wip: oci

example/redis-cache/k8s/discovery-test.yaml

@@ -0,0 +1,105 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: k8s-discovery-test
+  namespace: redis-demo
+spec:
+  containers:
+  - name: test
+    image: alpine:latest
+    command: ["sh", "-c"]
+    args:
+    - |
+      echo "=== Installing Go ==="
+      apk add --no-cache go
+      
+      echo "=== Building discovery tool ==="
+      mkdir -p /app/discovery
+      cat > /app/discovery/main.go << 'EOF'
+package main
+
+import (
+	"fmt"
+	"net"
+	"strings"
+)
+
+func main() {
+	fmt.Println("=== Kubernetes Service Discovery Test ===")
+	
+	headlessAddr := "redis-headless.redis-demo.svc.cluster.local"
+	fmt.Printf("🔍 Discovering service: %s\n", headlessAddr)
+	
+	serviceInfo, err := parseHeadlessServiceAddr(headlessAddr)
+	if err != nil {
+		fmt.Printf("❌ Failed to discover service: %v\n", err)
+		return
+	}
+	
+	fmt.Println("\n📋 Service Information:")
+	fmt.Printf("  Name: %s\n", serviceInfo.Name)
+	fmt.Printf("  Namespace: %s\n", serviceInfo.Namespace)
+	
+	if len(serviceInfo.All) > 0 {
+		fmt.Printf("\n🌐 All Pod IPs (%d):\n", len(serviceInfo.All))
+		for idx, ip := range serviceInfo.All {
+			podName := fmt.Sprintf("%s-%d", serviceInfo.Name, idx)
+			if idx == 0 {
+				fmt.Printf("  📌 Master:  %s -> %s\n", podName, ip)
+			} else {
+				fmt.Printf("  📊 Replica: %s -> %s\n", podName, ip)
+			}
+		}
+	}
+	
+	fmt.Println("\n🎉 Service discovery completed successfully!")
+}
+
+type ServiceInfo struct {
+	Name  string
+	All   []string
+}
+
+func parseHeadlessServiceAddr(headlessAddr string) (*ServiceInfo, error) {
+	resolver := &net.Resolver{PreferGo: true}
+	addrs, err := resolver.LookupIPAddr(headlessAddr)
+	if err != nil {
+		return nil, fmt.Errorf("DNS query failed: %v", err)
+	}
+	
+	if len(addrs) == 0 {
+		return nil, fmt.Errorf("no records found")
+	}
+	
+	var podIPs []string
+	for _, addr := range addrs {
+		podIPs = append(podIPs, addr.String())
+	}
+	
+	parts := strings.Split(headlessAddr, ".")
+	if len(parts) < 4 {
+		return nil, fmt.Errorf("invalid format")
+	}
+	
+	serviceName := parts[0]
+	namespace := parts[1]
+	
+	return &ServiceInfo{
+		Name: serviceName,
+		All:  podIPs,
+	}, nil
+}
+EOF
+      
+      echo "=== Running discovery tool ==="
+      cd /app/discovery && go run main.go
+      
+      echo "=== Sleeping for 30s ==="
+      sleep 30
+    volumeMounts:
+    - name: app-volume
+      mountPath: /app
+  volumes:
+  - name: app-volume
+    emptyDir: {}
+  restartPolicy: Never