Secure metrics server

Official metrics-server deploys onto Kubernetes is insecure.

This repo provides a way to generate metrics-server server certificate and key by Kubernetes CA. Then, deploys metrics-server in secure.

Prerequisite

• kubectl CLI
• kustomize CLI

Demo

KIND

1. Clone upstream metrics-server manifests.

   At here, we clone the current latest metrics-server tag v0.4.1, you could switch to your preferred metrics-server release version.

   git clone -b v0.4.1 [email protected]:kubernetes-sigs/metrics-server.git
   cd metrics-server/manifests
   git clone [email protected]:jenting/secure-metrics-server.git
   cd secure-metrics-server
   

2. Copy the Kubernetes CA certificate from remote machine to local machine.

   NODE_NAME=`kind get nodes`
   CONTAINER_ID=`docker ps --filter "name=$NODE_NAME" -q`
   docker cp $CONTAINER_ID:/etc/kubernetes/pki/ca.crt kubernetes-ca.crt
   

3. Run generate secure metrics-server patch manifests.

   ./secure-metrics-server.sh
   

4. Apply the kustomization.yaml file

   cd ../
   kustomize build secure-metrics-server | kubectl apply -f -
   

5. Check the metrics-server bahavior

   kubectl top nodes
   kubectl top pods