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k8s.md

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Prerequisites of Kubernetes

  • Install Docker (Already Installed on Lab VM)
  • Install Kind on Lab VM
curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.18.0/kind-linux-amd64
chmod +x ./kind
sudo mv ./kind /bin
  • Install Kubectl on Lab vm (Already Installed)
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
chmod +x kubectl
sudo mv  kubectl /bin
  • Install Kubernetes cluster
kind create cluster --name <kubernetes cluster>
  • Now create a pod using below command
kubectl run myapp --image=nginx
  • How to Create svc
kubectl expose pod myapp --port=80
  • Create a deployment
kubectl create deployment myapp1 --image=nginx
  • Create svc for above deployment
kubectl expose deployment/myapp1 --port=80
  • Access your svc using port forward
kubectl port-forward  <svc/pod/deployment/rs>  <hostport:appport>
  • How to Access app
localhost:hostpaort

Integration Kubernetes and jenkins

  • Copy .kube file to /var/lib/jenkins
 cp .kube/  /var/lib/jenkins/ -rvf
  • Add permission so that jenkins users can execute command
chown jenkins /var/lib/jenkins/.kube/ -R

Now you should be able to execute any kubectl command from jenkins

Frequently used kubernets commands

https://kubernetes.io/docs/reference/kubectl/cheatsheet/
  • Check no of nodes attached
kubectl get nodes
  • To check no of pods
kubectl get pods
  • To check no of deployment
kubectl get deploy
  • How to check no of SVC
kubectl get svc

Optional and Additional

  • Create one deploy
kubectl create deployment myapp1 --image=nginx
  • Create svc
kubectl expose deployment/myapp1 --port=80

  • Update your deployment

     kubectl set image deployment myapp1 nginx=httpd

  • Check your app

    kubectl port-forward deployment/myapp1 81:80

  • Rollback your Application

    kubectl rollout undo deploy/myapp1

  • Verify once

    kubectl port-forward deployment/myapp1 81:80