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Re: How to make 172.30.0.1 (kubernetes service) health checked?



In OpenShift 3.9, when a master goes down the endpoints object should be updated within 15s (the TTL on the record for the master).  You can check the value of "oc get endpoints -n default kubernetes" - if you still see the master IP in that list after 15s then something else is wrong.

On Wed, Jun 27, 2018 at 9:33 AM, Joel Pearson <japearson agiledigital com au> wrote:
Hi,

I'm running OpenShift 3.9 on AWS with masters in HA mode using Classic ELB's doing TCP load balancing.  If I restart masters, from outside the cluster the ELB does the right thing and takes a master out of service.  However, if something tries to talk to the kubernetes API inside the cluster, it seems that kubernetes is unaware the master is missing, and I get failures when I'm serially restarting masters.

Is there some way that I can point the kubernetes service to use the load balancer?  Maybe I should update the kubernetes endpoint object to use the ELB IP address instead of the actual master addresses?  Is this a valid approach?  Is there some way with openshift-ansible I can tell the kubernetes service to use the load balancer when it creates the kubernetes service?

 Thanks,

Joel


apiVersion: v1
kind: Service
metadata:
  creationTimestamp: '2018-06-27T06:30:50Z'
  labels:
    component: apiserver
    provider: kubernetes
  name: kubernetes
  namespace: default
  resourceVersion: '45'
  selfLink: /api/v1/namespaces/default/services/kubernetes
  uid: a224fd75-79d3-11e8-bd57-0a929ba50438
spec:
  clusterIP: 172.30.0.1
  ports:
    - name: https
      port: 443
      protocol: TCP
      targetPort: 443
    - name: dns
      port: 53
      protocol: UDP
      targetPort: 8053
    - name: dns-tcp
      port: 53
      protocol: TCP
      targetPort: 8053
  sessionAffinity: ClientIP
  sessionAffinityConfig:
    clientIP:
      timeoutSeconds: 10800
  type: ClusterIP
status:
  loadBalancer: {}


apiVersion: v1
kind: Endpoints
metadata:
  creationTimestamp: '2018-06-27T06:30:50Z'
  name: kubernetes
  namespace: default
  resourceVersion: '83743'
  selfLink: /api/v1/namespaces/default/endpoints/kubernetes
  uid: a22a0283-79d3-11e8-bd57-0a929ba50438
subsets:
  - addresses:
      - ip: 10.2.12.53
      - ip: 10.2.12.72
      - ip: 10.2.12.91
    ports:
      - name: dns
        port: 8053
        protocol: UDP
      - name: dns-tcp
        port: 8053
        protocol: TCP
      - name: https
        port: 443
        protocol: TCP


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