Codestellar

# how to autoscale

  1. Get nodepools: (Resource Group: <resource_group_name>, Cluster: <cluster_name> )
az aks nodepool list --resource-group <resource_group_name> --cluster-name <cluster_name> -o table
  1. Enable Autoscale
az aks nodepool update \
  --resource-group <resource_group_name> \
  --cluster-name <cluster_name> \
  --name <node_pool_name> \
  --enable-cluster-autoscaler \
  --min-count 2 \
  --max-count 6
  1. Verify Autoscaling is enabled
az aks nodepool show \
  --resource-group <resource_group_name> \
  --cluster-name <cluster_name> \
  --name <node_pool_name> \
  --query "enableAutoScaling"
  1. Enable Horizontal pod scaling (HPA: horizonal pod autoscaler)
kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
  1. Increase Metrics Server Memory (Run if getting error in Step 4)
kubectl patch deployment metrics-server -n kube-system \
  --type='json' \
  -p='[
    {"op": "replace", "path": "/spec/template/spec/containers/0/resources/limits/memory", "value":"256Mi"},
    {"op": "replace", "path": "/spec/template/spec/containers/0/resources/requests/memory", "value":"200Mi"}
  ]'
  1. Rollout restart metrics server
kubectl rollout status deployment metrics-server -n kube-system
  1. Ensure that metrics server is running
kubectl get pods -n kube-system -l k8s-app=metrics-server
  1. Verify Metrics Server memory
kubectl get deployment metrics-server -n kube-system -o jsonpath="{.spec.template.spec.containers[0].resources}"
  1. Create HPA for your deployment
kubectl autoscale deployment <application_deployment_name> \
  --cpu-percent=50 \
  --min=2 \
  --max=10
  1. Check and verify hpa
kubectl delete hpa <hpa-name>

How to install Cert Manager?

helm repo add jetstack https://charts.jetstack.io
helm repo update

### Install cert-manager in its own namespace

helm install cert-manager jetstack/cert-manager \
  --namespace default \
  --version v1.15.1