Creating a Kubernetes Ingress resource for GCP/GKE by example

Question

I'm trying to make sense of an example Kubernetes YAML config file that I am trying to customize:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-web-server
  namespace: myapp
  annotations:
    kubernetes.io/ingress.class: alb
    alb.ingress.kubernetes.io/scheme: internal
    alb.ingress.kubernetes.io/security-groups: my-sec-group
    app.kubernetes.io/name: my-alb-ingress-web-server
    app.kubernetes.io/component: my-alb-ingress
spec:
  rules:
    - http:
        paths:
          - path: /*
            backend:
              serviceName: my-web-server
              servicePort: 8080

The documentation for this example claims its for creating an "Ingress", or a K8s object that manages inbound traffic to a service or pod.

This particular Ingress resource appears to use AWS ALB (Application Load Balancers) and I need to adapt it to create and Ingress resource in GCP/GKE.

I'm Googling the Kubernetes documentation high and low and although I found the kubernetes.io/ingress.class docs I don't see where they define "alb" as a valid value for this property. I'm asking because I obviously need to find the correct kubernetes.io/ingress.class value for GCP/GKE and I assume if I can find the K8s/AWS Ingress documentation I should be able to find the K8s/GCP Ingress documentation.

I'm assuming K8s has AWS, GCP, Azure, etc. built-in client to kubectl for connecting to these clouds/providers?

So I ask: how does the above configuration tell K8s that we are creating an AWS Ingress (as opposed to an Azure Ingress, GCP Ingress, etc.) and where is the documentation for this?

Answer 1

The documentation you're looking for is : https://cloud.google.com/kubernetes-engine/docs/concepts/ingress https://cloud.google.com/kubernetes-engine/docs/how-to/ingress-multi-ssl

An example of an ingress resource :

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata: 
       name: ingress-front-api
       namespace: example
       annotations:
             networking.gke.io/managed-certificates: "front.example.com, api.example.com"
             kubernetes.io/ingress.global-static-ip-name: "prod-ingress-static-ip"
spec:
  rules:
  - host: front.example.com
    http:
          paths:
          - backend:
                service:
                      name: front
                      port:
                            number: 80
          path: /*
          pathType: ImplementationSpecific
 - host: api.example.com
    http:
          paths:
          - backend:
                service:
                      name: api
                      port:
                            number: 80
          path: /*
          pathType: ImplementationSpecific