This a sidecar Docker container which can be used to generate flamegraphs for Python applications. It uses Uber pyflame library and flamegraph.pl script developed by Brendan Gregg.

In order to generate a flamegraph for an application you have to run this container in the same PID namespace as the application container. You also have to run it in priveledged mode or with SYS_ADMIN and SYS_PTRACE capabilities enabled:

# Start sidecar container in the same PID namespace as application container
docker run -it \ 
           --rm \ 
           --cap-add SYS_ADMIN \
           --cap-add SYS_PTRACE \
           --pid "container:<name or id of the application container>" \
           inikolaev/pyflame-docker-sidecar \
           ash

# Now you should be able to find the PID of your application and generate a flamegraph for it
pyflame -p <application pid> | flamegraph.pl > flamegraph.svg

I'm still figuring out a better way of running it automatically somehow. Raise an issue if you have an idea.

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