: not from apt)

Can you provide any more detail on what kernel version, what systemtap version, etc.

On Wed, Aug 12, 2015 at 1:57 PM, Dragos Dascalita Haut <ddr...@gmail.com> wrote:

Hi Chris, did you get any luck with this in the meanwhile ? I was also thinking these days if it's easily doable, thinking to give it a try myself too.

Thanks,
dragos

On Monday, June 15, 2015 at 3:36:43 AM UTC-7, Chris Tanner wrote:
Has anyone managed to generate flame graphs for openresty when running it inside of a docker container?
I've done some initial tests without much success so I'm interested to see if it's at least possible before I continue investigating.

Cheers,
Chris

.

me_0943

I tried running within docker with privileged mode but didn't have any luck. For now I'm just running the whole thing outside of docker, but I might have another go this week

On Wednesday, August 12, 2015 at 11:36:41 PM UTC+1, Lord Nynex wrote:

I'm not sure docker is important here, is it? Unless you want to run systemtap from within the docker instance? If so, I would assume you need to start the container in privileged mode.

External to the container should be normal though, I think. It's just a matter of running a kernel new enough to have the userspace tracing instrumentation or the utrace patch. Also a new version of systemtap (read: not from apt)

Can you provide any more detail on what kernel version, what systemtap version, etc.

On Wed, Aug 12, 2015 at 1:57 PM, Dragos Dascalita Haut <ddra...@gmail.com> wrote:
Hi Chris, did you get any luck with this in the meanwhile ? I was also thinking these days if it's easily doable, thinking to give it a try myself too.

Thanks,
dragos

On Monday, June 15, 2015 at 3:36:43 AM UTC-7, Chris Tanner wrote:
Has anyone managed to generate flame graphs for openresty when running it inside of a docker container?
I've done some initial tests without much success so I'm interested to see if it's at least possible before I continue investigating.

Cheers,
Chris

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