Redirecting traffic to external url - google-cloud-platform

Question

Updates based on comments:
Lets say there's an API hosted # hello.company1.com in another GCP Project...
I would like to have a possibility that when some1 visits a url abc.company.com they are serverd traffic from hello.company1.com something similar to an API gateway...
It could be easily done with an API gateway, I am just trying to figure out if its possible to with K8S service & ingress.
I have created a Cloud DNS zone as abc.company.com
When someone would visit abc.company.com/google I would like the request to be forwarded to an external url let's say google.com
Could this be achieved by creating a service of type external name and an ingress with host name abc.company.com
kind: Service
apiVersion: v1
metadata:
name: test-srv
spec:
type: ExternalName
externalName: google.com
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: test-ingress
spec:
rules:
- host: abc.company.com
- http:
paths:
- path: /google
backend:
serviceName: test-srv

Answer 1

It's possible to achieve what you want, however you will need to use Nginx Ingress to do that, as you will need to use specific annotation - nginx.ingress.kubernetes.io/upstream-vhost.
It was well described in this Github issue based on storage.googleapis.com.
apiVersion: v1
kind: Service
metadata:
name: google-storage-buckets
spec:
type: ExternalName
externalName: storage.googleapis.com
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: proxy-assets-ingress
annotations:
kubernetes.io/ingress.class: nginx-ingress
nginx.ingress.kubernetes.io/rewrite-target: /[BUCKET_NAME]/[BUILD_SHA]
nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
nginx.ingress.kubernetes.io/upstream-vhost: "storage.googleapis.com"
spec:
rules:
- host: abc.company.com
http:
paths:
- path: /your/path
backend:
serviceName: google-storage-buckets
servicePort: 443
Depends on your needs, if you would use it on non https you would need to change servicePort to 80 and remove annotation nginx.ingress.kubernetes.io/backend-protocol: "HTTPS".
For additional details, you can check other similar Stackoverflow question.
Please remember to not use - in spec.rules.host and spec.rules.http in the same manifest. You should use - only with http, if you don't have host in your configuration.