HTTPS load balancer in Google Container Engine

I just walked through the example and (prior to opening up a firewall for $NODE_PORT) saw the same 502 error.

If you look in the cloud console at

https://console.developers.google.com/project/<project>/loadbalancing/http/backendServices/details/web-map-backend-service

you should see that the backend shows 0 out of ${num_nodes_in_cluster} as healthy.

For your firewall definition, make sure that you set the source filter to 130.211.0.0/22 to allow traffic from the the load balancing service and set the allowed protocols and ports to tcp:$NODE_PORT.

I had the same problem with my application, the problem is that we did not have an endpoint returning "Success" and the health checks were always failing.

It seems that the HTTP/HTTPS load balancer will not send the request to the cluster nodes if the health checks are not passing, so my solution was to create an endpoint that always returns 200 OK, and as soon as the health checks were passing, the LB started working.