:orphan:

.. _installmetricsserver:

Install metrics server in Kubernetes
------------------------------------

The Metrics Server is a vital component in the Kubernetes ecosystem, providing valuable insights into resource usage across pods and nodes. It is the source of container resource metrics for auto-scaling objects in Kubernetes

Metrics Server collects resource metrics from Kubelets and exposes them in Kubernetes apiserver through Metrics API

Install the metrics server

.. code-block::

    kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

Validate metrics server is installed

.. code-block::

    kubectl get pods -n kube-system

.. note::

    After installation, you may find that metrics server is not in running state and 
    "kubectl get apiservices" will show MissingEndpoints
          v1beta1.metrics.k8s.io      kube-system/metrics-server   False (MissingEndpoints)
    
    To fix this, you need to edit the deployment for metrics-server using below command

        kubectl edit deployment metrics-server -n kube-system

    This will open the deployment yaml in an editor.
     You can add an argument --kubelet-insecure-tls to existing args section. The new args section will look like below

        containers:
        - args:
        - - cert-dir=/tmp
        - - kubelet-insecure-tls

     Now you can verify that metrics server is running as expected
     
     After metrics server is in running state, commands like **kubectl top pods** will work