Kubernetes Nginx Ingress Controller expose Nginx Webserver - docker

Question

I basically want to access the Nginx-hello page externally by URL. I've made a (working) A-record for a subdomain to my v-server running kubernetes and Nginx ingress: vps.my-domain.com
I installed Kubernetes via kubeadm on CoreOS as a single-node cluster using these tutorials: https://kubernetes.io/docs/setup/independent/install-kubeadm/, https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/, and nginx-ingress using https://kubernetes.github.io/ingress-nginx/deploy/#bare-metal.
I also added the following entry to the /etc/hosts file:
31.214.xxx.xxx vps.my-domain.com
(xxx was replaced with the last three digits of the server IP)
I used the following file to create the deployment, service, and ingress:
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-nginx
spec:
selector:
matchLabels:
run: my-nginx
replicas: 1
strategy:
type: Recreate
template:
metadata:
labels:
run: my-nginx
spec:
containers:
- name: my-nginx
image: nginx
ports:
- name: http
containerPort: 80
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: my-nginx
labels:
run: my-nginx
spec:
type: ClusterIP
ports:
- name: http
port: 80
protocol: TCP
targetPort: http
selector:
run: my-nginx
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: my-nginx
annotations:
kubernetes.io/ingress.class: "nginx"
ingress.kubernetes.io/ssl-redirect: "False"
spec:
rules:
- host: vps.my-domain.com
http:
paths:
- backend:
serviceName: my-nginx
servicePort: 80
Output of describe ing:
core#vps ~/k8 $ kubectl describe ing
Name: my-nginx
Namespace: default
Address:
Default backend: default-http-backend:80 (<none>)
Rules:
Host Path Backends
---- ---- --------
vps.my-domain.com
my-nginx:80 (<none>)
Annotations:
kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"extensions/v1beta1",...}
kubernetes.io/ingress.class: nginx
ingress.kubernetes.io/ssl-redirect: False
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal UPDATE 49m (x2 over 56m) nginx-ingress-controller Ingress default/my-nginx
While I can curl the Nginx hello page using the nodeip and port 80 it doesn't work from outside the VM. Failed to connect to vps.my-domain.com port 80: Connection refused
Did I forgot something or is the configuration just wrong? Any help or tips would be appreciated!
Thank you
EDIT:
Visiting "vps.my-domain.com:30519` gives me the nginx welcome page. But in the config I specified port :80.
I got the port from the output of get services:
core#vps ~/k8 $ kubectl get services --all-namespaces | grep "my-nginx"
default my-nginx ClusterIP 10.107.5.14 <none> 80/TCP 1h
I also got it to work on port :80 by adding
externalIPs:
- 31.214.xxx.xxx
to the my-nginx service. But this is not how it's supposed to work, right? In the tutorials and examples for kubernetes and ingress-nginx, it worked always without externalIPs. Also the ingress rules doesn't work now (e.g. if I set the path to /test).

Answer 1

So apparently I was missing one part: the load balancer. I'm not sure why this wasn't mentioned in those instructions as a requirement. But i followed this tutorial: https://kubernetes.github.io/ingress-nginx/deploy/baremetal/#a-pure-software-solution-metallb and now everything works.
Since metallb requires multiple ip addresses, you have to list your single ip-adress with the subnet \32: 31.214.xxx.xxx\32