Unable to connect to traced via websocket

[Jacob Ignatius]

Hi,

I'm trying connect to the traced service via the websocket ws://<ip>:8037/traced.

I have traced and traced_probes running. Then I started started a Perfetto tracing session.

Finally I started tracebox with  ./tracebox websocket_bridge I opened port 8037 in the firewall for two-way communication, but I am not able to connect using the Perfetto UI: https://ui.perfetto.dev/#!/record

Am I missing something? I did notice that tracebox is listening on 127.0.0.1, not 0.0.0.0. So is it not possible to connect from another machine on the same LAN?

[Steve Golton]

Hi Jacob,

As you already noted, websocket_bridge intentionally listens only on localhost (I believe for security reasons).

We recommend using ssh port forwarding to record a trace from another machine.

E.g.

ssh -L8037:localhost:8037 <remote-machine>

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[Jacob Ignatius]

Thanks Steve. I got that working now.