Table of contents

  1. Linkerd - Annotate default namespace
  2. Cluster Autoscaler Installation

Linkerd - Annotate default namespace

  • a. Verify that linkerd is installed as part of the terraform infrastructure deployment by checking the pods status under the “linkderd” namespace. This will enable linkerd/MTLS on all the microservices installed in the follow steps 
    kubectl annotate namespace default "linkerd.io/inject=enabled"

    linkerd

  • b. Verify annotation is in place: 
    kubectl get namespace default -o=jsonpath='{.metadata.annotations}'

    Should show “{“linkerd.io/inject”:”enabled”}”

  • c. If this is an update of the environment rather than a new install, restart the application pods in the default namespace for the linkerd sidecars to be injected into each pods. Should show 2/2 on the restarted pod.

Cluster Autoscaler Installation

Cluster Autoscaler is a helm chart deployment that horizontally autoscales cluster nodes when deployed on the cluster. The following parameter values need to be modified under charts/cluster-autoscaler/values.yaml file. These values should be fetched from the AWS console.

clusterName: <EXAMPLE_EKS_CLUSTER_NAME>
autoscalingGroups:
  - name: <EXAMPLE_AWS_AUTOSCALING_GROUP_NAME>
    maxSize: 5
    minSize: 3
awsRegion: us-east-1

helm repo add autoscaler https://kubernetes.github.io/autoscaler
helm upgrade --install cluster-autoscaler autoscaler/cluster-autoscaler -f ./cluster-autoscaler/values.yaml --namespace kube-system

To verify that cluster-autoscaler has started, run

kubectl --namespace=kube-system get pods -l "app.kubernetes.io/name=aws-cluster-autoscaler,app.kubernetes.io/instance=cluster-autoscaler"