We are trying to create an ExternalName service for Kubernetes to hide URL linking to our Firebase:
kind: Service
apiVersion: v1
metadata:
name: firebase
namespace: devel
spec:
type: ExternalName
externalName: firebase-project-123456.firebaseio.comThe service is created correctly, and we can ping to http://firebase. However connecting to the firebase endpoint doesn't work:
curl -v http://firebase/activity.json
< HTTP/1.1 404 Not Found
< Content-Type: text/html; charset=UTF-8
< Referrer-Policy: no-referrerOne idea is that there is an issue with https (as the target service runs on https), however then we wouldn't probably get 404, but some other error. I have no idea what might be wrong on the way.
You might be running into a virtual host issue. firebase-project-123456.firebaseio.com is a virtual host name which is then used to route your request to the correct backend. A Kubernetes external service is essentially a DNS CNAME, which forces a second DNS lookup for the actual host name.
See if this works for you:
curl -v -H "Host: firebase-project-123456.firebaseio.com" http://firebase/activity.jsonIf it does, that's what you're running into. You might have to make a trivially simple service instead, which proxies your requests to the correct URL at firebase.