How to Write Kubernetes Manifests for a Go Service

Create a deployment.yaml manifest that defines the Go service container, image, and resource limits, then apply it to your cluster.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: go-service
spec:
  replicas: 1
  selector:
    matchLabels:
      app: go-service
  template:
    metadata:
      labels:
        app: go-service
    spec:
      containers:
      - name: go-service
        image: my-registry/go-service:latest
        ports:
        - containerPort: 8080
        resources:
          limits:
            cpu: "500m"
            memory: "128Mi"
          requests:
            cpu: "250m"
            memory: "64Mi"

Apply the manifest with:

kubectl apply -f deployment.yaml

Create a service.yaml manifest to expose the deployment:

apiVersion: v1
kind: Service
metadata:
  name: go-service
spec:
  selector:
    app: go-service
  ports:
  - protocol: TCP
    port: 80
    targetPort: 8080
  type: ClusterIP

Apply the service manifest:

kubectl apply -f service.yaml

You write a YAML file that tells Kubernetes how to run your Go program, including which image to use and how much memory it needs. You then use the kubectl command to send this file to your cluster, which starts the program and makes it accessible to other services. Think of it like a recipe card you hand to a chef (Kubernetes) so they know exactly how to cook your dish (your Go service).