<p>I'm trying to set up my mosquitto server inside a Kubernetes cluster and somehow I'm getting the following error and I can't figure out why.
Could someone help me?</p>

<p><strong>Error:</strong></p>

<pre><code>1551171948: mosquitto version 1.4.10 (build date Wed, 13 Feb 2019 00:45:38 +0000) starting
1551171948: Config loaded from /etc/mosquitto/mosquitto.conf.
1551171948: |-- *** auth-plug: startup
1551171948: |-- ** Configured order: http

1551171948: |-- with_tls=false
1551171948: |-- getuser_uri=/api/mosquitto/users
1551171948: |-- superuser_uri=/api/mosquitto/admins
1551171948: |-- aclcheck_uri=/api/mosquitto/permissions
1551171948: |-- getuser_params=(null)
1551171948: |-- superuser_params=(null)
1551171948: |-- aclcheck_paramsi=(null)
1551171948: Opening ipv4 listen socket on port 1883.
1551171948: Error: Cannot assign requested address
</code></pre>

<p><strong>Mosquitto.conf:</strong></p>

<pre><code>allow_duplicate_messages false

connection_messages true

log_dest stdout stderr
log_timestamp true
log_type all

persistence false



listener 1883 mosquitto

allow_anonymous true

# Public

# listener 8883 0.0.0.0

listener 9001 0.0.0.0
protocol websockets

allow_anonymous false

auth_plugin /usr/lib/mosquitto-auth-plugin/auth-plugin.so
auth_opt_backends http
auth_opt_http_ip 127.0.0.1
auth_opt_http_getuser_uri /api/mosquitto/users
auth_opt_http_superuser_uri /api/mosquitto/admins
auth_opt_http_aclcheck_uri /api/mosquitto/permissions
auth_opt_acl_cacheseconds 1
auth_opt_auth_cacheseconds 0
</code></pre>

<p><strong>Kubernetes.yaml:</strong></p>

<pre><code>apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: mosquitto
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: mosquitto
    spec:
      imagePullSecrets:
        - name: abb-login
      containers:
        - name: mosquitto
          image: ****mosquitto:develop
          imagePullPolicy: Always
          ports:
            - containerPort: 9001
              protocol: TCP
            - containerPort: 1883
              protocol: TCP
            - containerPort: 8883
              protocol: TCP

          resources: {}

---
apiVersion: v1
kind: Service
metadata:
  name: mosquitto
spec:
  ports:
    - name: "9001"
      port: 9001
      targetPort: 9001
      protocol: TCP
    - name: "1883"
      port: 1883
      targetPort: 1883
      protocol: TCP
    - name: "8883"
      port: 8883
      targetPort: 8883
      protocol: TCP
  selector:
    app: mosquitto
</code></pre>

<p>The problem is with the listener on port 1883, this can be determined because the log hasn't got to the 9001 listener yet.</p>

<p>The problem is most likely because mosquitto can not resolve the IP address of the hostname <code>mosquitto</code>. When passing a hostname the name must resolve to a valid IP address. The same problem has been discussed in <a href="https://stackoverflow.com/questions/54863408/facing-error-while-using-tls-with-mosquitto/54865869#54865869">this</a> recent answer. It could also be that <code>mosquitto</code> is resolving to an address that is not bound to any of the interfaces on the actual machine (e.g. if Address Translation is being used).</p>

<p>Also for the 9001 listener rather than passing <code>0.0.0.0</code> you can just not include a bind address and the default is to listen on all interfaces.</p>
