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run-aspnet-core-app-in-kubernetes

Sample to run AspNet Core application in Kubenetes. The sample uses kubernetes cluster installed by Docker Desktop on the local machine.

Application is accessible from host machine via a NodePort Service definition. In a production, an Ingress controller would be helpfull to serve your application to outside of the cluster. You should consider that, a load balancer is also required to configure a appropriate environment. Those consepts are out of scope for this sample.

For this sample, an image registry also required. Kubernetes needs to pull application images from an image registry to create the container and place it in a Pod. Indeed, we could use docker's public hub to pull a sample AspNetCore image. We want to make you more familier with what an image registry is. So we create a sample "private image resitry" in the docker.

Stpes to run an AspNet Core app in kubernetes.

Install Docker Desktop And Kubernetes on Docker

https://birthday.play-with-docker.com/kubernetes-docker-desktop/

Open docker desktop dashboard and goo settings. Enter insecure resgistry like below. As a default behaviour kubernetes try to pull images from secure endpoints and uses https. Since we use a quick private registry, we don't have any https endpoint. Use your ipv4 address instead of 192.168.56.1.

{
  "registry-mirrors": [],
  "insecure-registries": [
    "192.168.56.1:5005"
  ],
  "debug": true,
  "experimental": false
}

Create New AspNet Core App

git clone https://github.com/sedat-eyuboglu/run-aspnet-core-app-in-kubernetes.git

Publish AspNet App

dotnet publish -c Release -o publish

Build Docker Image

docker build -t sampleapp .
docker tag sampleapp localhost:5005/sampleapp

Run a Private Container Registry Localy

docker run -d -p 5005:5000 --restart always --name registry registry:2

Push Image to Local Repository

docker push localhost:5005/sampleapp

Create Kubernetes Components

Create deployment and service components.

Deployment

deployment/deployment.yaml

Service

deployment/service.yaml

Service assigns a random port number to our service. To find out port number used, run following kubectl command and look for sampleapp service. You should see a port number greater than 30000 in the PORT(S) field. After geting port number, open your browser and go to localhost:port.

kubectl get service