Configure two environment for kubernetes within Azure

Question

Azure kubernetes service allows me to assign only one IP address to one cluster. I have created two namespaces within this cluster and I would like to distinguish those two namespaces by url as environments.

Namespaces

• stage
• dev

Desired access to those namespaces would be something like {namespace}.cloudapp.azure.com.

When defining ingress controller in each namespace the same ip address is assigned. How in general should I achieve this separation but keeping the same cluster?

Answer 1

For your use case you only need a single ingress controller. I.e. https://kubernetes.github.io/ingress-nginx/

To achieve this you need to add DNS entries for the namespaces leading to the single cluster IP. If you only want to access the two DNS names:

• stage.cloudapp.azure.com
• dev.cloudapp.azure.com

adding both entries is probably sufficient if you only want a single application in those namespaces. If you want to deploy multiple applications within the namespaces you should consider adding wildcard DNS entries for:

• *.stage.cloudapp.azure.com
• *.dev.cloudapp.azure.com

With this setup you can add ingresses of the following format:

  apiVersion: networking.k8s.io/v1
  kind: Ingress
  metadata:
    name: ingress-example-with-hostname
    namespace: dev
  spec:
  rules:
  - host: dev.cloudapp.azure.com
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: service
            port:
              number: 80

For further informations take a look at this documentation: https://kubernetes.io/docs/concepts/services-networking/ingress/#name-based-virtual-hosting