Is "Throttle" supported in the docker container?

Hi! Thank U for sitespeed.io, it’s a great tool! My question: is the Throttle engine supported in the docker container?

I tried running:

docker run --shm-size=1g --rm -v "$(pwd)":/sitespeed.io sitespeedio/sitespeed.io --browsertime.connectivity.engine throttle -c cable https://www.google.com

but I got several errors!

[soulgalore]

@marty90 correct, that will not work. You can setup different docker networks as in https://www.sitespeed.io/documentation/sitespeed.io/connectivity/#docker-networks but in practice, I haven’t seen anyone showing that running multiple browser instances will not affect each other, so I always run one test/URL at a time.

[soulgalore]

Hi @marty90 thanks for the kind words. Let me update the docs (https://www.sitespeed.io/documentation/sitespeed.io/connectivity/#throttle) the coming days, it is a little bit unclear.

It works like this: If you run throttle inside your container, the base OS needs to be Linux and you need to set the right sudo modprobe ifb numifbs=1 and then also give the container the privileges for the network: --cap-add=NET_ADMIN

For example, if you run on Ubuntu, you need to first run sudo modprobe ifb numifbs=1 and then docker run --shm-size=1g --cap-add=NET_ADMIN ....

If you use Docker on Mac it will not work. To be able to set the connectivity, you then need to run throttle outside of the container, see the last example here:

https://www.sitespeed.io/documentation/sitespeed.io/connectivity/#throttle

Best Peter