fix: installer URL overridable, simplified deploy form

- WALLARM_INSTALLER_URL env var overrides the native node installer URL
- Address simplified: default IP 0.0.0.0, only ask for port
- Added upstream IP/port prompts
- Per-instance .env file saved to /opt/wallarm/{name}/.env
  (allows resuming/reinstalling from saved state)
- Confirmation summary before deploying

cmd/wallarm/main.go

@@ -14,6 +14,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"strconv"
 	"strings"
 	"time"
 
@@ -82,11 +83,26 @@ func runDeployFlow(r preflight.Result) {
 		return
 	}
 
-	fmt.Print("Listen address [0.0.0.0:8081]: ")
-	address, _ := reader.ReadString('\n')
-	address = strings.TrimSpace(address)
-	if address == "" {
-		address = "0.0.0.0:8081"
+	fmt.Print("Listen port [8081]: ")
+	port, _ := reader.ReadString('\n')
+	port = strings.TrimSpace(port)
+	if port == "" {
+		port = "8081"
+	}
+	address := "0.0.0.0:" + port
+
+	fmt.Print("Upstream IP [127.0.0.1]: ")
+	upstreamIP, _ := reader.ReadString('\n')
+	upstreamIP = strings.TrimSpace(upstreamIP)
+	if upstreamIP == "" {
+		upstreamIP = "127.0.0.1"
+	}
+
+	fmt.Print("Upstream port [80]: ")
+	upstreamPort, _ := reader.ReadString('\n')
+	upstreamPort = strings.TrimSpace(upstreamPort)
+	if upstreamPort == "" {
+		upstreamPort = "80"
 	}
 
 	fmt.Print("Labels [group=" + nodeName + "]: ")
@@ -96,10 +112,29 @@ func runDeployFlow(r preflight.Result) {
 		labels = "group=" + nodeName
 	}
 
+	fmt.Println()
+	fmt.Printf("  Node:       %s\n", nodeName)
+	fmt.Printf("  Listen:     %s\n", address)
+	fmt.Printf("  Upstream:   %s:%s\n", upstreamIP, upstreamPort)
+	fmt.Printf("  Region:     %s (%s)\n", s.CloudRegion, s.APIHost)
+	fmt.Print("\nProceed with deployment? [Y/n]: ")
+	confirm, _ := reader.ReadString('\n')
+	confirm = strings.TrimSpace(strings.ToLower(confirm))
+	if confirm != "" && confirm != "y" && confirm != "yes" {
+		fmt.Println("Cancelled.")
+		return
+	}
+
+	baseDir := "/opt/wallarm"
+	instanceDir := baseDir + "/" + nodeName
+
+	portNum, _ := strconv.Atoi(upstreamPort)
 	s.Nodes = append(s.Nodes, state.Node{
 		Name:         nodeName,
 		Type:         "native",
 		Address:      address,
+		UpstreamIP:   upstreamIP,
+		UpstreamPort: portNum,
 		Status:       "deploying",
 		CreatedAt:    time.Now().Format(time.RFC3339),
 	})
@@ -108,6 +143,20 @@ func runDeployFlow(r preflight.Result) {
 	fmt.Println()
 	fmt.Println("Starting deployment...")
 
+	// Create instance directory and .env file
+	os.MkdirAll(instanceDir+"/etc", 0755)
+	os.MkdirAll(instanceDir+"/var/log", 0755)
+	os.MkdirAll(instanceDir+"/var/run", 0755)
+
+	envContent := fmt.Sprintf(`WALLARM_API_TOKEN=%s
+WALLARM_API_HOST=%s
+WALLARM_LABELS=%s
+WALLARM_LISTEN=%s
+WALLARM_UPSTREAM=%s:%s
+WALLARM_REGION=%s
+`, s.APIToken, s.APIHost, labels, address, upstreamIP, upstreamPort, s.CloudRegion)
+	os.WriteFile(instanceDir+"/.env", []byte(envContent), 0600)
+
 	if err := native.CreateNodesDir(); err != nil {
 		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 		return

internal/native/native.go

@@ -59,9 +59,13 @@ connector:
 	}
 
 	// 3. Download installer if missing
+	installerURL := InstallerURL
+	if u := os.Getenv("WALLARM_INSTALLER_URL"); u != "" {
+		installerURL = u
+	}
 	if _, err := os.Stat(installerPath); os.IsNotExist(err) {
 		fmt.Printf("[%s] Downloading installer...\n", node.Name)
-		cmd := exec.Command("curl", "-fsSL", "-o", installerPath, InstallerURL)
+		cmd := exec.Command("curl", "-fsSL", "-o", installerPath, installerURL)
 		if out, err := cmd.CombinedOutput(); err != nil {
 			return fmt.Errorf("download installer: %w\n%s", err, string(out))
 		}