Kubernetes Cluster on AWS with Kops - NodePort Service Unavailable

By default Kops does not configure the EC2 instances to allows NodePort traffic from outside.

In order for traffic outside of the cluster to reach the NodePort you must edit the configuration for your EC2 instances that are your Kubernetes nodes in the EC2 Console on AWS.

Once in the EC2 console click "Security groups." Kops should have annotated the original Security groups that it made for your cluster as nodes.<your cluster name> and master.<your cluster name>

We need to modify these Security Groups to forward traffic from the default port range for NodePorts to the instances.

Click on the security group, click on rules and add the following rule.

Port range to open on the nodes and master: 30000-32767

This will allow anyone on the internet to access a NodePort on your cluster, so make sure you want these exposed.

Alternatively instead of allowing it from any origin you can allow it only from the security group created by for the ALB by the alb-ingress-controller. However, since these can be re-created it will likely be necessary to modify the rule on modifications to the kubernetes service. I suggest specifying the NodePort explicitly to it is a predetermined known NodePort rather than a randomly assigned one.

The SG of master is not needed to open the nodeport range in order to make : working.

So only the Worker's SG needs to open the port range.