Clone BrainUpgrade Kubernetes repo

git clone https://github.com/brainupgrade-in/kubernetes

Launch virtual machines using vagrant including kubernetes cluster setup using kubeadm

cd scalability/wordpress

vagrant up

Login into Kubernetes control plane

vagrant ssh master

Install metrics server using Helm

Install helm

curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash

Add bitnami repo and install metrics server

helm repo add bitnami https://charts.bitnami.com/bitnami

helm install metrics bitnami/metrics-server

helm upgrade --namespace default metrics bitnami/metrics-server --set apiService.create=true

kubectl get --raw "/apis/metrics.k8s.io/v1beta1/nodes"

Update metrics server to run in local kubeadm cluster

Metrics kubectl edit deploy metrics-metrics-server command: - metrics-server - --kubelet-insecure-tls - --kubelet-preferred-address-types=InternalIP

Deploy wordpress app

kubectl apply -k .

Define resources

kubectl set resources deploy wordpress --requests=cpu=50m,memory=100Mi –limits=cpu=200m,memory=300Mi

Enable Horizontal scaling

kubectl autoscale --min 1 --max 5 deploy wordpress --cpu-percent 50

Apache Bench

If using ubuntu as host os, then use below command else download from Apache bench site sudo apt-get install apache2-utils

Troubleshooting

Coredns

If wordpress is unable to connect to the database, then restart coredns deployment

kubectl rollout restart deploy coredns -n kube-system