Install JupyterHub on EKS fails: "No suitable subnet for ELB"

Question

I am experiencing an issue on my EKS cluster (kubernetes version 1.14). I am trying to install JupyterHub (version 0.8.2) onto the EKS cluster, via helm+tiller.

Install appears to succeed, but the proxy-public service fails to create an ELB. See the output of "kubectl describe svc" below:

The app install/deployment fails with an error event.

> kubectl describe svc
...
Name:                     proxy-public
Namespace:                jhub
Labels:                   app=jupyterhub
                          chart=jupyterhub-0.8.2
                          component=proxy-public
                          heritage=Tiller
                          release=jhub
...
  Warning  CreatingLoadBalancerFailed  1m (x6 over 3m)  service-controller  Error creating load balancer (will retry): failed to ensure load balancer for service jhub/proxy-public: could not find any suitable subnets for creating the ELB

My EKS cluster is associated with 3 subnets, 2 private and 1 public. I would think that the ELB could be placed in the public subnet?

Answer 1

EKS requires subnets to be tagged in order to be used for load balancer creation. To be considered an eligible subnet, tag it with the following: kubernetes.io/role/elb: shared. For more info, see the knowledge portal article on subnet tagging for EKS.