Deploying Mosquitto MQTT broker on Minikube, error while configuring an Ingress - minikube

Question

My goal in to install a simple Mosquitto broker on Minikube (without certificate).
Mu problem is that I cannot add an Ingress.
I am a real beginer in Kubernetes I hope this question is not stupid, I have searched for a solution without success.
So I have a VM (Vmware) with Ubuntu 20.04 on it.
Minikube 1.26 is running perfectly well on it (with Docker that is intalled on the VM) :
I have deployed Mosquitto on Minikube using the following yaml files :
apiVersion: apps/v1
kind: Deployment
metadata:
name: mosquitto
namespace: default
spec:
replicas: 1
selector:
matchLabels:
name: mosquitto
template:
metadata:
labels:
name: mosquitto
spec:
containers:
- name: mosquitto
image: eclipse-mosquitto:2.0.12
ports:
- containerPort: 1883
volumeMounts:
- name: mosquitto-config
mountPath: /mosquitto/config/mosquitto.conf
subPath: mosquitto.conf
- mountpath: etc/mosquitto
name: data
volumes:
- name: mosquitto-config
configMap:
name: mosquitto-configmap
- name: data
pesristentVolumeclaim:
claimName: moquitto-data
Persistent volume :
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mosquitto-data
namespace: default
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 5Gi
Config Map:
apiVersion: v1
kind: ConfigMap
metadata:
name: mosquitto-configmap
namespace: default
data:
mosquitto.conf: |
listener 1883
allow_anonymous true
protocol mqtt
persistence true
persistence_location /mosquitto/data
log_dest stdout
Service (NodePort type):
apiVersion: v1
kind: Service
metadata:
name: mosquitto-service
namespace: default
spec:
type: NodePort
selector:
name: mosquitto
ports:
- name: mosquitto
protocol: TCP
port: 1883
targetPort: 1883
I have then installed a ingress-ngninx controller to be able to do TCP o (ingress by itself only allows http and https).
minikube addons enable ingress
All seems to run good :
Now when I add my Ingress with the following yaml,
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
k8s.io/ingress-nginx : nginx
name: mosquitto-ingress
spec:
rules:
- host: talenddemo.net
tcp:
paths:
- path: /mqtt
backend:
serviceName: mosquitto-service
servicePort: 1883
the computer says "no". The error message is "The server could not find the requested resource"
Question 1 : What did I do wrong ?
Question 2 : With which address should I request connection to the MQTT broker from a MQTT client ?
Note : the namespace for the ingress controller is different from moquitto namesapce, would that be the cause ?
Many Thanks !!

Answer 1

You can not use normal ingress to expose native MQTT.
Ingress is used to expose HTTP based protocols, native MQTT is not HTTP based.
Nginx will not help in this case because you are still trying to set up http virtual host and http path proxying which still won't work.
You have 2 choices
Modify your mosquitto.conf to set the protocol to websockets. MQTT over Websockets is bootstrapped over HTTP so will work. This does mean you're clients will also need to use MQTT over Websockets.
Enable metallb and expose the service a load balancer on a dedicated IP address. This is a lot more work and will require a bunch of network planning.
You might be able to get nginx to work as a load balancer instead of metallb, but you will still need to expose as a load balanced service.
https://kubernetes.github.io/ingress-nginx/user-guide/exposing-tcp-udp-services/