Default docker-compose influxDB+Grafana has issue hitting localhost API

Grafana k6 OSS Support
1

Hi, I have been trying k6 lately and it’s awesome!

Ran into an issue yesterday. I followed the instructions here (Grafana dashboards) to get the default dockerized k6+influxDB+Grafana running. It works perfectly fine when sending requests to any public APIs I tried. However when I tried to hit the API hosted on my local machine with the same dockerized setup, I got the following error:
WARN[0000] Request Failed error=“Get "https ://localhost:7110/weatherforecast": dial tcp 127.0.0.1:7110: connect: connect
ion refused”

I can hit this endpoint fine running ‘k6 run’ directly and can also curl works as well.

I created the localhost API by simply following the MS ‘created a web API with ASP. NET Core’ tutorial and used the template.

It seems to me docker compose got blocked by port 7110. Do I need to change docker-compose.yaml to open up this port? I tried to look up docker documentations but couldn’t figure it out myself.

Sorry I am new to both k6 and docker.

1 Like
2

Hi @yli,
welcome to the community forum :tada:

I expect you are misconfiguring the networking between containers. You can read more about Docker and Docker Compose networking on this documentation page and how to link containers.

3

Hi Ivan, thanks for getting back to me. I didn’t configure container network at all though. I used the default k6 config. The localhost API I am trying to hit is not in any container and was created in .net with 1 command line ‘dotnet new webapi -o weatherforecast’. k6, influxdb and grafana seem to communicate with each other totally fine inside docker containers since when I tried any real API on the internet, it works perfectly fine.