Kubernetes ingress IP is set to docker0 ip

0 votes

I'm trying to use the kubernetes ingress resource on bare metal with no cloud provider.

I created an ingress resource:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx
spec:
  rules:
  - host: foobar.com
    http:
      paths:
      - path: /foo
        backend:
          serviceName: echoheaders-x
          servicePort: 80
      - path: /
        backend:
          serviceName: frontend
          servicePort: 80

however, when I view the ingress, I get this IP:

[root@kubemaster]# kubectl get ing
NAME      HOSTS       ADDRESS      PORTS     AGE
nginx     foobar.com   172.17.0.1   80        12m

That IP address seems to correspond with the docker0 IP address on all my kubelet nodes.

Is there a way to set this IP? 

Here's my nginx-controller yaml:

---
apiVersion: v1
kind: ReplicationController
metadata:
  name: nginx-ingress-controller
  labels:
    k8s-app: nginx-ingress-lb
spec:
  replicas: 1
  selector:
    k8s-app: nginx-ingress-lb
  template:
    metadata:
      labels:
        k8s-app: nginx-ingress-lb
        name: nginx-ingress-lb
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - image: gcr.io/google_containers/nginx-ingress-controller:0.8.3
        name: nginx-ingress-lb
        imagePullPolicy: Always
        readinessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
        livenessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
          initialDelaySeconds: 10
          timeoutSeconds: 1
        # use downward API
        env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          - name: POD_NAMESPACE
            valueFrom:
              fieldRef:
                fieldPath: metadata.namespace
        ports:
        - containerPort: 80
          hostPort: 80
        - containerPort: 443
          hostPort: 443
        # we expose 18080 to access nginx stats in url /nginx-status
        # this is optional
        - containerPort: 18080
          hostPort: 18080
        args:
        - /nginx-ingress-controller
        - --default-backend-service=$(POD_NAMESPACE)/default-http-backend
        - --nginx-configmap=$(POD_NAMESPACE)/nginx-ingress-controller
Sep 10, 2018 in Kubernetes by lina
• 8,220 points
196 views

1 answer to this question.

0 votes

The issue here was the kubelet configuration. By default, the kubelet will listen on 0.0.0.0 and because docker0 is the first available address, it grabbed docker0's IP.

I added the following to the kubelet config:

--address=<actualip> --node-ip=<actualip>

And it registered correctly.

answered Sep 10, 2018 by Kalgi
• 52,350 points

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