I am writing a simple docker file for a golang and I'm still getting familiar with docker so I know what I want to do just don't know how to do it:
What I have right now (below) is exposing port 8080, but I want to expose port 80 but forward that to port 8080.
I know that I can do it via docker run -p but I'm wondering if there's a way I can set it up in Dockerfile or something else. I'm trying to find how I can do that through Helm.
Dockerfile:
FROM scratch
COPY auth-service /auth-service
EXPOSE 8080
CMD ["/auth-service","-logtostderr=true", "-v=-1"]EXPOSE informs Docker that the container listens on the specified network ports at runtime but does not actually make ports accessible. only -p as you already mentioned will do that:
docker run -p :$HOSTPORT:$CONTAINERPORT
Or you can opt for a docker-compose file, extra file but also do the thing for you:
version: "2"
services:
my_service:
build: .
name: my_container_name
ports:
- 80:8080
.....
Edit:
If you are using helm you have just to use the exposed docker port as your targetPort :
apiVersion: v1
kind: Service
metadata:
name: {{ template "fullname" . }}
labels:
chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
spec:
type: {{ .Values.service.type }}
ports:
- port: {{ .Values.service.externalPort }}
targetPort: {{ .Values.service.internalPort }} #8080
protocol: TCP
name: {{ .Values.service.name }}
selector:
app: {{ template "fullname" . }}