Cannot access kubernetes service via outside network - networking

Question

I setup kubernetes environment with kubernetes 1.3.0, and running master and node on same host, I run a tomcat web application with one RC, one Service with docker, all seems running fine, I can access the service via internal network with curl command, but when I try to access the Service from Internet with public IP, it is failure.
The RC configure is:
apiVersion: v1
kind: ReplicationController
metadata:
name: myweb
spec:
replicas: 2
selector:
app: myweb
template:
metadata:
labels:
app: myweb
spec:
containers:
- name: myweb
image: kubeguide/tomcat-app:v1
ports:
- containerPort: 8080
env:
- name: MYSQL_SERVICE_HOST
value: "mysql"
- name: MYSQL_SERVICE_PORT
value: '3306'
The Service configure is:
apiVersion: v1
kind: Service
metadata:
name: myweb
spec:
type: NodePort
ports:
- port: 8080
nodePort: 30001
selector:
app: myweb
As you see, the Service listen the 30001 Port, when the port listen by Kubernetes Service, it cannot be accessed via Internet, but when I use
nc -l 30001
command on same host, it can be accessed via Internet, so that means the networking configure is fine on system layer.
For the iptables setting of host, I accept all connections, but the issue is still appeared.
then why can I access it with kubernetes service? is there any configure I miss?

Answer 1

To expose the kubernetes service using the host network you can use Ingress rules.
please refer: https://kubernetes.io/docs/concepts/services-networking/ingress/
In your case the ingress rule will be as follows.
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: nginx-test
spec:
rules:
- host: test.example.com
http:
paths:
- backend:
serviceName: myweb
servicePort: 30001
path: /