<p>I am hosting an application on GKE and would like to be able to let users from my organization access this application from the web. I would like them to be able to log-in using their Google Account IAM credentials.</p>

<p>Is there a way to configure a service exposing the clusters web endpoint such that to access this service the user simply needs to login with their google account?</p>

<p>For example, when testing a service I can easily do a web-preview in the cloud-shell and then access the web application in my browser.</p>

<p>Is there a way to configure this such that any users authorized in my organization can access the web interface of my application?</p>

<p><em>(Note, I asked the <a href="https://devops.stackexchange.com/q/4886/8189">same question on DevOps</a> but I feel like that site is not yet as active as it should be so I ask here as well)</em></p>

Inbar Rose
<p>Okay, I managed to make it work perfectly. But it took a few steps. I am including the manifest here that is required to setup the <a href="https://cloud.google.com/iap/" rel="nofollow noreferrer">IAP</a> <a href="https://cloud.google.com/iap/docs/enabling-kubernetes-howto" rel="nofollow noreferrer">using an ingress</a>. It requires a few things which I listed in the manifest below. Hopefully this can help others since I could not find a single source that had all of this put together. Essentially all you need to do is run <code>kubectl apply -f secure-ingress.yaml</code> to make everything work (as long as you have all the depenedencies) and then you just need to configure your <a href="https://cloud.google.com/iap/" rel="nofollow noreferrer">IAP</a> as you like it.</p>

<hr>

<p><strong><code>secure-ingress.yaml</code></strong></p>

<pre><code># Configure IAP security using ingress automatically
# requirements: kubernetes version at least 1.10.5-gke.3
# requirements: service must respond with 200 at / endpoint (the healthcheck)
# dependencies: need certificate secret my-secret-cert
# dependencies: need oath-client secret my-secret-oath (with my.domain.com configured)
# dependencies: need external IP address my-external-ip
# dependencies: need domain my.domain.com to point to my-external-ip IP
# dependencies: need an app (deployment/statefulset) my-app
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-secure-ingress
  namespace: default
  annotations:
    kubernetes.io/ingress.class: "gce"
    kubernetes.io/ingress.allow-http: "false"
    kubernetes.io/ingress.global-static-ip-name: my-external-ip
spec:
  tls:
  - secretName: my-secret-cert
  backend:
    serviceName: my-service-be-web
    servicePort: 1234
---
kind: Service
apiVersion: v1
metadata:
  name: my-service-be-web
  namespace: default
  annotations:
    beta.cloud.google.com/backend-config:
      '{"default": "my-service-be-conf"}'
spec:
  type: NodePort
  selector:
    app: my-app
  ports:
    - protocol: TCP
      port: 1234
      targetPort: 1234
      name: my-port-web
---
apiVersion: cloud.google.com/v1beta1
kind: BackendConfig
metadata:
  name: my-service-be-conf
  namespace: default
spec:
  iap:
    enabled: true
    oauthclientCredentials:
      secretName: my-secret-oath
</code></pre>
