#December20

Build:

• Gradle build gradlew clean build

• Build docker image docker build -f Dockerfile -t rohitanand650/demo .

• Login and push docker image to dockerhub, after you have created an account there and have a repository.

  docker login docker push rohitanand650/demo

Running docker

• Command line docker run -p 8080:8080 rohitanand650/demo

• Docker-compose

docker-compose up -d // start, -d is for detached mode in background docker-compose down // stop

Deploying demo app to kubernetes

Deployment

 `cd kubernetes`
 `kubectl apply -f demo_deployment.yaml`

Test API endpoint

• Endpoint <host>:<port>/hello

• Access pod without service - port forwarding Refer this

  Syntax: kubectl port-forward POD_NAME HOST_PORT:POD_PORT

  e.g. kubectl port-forward demo-app-deployment-649565d868-h576h 8081:8080

• Access service - NodePort

  Create service kubectl apply -f demo_service.yaml

  <minikube-ip>:nodePort doesn't work. Check this

  Run minikube service demo-app-service --url

  This will print the exposed host:port e.g. http://127.0.0.1:50905

  Try endpoint http://127.0.0.1:50905/hello

Minikube

• Start Minikube minikube start

• Start Minikube dashboard minikube dashboard

  Running this will automatically open the dashboard URL in browser. URL would also be displayed on the command line terminal.

Set minikube limits

• Let's say we would like to set it to use 6 CPU and 8 GB memory

  minikube config set cpus

  minikube config set memory 6000

  To apply above config:

  minikube delete

  minikube start

• Minikube memory issues

  Check this

  And, also check this

kubectl

• Get nodes kubectl get nodes

• Get pods

  kubectl get pods

  More details kubectl get pods -o wide

• Get deployments

  kubectl get deployments

• Get service

  kubectl get svc

• Get everything kubectl get all

• Delete pods/deployments/services

  kubectl delete pods <pod_name>

  kubectl delete deployments <deployment_name>

  kubectl delete svc <svc_name>

  Delete all pods kubectl delete --all pods

##Prometheus

• Spring Boot Micrometer