[Container-tools] DNS K8s Service issue with openshift 3.7 on minishift

[Charles Moulliard]

Hi,

I can't curl anymore a kube service using the service address with
Openshift 3.7 within the terminal of a pod/container.

Is there something broken/changed with internal DNS Server used by k8s
since openshift 3.6 ?

Here is the scenario followed to install Openshift, Demo project

# Setup minishift with Openshift
minishift version
minishift v1.9.0+a511b25

minishift --profile istio-demo config set image-caching true
minishift --profile istio-demo config set memory 3GB
minishift --profile istio-demo config set openshift-version v3.7.0
minishift --profile istio-demo config set vm-driver xhyve
minishift --profile istio-demo addon enable admin-user
minishift start --profile istio-demo

# Log and install the demo
oc login -u admin -p admin

pushd $(mktemp -d)
git clone git at github.com:snowdrop/spring-boot-quickstart-istio.git && cd
spring-boot-quickstart-istio
oc new-project demo
cd greeting-service
mvn clean package fabric8:deploy -Popenshift
cd ../say-service
mvn clean package fabric8:deploy -Popenshift

sleep 15s
oc get svc/say-service -o yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    app: say-service
    expose: "true"
    group: me.snowdrop
    provider: fabric8
    version: 1.0-SNAPSHOT
  name: say-service
  namespace: demo
spec:
  clusterIP: 172.30.197.92
  ports:
  - name: http
    port: 8080
    protocol: TCP
    targetPort: 8080
  selector:
    app: say-service
    group: me.snowdrop
    provider: fabric8
  sessionAffinity: None
  type: ClusterIP
status:
  loadBalancer: {}

# Rsh to the container

oc rsh $(oc get pods -o jsonpath='{.items[*].metadata.name}' -l
app=say-service)
sh-4.2$ curl http://localhost:8080/say
{"id":7,"content":"Hello, World!"}

sh-4.2$ curl http://$HOSTNAME:8080/say
{"id":8,"content":"Hello, World!"}sh-4.2

$ podIP=$(grep `hostname` /etc/hosts | awk '{print $1}')
sh-4.2$ echo $podIP
172.17.0.14
sh-4.2$ curl  $podIP:8080/say
{"id":9,"content":"Hello, World!"}

##### FAIL TO REPLY #######
sh-4.2$ curl http://say-service.demo.svc.cluster.local:8080/say
^C
sh-4.2$ curl http://say-service:8080/say
^C

Regards,

Charles
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