Feature: extend advanced settings with more options & inherit app defaults (#9776)

docs/misc/build.func/BUILD_FUNC_ADVANCED_SETTINGS.md

@@ -0,0 +1,164 @@
+# Advanced Settings Wizard Reference
+
+## Overview
+
+The Advanced Settings wizard provides a 28-step interactive configuration for LXC container creation. It allows users to customize every aspect of the container while inheriting sensible defaults from the CT script.
+
+## Key Features
+
+- **Inherit App Defaults**: All `var_*` values from CT scripts pre-populate wizard fields
+- **Back Navigation**: Press Cancel/Back to return to previous step
+- **App Default Hints**: Each dialog shows `(App default: X)` to indicate script defaults
+- **Full Customization**: Every configurable option is accessible
+
+## Wizard Steps
+
+| Step | Title                    | Variable(s)                       | Description                                           |
+| ---- | ------------------------ | --------------------------------- | ----------------------------------------------------- |
+| 1    | Container Type           | `var_unprivileged`                | Privileged (0) or Unprivileged (1) container          |
+| 2    | Root Password            | `var_pw`                          | Set password or use automatic login                   |
+| 3    | Container ID             | `var_ctid`                        | Unique container ID (auto-suggested)                  |
+| 4    | Hostname                 | `var_hostname`                    | Container hostname                                    |
+| 5    | Disk Size                | `var_disk`                        | Disk size in GB                                       |
+| 6    | CPU Cores                | `var_cpu`                         | Number of CPU cores                                   |
+| 7    | RAM Size                 | `var_ram`                         | RAM size in MiB                                       |
+| 8    | Network Bridge           | `var_brg`                         | Network bridge (vmbr0, etc.)                          |
+| 9    | IPv4 Configuration       | `var_net`, `var_gateway`          | DHCP or static IP with gateway                        |
+| 10   | IPv6 Configuration       | `var_ipv6_method`                 | Auto, DHCP, Static, or None                           |
+| 11   | MTU Size                 | `var_mtu`                         | Network MTU (default: 1500)                           |
+| 12   | DNS Search Domain        | `var_searchdomain`                | DNS search domain                                     |
+| 13   | DNS Server               | `var_ns`                          | Custom DNS server IP                                  |
+| 14   | MAC Address              | `var_mac`                         | Custom MAC address (auto-generated if empty)          |
+| 15   | VLAN Tag                 | `var_vlan`                        | VLAN tag ID                                           |
+| 16   | Tags                     | `var_tags`                        | Container tags (comma/semicolon separated)            |
+| 17   | SSH Settings             | `var_ssh`                         | SSH key selection and root access                     |
+| 18   | FUSE Support             | `var_fuse`                        | Enable FUSE for rclone, mergerfs, AppImage            |
+| 19   | TUN/TAP Support          | `var_tun`                         | Enable for VPN apps (WireGuard, OpenVPN, Tailscale)   |
+| 20   | Nesting Support          | `var_nesting`                     | Enable for Docker, LXC in LXC, Podman                 |
+| 21   | GPU Passthrough          | `var_gpu`                         | Auto-detect and pass through Intel/AMD/NVIDIA GPUs    |
+| 22   | Keyctl Support           | `var_keyctl`                      | Enable for Docker, systemd-networkd                   |
+| 23   | APT Cacher Proxy         | `var_apt_cacher`, `var_apt_cacher_ip` | Use apt-cacher-ng for faster downloads            |
+| 24   | Container Timezone       | `var_timezone`                    | Set timezone (e.g., Europe/Berlin)                    |
+| 25   | Container Protection     | `var_protection`                  | Prevent accidental deletion                           |
+| 26   | Device Node Creation     | `var_mknod`                       | Allow mknod (experimental, kernel 5.3+)               |
+| 27   | Mount Filesystems        | `var_mount_fs`                    | Allow specific mounts: nfs, cifs, fuse, etc.          |
+| 28   | Verbose Mode & Confirm   | `var_verbose`                     | Enable verbose output + final confirmation            |
+
+## Default Value Inheritance
+
+The wizard inherits defaults from multiple sources:
+
+```text
+CT Script (var_*) → default.vars → app.vars → User Input
+```
+
+### Example: VPN Container (alpine-wireguard.sh)
+
+```bash
+# CT script sets:
+var_tun="${var_tun:-1}"  # TUN enabled by default
+
+# In Advanced Settings Step 19:
+# Dialog shows: "(App default: 1)" and pre-selects "Yes"
+```
+
+### Example: Media Server (jellyfin.sh)
+
+```bash
+# CT script sets:
+var_gpu="${var_gpu:-yes}"  # GPU enabled by default
+
+# In Advanced Settings Step 21:
+# Dialog shows: "(App default: yes)" and pre-selects "Yes"
+```
+
+## Feature Matrix
+
+| Feature           | Variable         | When to Enable                                      |
+| ----------------- | ---------------- | --------------------------------------------------- |
+| FUSE              | `var_fuse`       | rclone, mergerfs, AppImage, SSHFS                   |
+| TUN/TAP           | `var_tun`        | WireGuard, OpenVPN, Tailscale, VPN containers       |
+| Nesting           | `var_nesting`    | Docker, Podman, LXC-in-LXC, systemd-nspawn          |
+| GPU Passthrough   | `var_gpu`        | Plex, Jellyfin, Emby, Frigate, Ollama, ComfyUI      |
+| Keyctl            | `var_keyctl`     | Docker (unprivileged), systemd-networkd             |
+| Protection        | `var_protection` | Production containers, prevent accidental deletion  |
+| Mknod             | `var_mknod`      | Device node creation (experimental)                 |
+| Mount FS          | `var_mount_fs`   | NFS mounts, CIFS shares, custom filesystems         |
+| APT Cacher        | `var_apt_cacher` | Speed up downloads with local apt-cacher-ng         |
+
+## Confirmation Summary
+
+Step 28 displays a comprehensive summary before creation:
+
+```text
+Container Type: Unprivileged
+Container ID: 100
+Hostname: jellyfin
+
+Resources:
+  Disk: 8 GB
+  CPU: 2 cores
+  RAM: 2048 MiB
+
+Network:
+  Bridge: vmbr0
+  IPv4: dhcp
+  IPv6: auto
+
+Features:
+  FUSE: no | TUN: no
+  Nesting: Enabled | Keyctl: Disabled
+  GPU: yes | Protection: No
+
+Advanced:
+  Timezone: Europe/Berlin
+  APT Cacher: no
+  Verbose: no
+```
+
+## Usage Examples
+
+### Skip to Advanced Settings
+
+```bash
+# Run script, select "Advanced" from menu
+bash -c "$(curl -fsSL https://...jellyfin.sh)"
+# Then select option 3 "Advanced"
+```
+
+### Pre-set Defaults via Environment
+
+```bash
+# Set defaults before running
+export var_cpu=4
+export var_ram=4096
+export var_gpu=yes
+bash -c "$(curl -fsSL https://...jellyfin.sh)"
+# Advanced settings will inherit these values
+```
+
+### Non-Interactive with All Options
+
+```bash
+# Set all variables for fully automated deployment
+export var_unprivileged=1
+export var_cpu=2
+export var_ram=2048
+export var_disk=8
+export var_net=dhcp
+export var_fuse=no
+export var_tun=no
+export var_gpu=yes
+export var_nesting=1
+export var_protection=no
+export var_verbose=no
+bash -c "$(curl -fsSL https://...jellyfin.sh)"
+```
+
+## Notes
+
+- **Cancel at Step 1**: Exits the script entirely
+- **Cancel at Steps 2-28**: Goes back to previous step
+- **Empty fields**: Use default value
+- **Keyctl**: Automatically enabled for unprivileged containers
+- **Nesting**: Enabled by default (required for many apps)

