Add support for nginx-ingress in GKE Application Installer

Description

As part of our efforts to support easy deployment, configuration, and management of Kubernetes clusters we should consider making it easy to install an Ingress without a Google Load Balancer, and instead use the far cheaper Nginx. The Nginx-Ingress controller typically consumes less than 50mb of Ram and negligible CPU time. Meanwhile the Google Cloud Platform load balancer will at minimum cost customers $18.26 per month.

Proposal

Add an either OR option to the Ingress installer to accept Nginx as the load balancer, instead of the needlessly expensive Google Load Balancer option. Screen_Shot_2018-01-16_at_2.08.53_PM

Links / references

https://cloud.google.com/products/calculator/#id=ff949325-7719-44a7-89d6-5b780b2d7fb5 Screen_Shot_2018-01-16_at_2.17.03_PM