Install cluster extension

Install the Metrics-server extension for the Kubernetes cluster

As first Kubernetes cluster extension we will install metrics-server. The easiest way to get it working is to use helm project.

Install Helm

Install Helm client on your workstation

Every Helm release provides a command line binary for any operating system. These versions can be manually downloaded and installed.

Get your desired latest version of Helm:

wget https://get.helm.sh/helm-v3.10.3-linux-amd64.tar.gz

Extract the tarball archive to your local filesystem:

tar -xvzf helm-v3.10.3-linux-amd64.tar.gz

Install helm client in /usr/local/bin:

sudo install -m 755 linux-amd64/helm /usr/local/bin/helm

Check if the installation was successful using the helm command:

helm version

Output:

version.BuildInfo{Version:"v3.10.3", GitCommit:"835b7334cfe2e5e27870ab3ed4135f136eecc704", GitTreeState:"clean", GoVersion:"go1.18.9"}

As the last step, add the autocompletion bash functions to your shell:

helm completion bash
source <(helm completion bash)
echo "source <(helm completion bash)" >> ~/.bashrc

Install metrics-server

After helm command is working we can finally install metrics-server on Kubernetes cluster.

First add Helm chart repository:

helm repo add metrics-server https://kubernetes-sigs.github.io/metrics-server/
helm repo update

Install the chart on the Kubernetes cluster:

helm install --create-namespace -n metrics-server \
                metrics-server \
                metrics-server/metrics-server \
                --set args={--kubelet-insecure-tls}

Wait a few seconds until helm install finishes, then check the status:

helm list -n metrics-server
helm status -n metrics-server metrics-server

Now, you can observe Kubernetes cluster resource usage in real-time:

kubectl top nodes
kubectl top pods -n metrics-server
kubectl top pods -n kube-system
kubectl top pods -A