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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