Killercoda Ingress Create

Killercoda changed their subscription model while I was working on the courses. This specific task no longer exists and was replaced with the a Gateway API Exercise

I am planning to take the CKA exam in the near future. I work with Kubernetes daily at my job, but am mostly self taught, so it is probably realistic to say that I have some knowledge gaps. This blog is part of my preparation, where I go through all the scenarios on Killercoda.

Ingress Create

https://killercoda.com/killer-shell-cka/scenario/ingress-create

Creating services

There are two existing Deployments in Namespace world which should be made accessible via an Ingress.

First: create ClusterIP Services for both Deployments for port 80 . The Services should have the same name as the Deployments.

Lets check the existing deployments in the specified world namespace for deployments:

$ k get deploy -n world
NAME     READY   UP-TO-DATE   AVAILABLE   AGE
asia     2/2     2            2           5m38s
europe   2/2     2            2           5m38s

Since we attach a service to a Pod using a LabelSelector we need to figure out what labels are added to the pods:

$ k get deploy asia -oyaml -n world
...
  labels:
    app: asia
...
$ k get deploy europe -oyaml -n world
...
  labels:
    app: europe
...

Now based on the Service documentation we can write new services for both Deployments. (see here) & (see here). port is the port that the service exposes, targetPort is the port on the pod to attach to, which defaults to be the same as port if not specified and protocol defaults to TCP. The type ClusterIP specifies that a cluster internal IP address should be allocated.

apiVersion: v1
kind: Service
metadata:
  name: asia
  namespace: world
spec:
  selector:
    app: asia
  # type: ClusterIP # default behaviour
  ports:
    - port: 80
      # targetPort: 80 # default behaviour
      # protocol: TCP # default behaviour
---
apiVersion: v1
kind: Service
metadata:
  name: europe
  namespace: world
spec:
  selector:
    app: europe
  ports:
    - port: 80

Create Ingress for existing Services

The Nginx Ingress Controller has been installed.
Create a new Ingress resource called world for domain name world.universe.mine . The domain points to the K8s Node IP via /etc/hosts.
The Ingress resource should have two routes pointing to the existing Services:

http://world.universe.mine:30080/europe/
and
http://world.universe.mine:30080/asia/

Important to note is, that it is recommended to switch to Gateway API and that Ingress Nginx is deprecated as of March 2026.

Let’s check if we have an ingress class and the ingress-nginx controller is running:

$ k get ingressclass
NAME    CONTROLLER             PARAMETERS   AGE
nginx   k8s.io/ingress-nginx   <none>       14m

$ k get svc -n ingress-nginx
NAME                                 TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx-controller             NodePort    10.105.210.46   <none>        80:30080/TCP,443:30443/TCP   17m
ingress-nginx-controller-admission   ClusterIP   10.102.85.132   <none>        443/TCP                      17m

Let’s also validate the claim, that the domains are configured in the /etc/hosts file:

$ cat /etc/hosts
127.0.0.1 localhost
...
127.0.0.1 host01
127.0.0.1 controlplane
172.30.1.2 world.universe.mine

We can now write an Ingress manifest based on the documentation (see here) & (see here).

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata: 
  name: world
  namespace: world
spec:
  ingressClassName: nginx
  rules:
  - host: "world.universe.mine"
    http:
      paths:
      - pathType: Prefix
        path: "/europe"
        backend:
          service:
            name: europe
            port:
              number: 80
      - pathType: Prefix
        path: "/asia"
        backend:
          service:
            name: asia
            port:
              number: 80

Lets curl the domain name with the patchPrefix to see if we get a reply from the correct pods:

$ curl http://world.universe.mine:30080/europe/
hello, you reached EUROPE
root@controlplane:~$ curl http://world.universe.mine:30080/asia/
hello, you reached ASIA

Robin Meier

Ingress Create

Creating services

Create Ingress for existing Services