Deployment Basics

10 examples to get you started with Deploy & K8s - 7 basic and 3 intermediate.

Prerequisites

• Install Go 1.26.x or later from go.dev/dl.
• Install Docker for image builds and a local Kubernetes cluster (kind, minikube, or Docker Desktop Kubernetes).
• Install kubectl and verify cluster access: kubectl cluster-info.
• Create a module: mkdir deploylab && cd deploylab && go mod init example.com/deploylab.

Basic Examples

1. Release Binary with go build

Produce an optimized Linux binary from your module root.

CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -trimpath \
  -ldflags="-s -w" -o bin/api ./cmd/api

• CGO_ENABLED=0 yields a static binary suitable for scratch/distroless images.
• -trimpath removes local filesystem paths from binaries for reproducible builds.
• -ldflags="-s -w" strips debug symbols to shrink artifact size.

Related: Deploying Go: Single Binary as a Superpower - why one file changes ops

2. Embed Version Metadata at Build Time

Stamp git version into the binary for production debugging.

package main
 
import "fmt"
 
var (
    version = "dev"
    commit  = "none"
)
 
func main() {
    fmt.Printf("api %s (%s)\n", version, commit)
}

go build -ldflags="-X main.version=1.2.3 -X main.commit=$(git rev-parse --short HEAD)" -o bin/api .

• -X sets string variables in main at link time.
• Log version at startup so incidents map to CI build numbers.
• Keep unstripped debug builds in artifact storage for symbolication.

Related: CI/CD Pipelines for Go Services - automate version stamping in CI

3. Minimal HTTP Server for Containers

Bind to PORT from the environment, the default pattern for PaaS and Kubernetes.

package main
 
import (
    "fmt"
    "log"
    "net/http"
    "os"
)
 
func main() {
    port := os.Getenv("PORT")
    if port == "" {
        port = "8080"
    }
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintln(w, "hello")
    })
    log.Fatal(http.ListenAndServe(":"+port, nil))
}

• Containers should listen on all interfaces (:8080), not 127.0.0.1.
• Read PORT from env so platforms can assign ephemeral ports.
• Add explicit timeouts before production; defaults are unsafe behind load balancers.

Related: Multi-Stage Docker Builds for Go - package this server in a minimal image

4. Liveness-Ready Health Endpoint

Expose a cheap endpoint Kubernetes probes can call.

http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusOK)
    w.Write([]byte("ok"))
})

• Liveness should answer "is the process up?" without hitting databases.
• Readiness may check dependencies; keep it fast to avoid flapping during rollouts.
• Return non-200 when the process should stop receiving traffic.

Related: Probes, HPA & Pod Disruption Budgets - probe tuning and autoscaling

5. Single-Stage Dockerfile (Learning Path)

A simple two-line runtime image for local experiments.

FROM golang:1.26-bookworm AS build
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 go build -o /api ./cmd/api
 
FROM debian:bookworm-slim
COPY --from=build /api /api
EXPOSE 8080
ENTRYPOINT ["/api"]

• Multi-stage keeps compile tools out of the runtime layer.
• Even learning Dockerfiles should set CGO_ENABLED=0 for portable Linux binaries.
• Production teams move to distroless; this debian-slim stage is easier to debug locally.

Related: Multi-Stage Docker Builds for Go - distroless and CA certificates

6. Build and Run the Image Locally

Tag with a semver or git SHA, never only latest in shared environments.

docker build -t deploylab/api:0.1.0 .
docker run --rm -p 8080:8080 -e PORT=8080 deploylab/api:0.1.0
curl -s localhost:8080/healthz

• Immutable tags tie running containers to CI artifacts.
• Map host port 8080 to container PORT for quick smoke tests.
• Push the same tag your Kubernetes manifest references.

Related: Deployment Best Practices - semver tags and rollback discipline

7. Minimal Kubernetes Deployment

Run one replica with resource requests so the scheduler can place the pod.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: api
spec:
  replicas: 1
  selector:
    matchLabels:
      app: api
  template:
    metadata:
      labels:
        app: api
    spec:
      containers:
        - name: api
          image: deploylab/api:0.1.0
          ports:
            - containerPort: 8080
          env:
            - name: PORT
              value: "8080"
          resources:
            requests:
              cpu: 100m
              memory: 64Mi
            limits:
              memory: 128Mi

kubectl apply -f deployment.yaml
kubectl rollout status deployment/api

• resources.requests help the scheduler and HPA baselines.
• Pin image to a specific tag or digest, not a floating latest.
• Watch rollout status before declaring the deploy complete.

Related: Kubernetes Deployments, Services & Ingress - Services, Ingress, and limits

Intermediate Examples

8. ClusterIP Service and Port Forward

Expose the Deployment inside the cluster and test without Ingress.

apiVersion: v1
kind: Service
metadata:
  name: api
spec:
  selector:
    app: api
  ports:
    - port: 80
      targetPort: 8080

kubectl apply -f service.yaml
kubectl port-forward svc/api 8080:80
curl -s localhost:8080/healthz

• Services route stable DNS (api.default.svc.cluster.local) to pod IPs.
• targetPort must match the container listen port.
• Port-forward is for dev; production uses Ingress or LoadBalancer Services.

Related: Kubernetes Deployments, Services & Ingress - Ingress rules and TLS

9. HTTP Probes on the Deployment

Wire liveness and readiness probes to /healthz.

livenessProbe:
  httpGet:
    path: /healthz
    port: 8080
  initialDelaySeconds: 3
  periodSeconds: 10
readinessProbe:
  httpGet:
    path: /healthz
    port: 8080
  periodSeconds: 5

• initialDelaySeconds avoids killing pods still binding ports.
• Readiness failure removes the pod from Service endpoints during startup.
• Tune periodSeconds and timeoutSeconds to your SLO and cold-start time.

Related: Probes, HPA & Pod Disruption Budgets - PDBs and autoscaling

10. Graceful Shutdown on SIGTERM

Kubernetes sends SIGTERM before SIGKILL; drain in-flight requests.

package main
 
import (
    "context"
    "log"
    "net/http"
    "os"
    "os/signal"
    "syscall"
    "time"
)
 
func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("ok"))
    })
    srv := &http.Server{Addr: ":8080", Handler: mux}
 
    go func() {
        if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
            log.Fatal(err)
        }
    }()
 
    stop := make(chan os.Signal, 1)
    signal.Notify(stop, syscall.SIGTERM, syscall.SIGINT)
    <-stop
 
    ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
    defer cancel()
    if err := srv.Shutdown(ctx); err != nil {
        log.Fatal(err)
    }
}

• Shutdown stops accepting new connections and waits for active requests.
• Match termination grace period in the pod spec to your shutdown timeout.
• During rollouts, readiness failure plus graceful drain prevents dropped requests.

Related: Chaos Engineering Hooks for Go Microservices - validate behavior under failure

Stack versions: This page was written for Go 1.26.x (Green Tea GC default, go fix modernizers - verify patch at build), chi (latest - verify at build), gin (latest - verify at build), echo (latest - verify at build), google.golang.org/grpc (latest - verify at build), sigs.k8s.io/controller-runtime (latest - verify at build), kubebuilder (latest - verify at build), tinygo (latest - verify board targets at build), wazero (latest - verify at build), and golangci-lint (latest - verify linter set at build).

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