如何使用内部网络设置 k8s IP？

Question

Recently I decided to set up a k8s cluster on a few VM's.
I worked with K8s in the past but it's a long time since.
One of the things I want to run in the cluster is a web server with Nginx.

I have 3 VM's 1 master, 2 workers. They have each an external and internal IP.

I was wondering how I should set up k8s.
So I would want to use the external IP as my cluster IP but the nodes should communicate with the internal network.

How do I need to configure this?
I guess I need one of these options of the kubeadm init command but I am not sure?

--control-plane-endpoint
--apiserver-advertise-addres

If Someone could explain with an example that would be great!

Answer 1

I hope i understood you correctly, if not please update me.

So I would want to use the external IP as my cluster IP but the nodes should communicate with the internal network.

First of all your external IP need to be

apiVersion: v1
kind: Service
....
type: LoadBalancer

but the nodes should communicate with the internal network

For this purpose, you should use StaefulSet instead of deployment.

The main difference from your perspective (in order to answer your question) is the StatefulSet attaches a unique FQDN to your pod and this address is guaranteed to be "attached" to the pod when you reschedule it.

So you should have something like this:

• nginx - Exposed via LoadBalancer (external IP)
• apps - StatefulSet apps that have a unique IP and the Nginx can communicate with them using this IP.

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