Monitor Cloud IAP Setup

Instructions for monitoring and troubleshooting Cloud IAP

Cloud Identity-Aware Proxy (Cloud IAP) is the recommended solution for accessing your Kubeflow deployment from outside the cluster, when running Kubeflow on Google Cloud Platform (GCP).

This document is a step-by-step guide to ensuring that your IAP-secured endpoint is available, and to debugging problems that may cause the endpoint to be unavailable.

Introduction

When deploying Kubeflow using the deployment UI or the command-line interface, you choose the authentication method you want to use. One of the options is Cloud IAP. This document assumes that you have already deployed Kubeflow.

Kubeflow uses the Let’s Encrypt service to provide an SSL certificate for the Kubeflow UI.

Cloud IAP gives you the following benefits:

  • Users can log in in using their GCP accounts.
  • You benefit from Google’s security expertise to protect your sensitive workloads.

Monitoring your Cloud IAP setup

Follow these instructions to monitor your Cloud IAP setup and troubleshoot any problems:

  1. Examine the Ingress and Google Cloud Build (GCB) load balancer to make sure it is available:

     kubectl -n istio-system describe ingress
    
     Name:             envoy-ingress
     Namespace:        kubeflow
     Address:          35.244.132.160
     Default backend:  default-http-backend:80 (10.20.0.10:8080)
     Events:
        Type     Reason     Age                 From                     Message
        ----     ------     ----                ----                     -------
        Normal   ADD        12m                 loadbalancer-controller  kubeflow/envoy-ingress
        Warning  Translate  12m (x10 over 12m)  loadbalancer-controller  error while evaluating the ingress spec: could not find service "kubeflow/envoy"
        Warning  Translate  12m (x2 over 12m)   loadbalancer-controller  error while evaluating the ingress spec: error getting BackendConfig for port "8080" on service "kubeflow/envoy", err: no BackendConfig for service port exists.
        Warning  Sync       12m                 loadbalancer-controller  Error during sync: Error running backend syncing routine: received errors when updating backend service: googleapi: Error 400: The resource 'projects/code-search-demo/global/backendServices/k8s-be-32230--bee2fc38fcd6383f' is not ready, resourceNotReady
      googleapi: Error 400: The resource 'projects/code-search-demo/global/backendServices/k8s-be-32230--bee2fc38fcd6383f' is not ready, resourceNotReady
        Normal  CREATE  11m  loadbalancer-controller  ip: 35.244.132.160
     ...
    

    Any problems with creating the load balancer are reported as Kubernetes events in the results of the above describe command.

    • If the address isn’t set then there was a problem creating the load balancer.

    • The CREATE event indicates the load balancer was successfully created on the specified IP address.

    • The most common error is running out of GCP quota. To fix this problem, you must either increase the quota for the relevant resource on your GCP project or delete some existing resources.

  2. Verify that a signed SSL certificate was generated from Let’s Encrypt:

      kubectl -n istio-system get certificate envoy-ingress-tls  -o yaml
    
      apiVersion: certmanager.k8s.io/v1alpha1
      kind: Certificate
      metadata:
        creationTimestamp: 2019-04-02T22:49:43Z
        generation: 1
        labels:
          kustomize.component: iap-ingress
        name: envoy-ingress-tls
        namespace: istio-system
        resourceVersion: "4803"
        selfLink: /apis/certmanager.k8s.io/v1alpha1/namespaces/kubeflow/certificates/envoy-ingress-tls
        uid: 9b137b29-5599-11e9-a223-42010a8e020c
      spec:
        acme:
          config:
          - domains:
            - mykubeflow.endpoints.myproject.cloud.goog
            http01:
              ingress: envoy-ingress
        commonName: kf-vmaster-n01.endpoints.kubeflow-ci-deployment.cloud.goog
        dnsNames:
        - mykubeflow.endpoints.myproject.cloud.goog
        issuerRef:
          kind: ClusterIssuer
          name: letsencrypt-prod
        secretName: envoy-ingress-tls
      status:
        acme:
          order:
            url: https://acme-v02.api.letsencrypt.org/acme/order/54483154/382580193
        conditions:
        - lastTransitionTime: 2019-04-02T23:00:28Z
          message: Certificate issued successfully
          reason: CertIssued
          status: "True"
          type: Ready
        - lastTransitionTime: null
          message: Order validated
          reason: OrderValidated
          status: "False"
          type: ValidateFailed
    

    It can take around 10 minutes to provision a certificate after the creation of the load balancer.

