Server gave HTTP response to HTTPS client

[akaas...@gmail.com]

I am trying to setup prometheus to monitor nodes, services and endpoints for my kubernetes cluster [1 master, 7 minions ] . For that I have a very basic promethus.yml file :

scrape_configs:
- job_name: 'kubernetes-pods'
  tls_config:
    insecure_skip_verify: true
  kubernetes_sd_configs:
  - role: pod

Before starting the Prometheus application , I ran the below 2 commands :

export KUBERNETES_SERVICE_HOST=172.9.25.6
export KUBERNETES_SERVICE_PORT=8080

I can access the Kubernetes API server using http://172.9.25.6:8080

The connect is formed over http and NOT https.

Now when I start the application, I get the below ERROR :

level=info ts=2017-12-13T20:39:05.312987614Z caller=kubernetes.go:100 component="target manager" discovery=k8s msg="Using pod service account via in-cluster config"
level=info ts=2017-12-13T20:39:05.313443232Z caller=main.go:371 msg="Server is ready to receive requests."
level=error ts=2017-12-13T20:39:05.316618074Z caller=main.go:211 component=k8s_client_runtime err="github.com/prometheus/prometheus/discovery/kubernetes/kubernetes.go:205: Failed to list *v1.Pod: Get https://172.9.25.6:8080/api/v1/pods?resourceVersion=0: http: server gave HTTP response to HTTPS client"

I also tried to add scheme: http to my prometheus.yml config but it does not work. How can I configure the client to accept HTTP responses ?

[Simon Pasquier]

Quickly looking at the k8s client code, it always assumes "https://" for in-cluster configurations. My bet is that you have to define the API address using the "api_server" parameter in the k8s SD configuration.

HTH

Simon

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