/node-hello-world

Primary LanguageSmarty

node-hello-world with docker, kubernetes, helm deployment

Nodejs, Docker, Kubernetes, Helm, Ubuntu Server

Docker Image

  • Docker image node-hello-world
  • Pull the image docker pull imtiazmasrur/node-hello-world

Docker Authorization on Kubernetes

  • Authorize your Docker account DockerHub kubectl create secret docker-registry regcred --docker-username=<your-name> --docker-password=<your-pword> --docker-email=<your-email> -n <your-namespace>

Create Namespace on Kubernetes

  • Create a namespace kubectl create namespace developers-space
  • OR
  • Run kubectl apply -f namespace.yml
  • To see all namespace kubectl get namespace | kubectl get ns

Create Secret on Kubernetes

  • N.B. - Secret must be created before Deployment
  • To create base64 password echo -n 'password' | base64 // Output: bXlfZGF0YWJhc2U=
  • To apply secret kubectl apply -f secret.yaml
  • To apply secret to specific namespace kubectl apply -f secret.yaml --namespace=developers-space
  • Get secret kubectl get secret -n developers-space
  • Get secret details kubectl describe secret node-hello-world-secret -n developers-space
  • Edit secret kubectl edit secret node-hello-world-secret -n developers-space
  • Delete secret kubectl delete secret node-hello-world-secret -n developers-space

Create Deployment/Pod on Kubernetes

  • To see default namespace (everything) kubectl get all
  • OR
  • To see all namespace (everything) kubectl get all -A
  • OR
  • To see all your named namespace (everything) kubectl get all -n developers-space
  • To see only deployment kubectl get deploy
  • To find anything kubectl get all -n developers-space | grep node-hello-world
  • After any update apply on deployment.yaml file kubectl apply -f deployment.yaml
  • Restart pod kubectl rollout restart deployment node-hello-world -n developers-space
  • Stop a single deployment/pod kubectl -n developers-space scale deployment node-hello-world --replicas 0
  • Delete a deployment kubectl delete deploy node-hello-world

Pod Debugging commands on Kubernetes

  • To see your namespace's pods kubectl get pods -n developers-space
  • Get pod details info of a pod (pod name - "node-hello-world-6f455d9c5c-758fs") kubectl describe pod node-hello-world-6f455d9c5c-758fs -n developers-space
  • To watch pod - kubectl get pod --watch -n developers-space
  • Further details of pods (Ex. - details with ip) - kubectl get pod -o wide -n developers-space
  • To see the logs/consoles of pod (pod name - "node-hello-world-6f455d9c5c-758fs") kubectl logs node-hello-world-6f455d9c5c-758fs -n developers-space
  • Enter pod console (pod name - "node-hello-world-6f455d9c5c-758fs") kubectl exec -it node-hello-world-6f455d9c5c-758fs -n developers-space sh
  • See all ENV of pod kubectl exec node-hello-world-6f455d9c5c-758fs -- env
  • See DB_USER ENV of pod kubectl exec node-hello-world-6f455d9c5c-758fs -- env | grep DB_USER

Deployment Debugging Commands on Kubernetes

  • Create deployment from DockerHub (image name - "nginx") kubectl create deployment nginx-deployment --image=nginx -n developers-space
  • Get all deployments kubectl get deployment -n developers-space
  • To edit deployments (deployment name - "node-hello-world") kubectl edit deployment node-hello-world -n developers-space
  • Delete deployment (deployment name - "node-hello-world") kubectl delete deployment node-hello-world -n developers-space
  • OR
  • Delete deployment with filename kubectl delete -f deployment.yaml -n developers-space
  • Get deployment details kubectl get deployment node-hello-world -o yaml -n developers-space
  • If you need the deployment details output to a file kubectl get deployment node-hello-world -o yaml -n developers-space > node-hello-world-deployment.yaml

Service Debugging Commands on Kubernetes

  • Get service info (service name - "node-hello-world") kubectl describe service node-hello-world -n developers-space
  • Get all services kubectl get svc
  • Open service on browser URL - minikube service node-hello-world -n developers-space
  • Get service URl - minikube service node-hello-world -n developers-space --url
  • Get all replicaset kubectl get replicaset -n developers-space | kubectl get rs
  • To delete service kubectl delete services node-hello-world

Some Commands on Kubernetes

  • Get the Cluster State/Information kubectl cluster-info
  • Get The Cluster Information kubectl config view
  • See all available API resources which are not attached to the namespace kubectl api-resources --namespaced=false
  • See all available API resources which are attached to the namespace kubectl api-resources --namespaced=true
  • Stop all deployments/pods kubectl -n developers-space scale deployment $(kubectl -n developers-space get deployment | awk '{print $1}') --replicas 0
  • To stop all Kubernetes stateful sets kubectl -n developers-space scale statefulset --replicas 0 $(kubectl -n developers-space get statefulset | awk '{print $1}')
  • Delete all from kubernetes kubectl delete all --all
  • Delete All Resources from namespace kubectl delete all --all -n developers-space
  • To see minikube dashboard minikube dashboard
  • To get minikube dashboard minikube dashboard --url
  • Delete cluster from list kubectl config delete-cluster clusterName
  • Delete context kubectl config delete-context contextName
  • Change context kubectl config set-context minikube

kubectx and kubens commands

  • Now we do not want to put namespace name each time to run namespace command.
  • So that we will install kubectx
  • To install sudo apt install kubectx
  • If not install in ubuntu try below commands
    • sudo git clone https://github.com/ahmetb/kubectx /usr/local/kubectx
    • sudo ln -s /usr/local/kubectx/kubectx /usr/local/bin/kubectx
    • sudo ln -s /usr/local/kubectx/kubens /usr/local/bin/kubens
    • sudo ln -s /usr/local/kubectx/completion/kubectx.zsh /usr/local/share/zsh/site-functions/_kubectx.zsh
    • sudo ln -s /usr/local/kubectx/completion/kubens.zsh /usr/local/share/zsh/site-functions/_kubens.zsh
  • To see all namespaces kubens
  • Switch to any namespace kubens developers-space

Ingress on Kubernetes

  • Enable Ingress on minikube minikube addons enable ingress
  • Check OR See, is ingress running kubectl get pod -n kube-system
  • kubectl apply -f ingress.yaml -n developers-space
  • See all ingress kubectl get ingress
  • See more details of ingress kubectl describe ingress node-server-ingress
  • You will see IP address of ingress
  • Run sudo nano /etc/hosts
  • Add line (not this IP wat you will see on your console) 192.168.49.2 nodehelloworld.com to your host file
  • Check ingress by yaml file kubectl get ingress node-server-ingress -o yaml

HELM

  • Check helm version helm version
  • Helm hub artifacthub.io
  • Create helm helm create node-hello-world-chart
  • Go to helm repo path cd deployments/node-hello-world-chart/
  • To install (Example command) - helm install <full name override> <chart name>/ --values <chart name>/values.yaml
  • Run this helm install node-hello-world ./ --values values.yaml
  • Upgrade/Update helm helm upgrade --install node-hello-world ./ --values values.yaml
  • List helm from all namespace helm list --all-namespaces
  • List all helm helm list
  • Helm uninstall (remove all helm resources) helm uninstall node-hello-world

References