    The most recent condition should be Certificate issued successfully.

    The most common error is running out of Let’s Encrypt quota. Let’s Encrypt enforces a quota of 5 duplicate certificates per week.

    The easiest fix to quota issues is to pick a different hostname by recreating and redeploying Kubeflow with a different name.

    For example if you originally ran the following kfctl init command:

    kfctl init myapp --project=myproject --config=myconfig -V
    

    Then rerun kfctl init with a different name that you haven’t used before:

    kfctl init myapp-unique --project=myproject --config=myconfig -V
    
  3. Wait for the load balancer to report the back ends as healthy:

     kubectl describe -n istio-system ingress envoy-ingress
    
     ...
     Annotations:
      kubernetes.io/ingress.global-static-ip-name:  kubeflow-ip
      kubernetes.io/tls-acme:                       true
      certmanager.k8s.io/issuer:                    letsencrypt-prod
      ingress.kubernetes.io/backends:               {"k8s-be-31380--5e1566252944dfdb":"HEALTHY","k8s-be-32133--5e1566252944dfdb":"HEALTHY"}
     ...
    

    Both backends should be reported as healthy. It can take several minutes for the load balancer to consider the back ends healthy.

    The service with port 31380 is the one that handles Kubeflow traffic. (31380 is the default port of the service istio-ingressgateway.)

    If the backend is unhealthy, check the pods in istio-system:

    • kubectl get pods -n istio-system
    • The istio-ingressgateway-XX pods should be running
    • Check the logs of backend-updater-0, ingress-bootstrap-XX, iap-enabler-XX to see if there is any error
  4. Now that the certificate exists, the Ingress resource should report that it is serving on HTTPS:

    kubectl -n istio-system get ingress
    NAME            HOSTS                                                        ADDRESS          PORTS     AGE
    envoy-ingress   mykubeflow.endpoints.myproject.cloud.goog   35.244.132.159   80, 443   1d
    

    If you don’t see port 443, look at the Ingress events using kubectl describe to see if there are any errors.

  5. Try accessing Cloud IAP at the fully qualified domain name in your web browser:

    https://<your-fully-qualified-domain-name>     
    

    If you get SSL errors when you log in, this typically means that your SSL certificate is still propagating. Wait a few minutes and try again. SSL propagation can take up to 10 minutes.

    If you do not see a login prompt and you get a 404 error, the configuration of Cloud IAP is not yet complete. Keep retrying for up to 10 minutes.

  6. If you get an error Error: redirect_uri_mismatch after logging in, this means the list of OAuth authorized redirect URIs does not include your domain.

    The full error message looks like the following example and includes the relevant links:

    The redirect URI in the request, https://mykubeflow.endpoints.myproject.cloud.goog/_gcp_gatekeeper/authenticate, does not match the ones authorized for the OAuth client. 
    To update the authorized redirect URIs, visit: https://console.developers.google.com/apis/credentials/oauthclient/22222222222-7meeee7a9a76jvg54j0g2lv8lrsb4l8g.apps.googleusercontent.com?project=22222222222
    

    Follow the link in the error message to find the OAuth credential being used and add the redirect URI listed in the error message to the list of authorized URIs. For more information, read the guide to setting up OAuth for Cloud IAP.

Expiry of the SSL certificate from Let’s Encrypt

Kubeflow runs an agent in your cluster to renew the Let’s Encrypt certificate automatically. You don’t need to take any action. For more information, see the Let’s Encrypt documentation.

For questions and support about the certificate, visit Let’s Encrypt support.