Grafana + Prometheus

Grafana Configuration
1

Hi,

I use docker-compose and all looks good, I can log in and see everything grafana and prometheus
but the two cannot communicate.
In the datasource for prometheus I get a
“HTTP Error Bad Request” message (without further detail)
error when pressing save&test and

in the dashboard all graphs has an error:
“invalid parameter ‘start’: cannot parse “” to a valid timestamp”

In the explorer I get
“invalid parameter ‘query’: 1:1: parse error: no expression found in input”
for whatever query.

How can I debug what could be wrong?

This in the CLI e.g. return a result that looks normal:
curl ‘http://172.23.0.4:9090/api/v1/query?query=up’

versions
Grafana v6.7.2 (423a25fc32)
Prometheus: v2.17.1

2 Likes
2

Not sure why/how it is related. But in my case it was the trickster which caused the problem. Once I directed the datasource directly to the prometheus. It seems to solve the problem

3

Getting the same issue.
Have you solved it?

4

Had the same issue trying to access the gitlab Prometheus service from a Grafana instance in Kubernetes (observability helm chart). I solved it by changing the HttpMethod from POST to GET in the Data Source configuration.