To run four application microservices as Docker containers within MicroK8s (a lightweight Kubernetes distribution), you'll need to follow several steps. Here's a basic guide to help you get started:

Step 1: Install MicroK8s

Ensure MicroK8s is installed on your machine. You can follow the official documentation for installation instructions: MicroK8s Installation

Step 2: Enable Necessary Add-ons

MicroK8s provides several add-ons that you may need for your setup. Enable the required ones by running:

bash microk8s enable dns dashboard ingress

Step 3: Build Docker Images

Build Docker images for your four microservices. Each microservice should have its Dockerfile. Move to the directory where your Dockerfile is located and run:

bash docker build -t .

Repeat this step for each microservice, giving each one a unique .

Step 4: Push Docker Images to a Container Registry (Optional)

If your MicroK8s cluster is not running on the same machine where you built the images, consider pushing them to a container registry [Either Docker Hub or Azure registry]. Popular choices include Docker Hub, Google Container Registry, or others.

bash docker login docker tag / docker push /

Step 5: Create Kubernetes Deployment YAML Files

For each microservice, create a Kubernetes Deployment YAML file. Below is an example for one microservice (example-deployment.yaml). Repeat this for each microservice, modifying the file accordingly.

yaml apiVersion: apps/v1 kind: Deployment metadata: name: microservice-1 spec: replicas: 1 selector: matchLabels: app: microservice-1 template: metadata: labels: app: microservice-1 spec: containers: - name: microservice-1 image: / ports: - containerPort: 80

Replace and with your container registry and image names.

Step 6: Apply Deployments

Apply the Deployment YAML files to your MicroK8s cluster:

bash microk8s kubectl apply -f example-deployment.yaml

Repeat this step for each microservice.

Step 7: Expose Microservices

Expose your microservices if needed. For example, if you want to expose them via Ingress, create an Ingress YAML file:

yaml apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: microservices-ingress spec: rules: - host: your-domain.com http: paths: - path: /microservice-1 pathType: Prefix backend: service: name: microservice-1 port: number: 80

Apply the Ingress:

bash microk8s kubectl apply -f ingress.yaml