feat: add startup logging with network IPs and container detection

common/utils.go

@@ -68,6 +68,78 @@ func GetIp() (ip string) {
 	return
 }
 
+func GetNetworkIps() []string {
+	var networkIps []string
+	ips, err := net.InterfaceAddrs()
+	if err != nil {
+		log.Println(err)
+		return networkIps
+	}
+
+	for _, a := range ips {
+		if ipNet, ok := a.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
+			if ipNet.IP.To4() != nil {
+				ip := ipNet.IP.String()
+				// Include common private network ranges
+				if strings.HasPrefix(ip, "10.") ||
+					strings.HasPrefix(ip, "172.") ||
+					strings.HasPrefix(ip, "192.168.") {
+					networkIps = append(networkIps, ip)
+				}
+			}
+		}
+	}
+	return networkIps
+}
+
+// IsRunningInContainer detects if the application is running inside a container
+func IsRunningInContainer() bool {
+	// Method 1: Check for .dockerenv file (Docker containers)
+	if _, err := os.Stat("/.dockerenv"); err == nil {
+		return true
+	}
+
+	// Method 2: Check cgroup for container indicators
+	if data, err := os.ReadFile("/proc/1/cgroup"); err == nil {
+		content := string(data)
+		if strings.Contains(content, "docker") ||
+			strings.Contains(content, "containerd") ||
+			strings.Contains(content, "kubepods") ||
+			strings.Contains(content, "/lxc/") {
+			return true
+		}
+	}
+
+	// Method 3: Check environment variables commonly set by container runtimes
+	containerEnvVars := []string{
+		"KUBERNETES_SERVICE_HOST",
+		"DOCKER_CONTAINER",
+		"container",
+	}
+
+	for _, envVar := range containerEnvVars {
+		if os.Getenv(envVar) != "" {
+			return true
+		}
+	}
+
+	// Method 4: Check if init process is not the traditional init
+	if data, err := os.ReadFile("/proc/1/comm"); err == nil {
+		comm := strings.TrimSpace(string(data))
+		// In containers, process 1 is often not "init" or "systemd"
+		if comm != "init" && comm != "systemd" {
+			// Additional check: if it's a common container entrypoint
+			if strings.Contains(comm, "docker") ||
+				strings.Contains(comm, "containerd") ||
+				strings.Contains(comm, "runc") {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
 var sizeKB = 1024
 var sizeMB = sizeKB * 1024
 var sizeGB = sizeMB * 1024