Question

How to forward port '8080 (container)->8080 (service)-> 8080 (ingress)->80 (browser)'? How is it done?

Answer 1

• The ingress is exposing port 80 externally for the browser to access, and connecting to a service that listens on 8080. 

• The ingress will listen on port 80 by default. 

• An "ingress controller" is a pod that receives external traffic and handles the ingress  and is configured by an ingress resource.

• For this you need to configure ingress selector and if no 'ingress controller selector' is specified then no ingress controller will control the ingress.

• simple ingress Config will look like:

host: abc.org
http:
paths:
backend:
serviceName: abc-service
servicePort: 8080

Then the service will look like:

kind: Service
apiVersion: v1
metadata:
name: abc-service
spec:
ports:
protocol: TCP
port: 8080 # this is the port the service listens on
targetPort: 8080