Exercise 6.3: Working with ServiceAccounts - kubernetes API not working from inside a Pod

Hi,
I followed the exercise 6.3 and I created the following resources as explained in the PDF:
- secret
- serviceaccount
- clusterrole
- rolebinding
- pod
The only change I made is use an nginix:latest image instead of a busybox (to have curl).
For what I understood, after binding that role to the serviceaccount specified in the pod security context, I should be able to execute what I read here: https://kubernetes.io/docs/tasks/run-application/access-api-from-pod/#without-using-a-proxy
But I'm not..
2000@secondapp:/$ APISERVER=https://kubernetes.default.svc
SERVICEACCOUNT=/var/run/secrets/kubernetes.io/serviceaccount
NAMESPACE=$(cat ${SERVICEACCOUNT}/namespace)
TOKEN=$(cat ${SERVICEACCOUNT}/token)
CACERT=${SERVICEACCOUNT}/ca.crt
curl --cacert ${CACERT} --header "Authorization: Bearer ${TOKEN}" -X GET ${APISERVER}/api
curl: (6) Could not resolve host: kubernetes.default.svc
But getting the svc ip and doing a curl to the kubernetes ip (from inside the same pod), I got a response:
k get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
dep1 NodePort 10.99.123.7 8080:30002/TCP 47h
kubernetes ClusterIP 10.96.0.1 443/TCP 9d
nginx ClusterIP 10.110.7.220 443/TCP 30h
registry ClusterIP 10.107.115.230 5000/TCP 31h
2000@secondapp:/$ curl 10.96.0.1:443
Client sent an HTTP request to an HTTPS server.
This is the role:
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: secret-access-cr
rules:
- apiGroups:
- ""
resources: - secrets
verbs: - get
- list
- ""
I really appreciate who helps me to clarify that topic! :-)
Comments
-
Hi @SimoneZennaro,
Have you tried adding the cluster's domain
kubernetes.default.svc.cluster.local
?Additional information can be found in the documentation.
Regards,
-Chris0
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