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Vertical Pod Autoscaling

YouTube Tutorial

1. Create EKS Cluster Using eksctl

  • Create EKS cluster
eksctl create cluster -f eks.yaml
  • Verify that you can connect to the cluster
kubectl get svc

2. Deploy Metrics server (YAML)

  • List api services
kubectl get apiservice
  • Use grep and filter by metrics
kubectl get apiservice | grep metrics
  • Use kubectl to get metrics
kubectl top pods -n kube-system
  • Access metrics API
kubectl get --raw /apis/metrics.k8s.io/v1beta1 | jq

  • Create deployemnt files under 0-metrics-server directory

    • 0-service-account.yaml
    • 1-cluster-roles.yaml
    • 2-role-binding.yaml
    • 3-cluster-role-bindings.yaml
    • 4-service.yaml
    • 5-deployment.yaml
    • 6-api-service.yaml

  • Apply created filies

kubectl apply -f 0-metrics-server
  • Verify deployment
kubectl get pods -n kube-system
  • List api services
kubectl get apiservice
  • List services in kube-system namespace
kubectl get svc -n kube-system
  • Access metrics API
kubectl get --raw /apis/metrics.k8s.io/v1beta1 | jq
  • Get metrics for pods using raw command\
kubectl get --raw /apis/metrics.k8s.io/v1beta1/pods | jq
  • Use kubectl to get metrics
kubectl top pods -n kube-system

3. Deploy Metrics server (HELM)

  • Find default values for metrics-server chart
  • Create values.yaml file
  • Add bitnami helm repo
helm repo add bitnami https://charts.bitnami.com/bitnami
  • Search for metrics-server
helm search repo metrics-server --max-col-width 23
  • Install metrics-server Helm Chart
helm install metrics bitnami/metrics-server \
--namespace kube-system \
--version 5.8.13 \
--values values.yaml

3. Install Vertical Pod Autoscaler

  • Open Autoscaler GitHub page

  • Clone VPA repo

git clone https://github.com/kubernetes/autoscaler.git
  • Change directory
cd autoscaler/vertical-pod-autoscaler
  • Preview installation
./hack/vpa-process-yamls.sh print
  • Install VPA
./hack/vpa-up.sh
  • Tear down VPA
./hack/vpa-down.sh

4. Upgrade LibreSSL on Mac/OS X

  • Get OpenSSL version
openssl version
  • Upgrade LibreSSL with Homebew
brew install libressl
  • Get OpenSSL version
openssl version
  • Check instalation path of OpenSSL
which openssl
  • Check version of the LibreSSL installed with Homebew
/opt/homebrew/opt/libressl/bin/openssl version
  • Try to create a soft link
sudo ln -s /opt/homebrew/opt/libressl/bin/openssl /usr/bin/openssl
  • Try to rename openssl
sudo mv /usr/bin/openssl /usr/bin/openssl-old
  • Create soft link to /usr/local/bin/ which should take precedence on your path over /usr/bin.
sudo ln -s /opt/homebrew/opt/libressl/bin/openssl /usr/local/bin/openssl
  • Open new tab and run version command
openssl version

5. Install Vertical Pod Autoscaler (Continue)

  • Open new tab and change directory
cd Developer/autoscaler/vertical-pod-autoscaler
  • Install VPA
./hack/vpa-up.sh

6. Demo

  • Create deployment files under 1-demo directory

  • 0-deployment.yaml

  • 1-vpa.yaml

  • Open two tabs

watch -n 1 -t kubectl top pods
  • Deploy sample app
kubectl apply -f 1-demo
  • Let's run 5-10 min and in a new tab get VPA
kubectl get vpa
  • Describe VPA
kubectl describe vpa hamster-vpa
  • Update deployment and reapply
kubectl apply -f 1-demo/0-deployment.yaml

Clean Up

  • Delete EKS cluster
eksctl delete cluster -f eks.yaml
sudo rm /usr/local/bin/openssl
brew remove libressl
helm repo remove bitnami
rm -rf Developer/autoscaler