Making Kube service appProtocol field optional

[admgolovin]

What this PR does / why we need it:

This PR is making the appProtocol field of the Nginx ingress controller definition optional.

That is needed as not all Cloud providers could correctly work with it.
For example here is what happens when we expose our Nginx ingress-controller Kubernetes service through IBM Cloud NLB instance:

Events:
  Type     Reason                           Age                From                Message
  ----     ------                           ----               ----                -------
  Normal   EnsuringLoadBalancer             13s (x3 over 28s)  service-controller  Ensuring load balancer
  Warning  CreatingCloudLoadBalancerFailed  13s (x3 over 28s)  ibm-cloud-provider  Error on cloud load balancer afd6a32934ebe4cc89b782a88c9dea3a for service kube-system/nginx-ingress-dal10-3157072-controller-exp with UID fd6a3293-4ebe-4cc8-9b78-2a88c9dea3a8: Service configuration is not supported: application protocol
  Warning  SyncLoadBalancerFailed           13s (x3 over 28s)  service-controller  Error syncing load balancer: failed to ensure load balancer: Error on cloud load balancer afd6a32934ebe4cc89b782a88c9dea3a for service kube-system/nginx-ingress-dal10-3157072-controller-exp with UID fd6a3293-4ebe-4cc8-9b78-2a88c9dea3a8: Service configuration is not supported: application protocol

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

How Has This Been Tested?

Here is an example of the Nginx ingress Kubernetes service that is failing:

apiVersion: v1
kind: Service
metadata:
  annotations:
    meta.helm.sh/release-name: nginx-ingress
    meta.helm.sh/release-namespace: kube-system
    service.kubernetes.io/ibm-load-balancer-cloud-provider-enable-features: ipvs
    service.kubernetes.io/ibm-load-balancer-cloud-provider-ip-type: public
    service.kubernetes.io/ibm-load-balancer-cloud-provider-scheduler: rr
    service.kubernetes.io/ibm-load-balancer-cloud-provider-vlan: <vlan>
    service.kubernetes.io/ibm-load-balancer-cloud-provider-zone: <zone>
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: nginx-ingress
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/version: 1.0.4
    helm.sh/chart: ingress-nginx-4.0.6
    loadBalancerType: main
    nlbVersion: "2"
  name: nginx-ingress-dal10-3157072-controller-exp
  namespace: kube-system
spec:
  externalTrafficPolicy: Local
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: http
    appProtocol: http
  - name: https
    port: 443
    protocol: TCP
    targetPort: https
    appProtocol: https
  selector:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: nginx-ingress-dal10-3157072
    app.kubernetes.io/name: ingress-nginx
  sessionAffinity: None
  type: LoadBalancer

If we remove the appProtocol field, an IBM Cloud NLB instance will be created successfully for the Nginx ingress-controller service.
We also tried to roll back into the 4.0.0 version of the Nginx ingress-controller chart (before the appProtocol field was released). And it is working for us.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

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[k8s-ci-robot]

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[longwuyuan]

Does "optional" imply that the field is not set (by default to http/https) ?

[allen-servedio]

This feature was added in #7493. Even the author of that feature stated:

This is a minor change to make the deployment more semantic - although there is no particular reason to require this at this current time, having ports identify themselves makes life easier for any extensions / metrics scrapers / projects in future.

We have identified an edge case where this actually breaks things and so need to turn it off. So, in this case, the optionality of the feature is to have it on by default per the original author's intent with the ability to turn it off if needed @longwuyuan

[longwuyuan]

Can this be tested without IBM-Cloud. Say at least on a kind cluster. It would be appropriate to run at least some kind of tests, that assured non IBM-Cloud users don't see any impact at all.

[longwuyuan]

Also, if it is not too much trouble, then request that you create a issue and link it here. so that the issue tracks the details of the related information, for future searches. thanks. Sometimes directly creating PR seems ok but in my opinion, this one should have a issue that details the entire story with full specifics

[admgolovin]

Closes #7885

[admgolovin]

@longwuyuan That chart has been tested in the AWS EKS cluster as well. There are no breaking changes since those appProtocol fields are included in the Kubernetes service definition by default. We are just adding the ability to disable them if they don't needed.

[strongjz]

/check-cla
/triage accepted
/kind feature
/area helm
/priority important-longterm
/ok-to-test

[k8s-ci-robot]

@admgolovin: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-ingress-nginx-boilerplate	7ef34b3	link	true	/test pull-ingress-nginx-boilerplate

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[admgolovin]

@cpanato The rebase is done. All excessive commits have been squashed.

[rikatz]

argh sorry @admgolovin my bad!

We have just released a new version and there is another conflict.

Please fix both, and ping me (here or in Slack) so we can release this and fix the problem in IBM Cloud ASAP.

Thanks

[admgolovin]

@cpanato @rikatz The rebase is complete. PR is ready for merge.

[cpanato]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: admgolovin, cpanato

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