Access to metric-server from a pod - kubernetes

Question

I have deployed the metric-server on my kubernetes cluster and it's just working fine as I run the following command:
kubectl get --raw /apis/metrics.k8s.io/v1beta1/nodes
I want to access the metric-server from a pod. For that, I use the service/metric-server's IP and it is in the same namespace that the metric-server is. The way I'm trying to access to the metric is like this:
myurl := fmt.Sprintf("https://%s:%s/apis/metrics.k8s.io/v1beta1/nodes/", serviceHost, servicePort)
u, err := url.Parse(myurl)
if err != nil {
panic(err)
}
req, err := http.NewRequest(httpMethod, u.String(), nil)
if err != nil {
log.Printf("Cant sned req: %s", err)
}
caToken, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/token")
if err != nil {
panic(err) // cannot find token file
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", string(caToken)))
caCertPool := x509.NewCertPool()
caCert, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/ca.crt")
if err != nil {
panic(err)
}
caCertPool.AppendCertsFromPEM(caCert)
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
RootCAs: caCertPool,
},
},
}
resp, err := client.Do(req)
if err != nil {
log.Printf("sending helm deploy payload failed: %s", err.Error())
panic(err)
}
This is not working nad the logs result for the pod is:
Get https://METRIC-SERVER-SERVICE-IP/apis/metrics.k8s.io/v1beta1/nodes: x509: certificate is valid for 127.0.0.1, not METRIC-SERVER-SERVICE-IP
Is this the right way to access the metric-server from a pod?

Answer 1

what i did so i can access the metrics-server on a local deployment:
set proper rbac
inside the pod :
export CURL_CA_BUNDLE=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
TOKEN=$(cat /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
curl -H "Authorization: Bearer $TOKEN" -k https://10.100.123.57/apis/metrics.k8s.io/v1beta1/nodes