docs/misc/build.func/BUILD_FUNC_ENVIRONMENT_VARIABLES.md

@@ -66,17 +66,36 @@ This document provides a comprehensive reference of all environment variables us
 
 ### Feature Flags
 
-| Variable              | Description                 | Default | Set In          | Used In            |
+| Variable         | Description                    | Default | Set In                          | Used In            |
-| --------------------- | --------------------------- | ------- | --------------- | ------------------ |
+| ---------------- | ------------------------------ | ------- | ------------------------------- | ------------------ |
-| `ENABLE_FUSE`         | Enable FUSE support         | "true"  | base_settings() | Container features |
+| `var_fuse`       | Enable FUSE support            | "no"    | CT script / Advanced Settings   | Container features |
-| `ENABLE_TUN`          | Enable TUN/TAP support      | "true"  | base_settings() | Container features |
+| `var_tun`        | Enable TUN/TAP support         | "no"    | CT script / Advanced Settings   | Container features |
-| `ENABLE_KEYCTL`       | Enable keyctl support       | "true"  | base_settings() | Container features |
+| `var_nesting`    | Enable nesting support         | "1"     | CT script / Advanced Settings   | Container features |
-| `ENABLE_MOUNT`        | Enable mount support        | "true"  | base_settings() | Container features |
+| `var_keyctl`     | Enable keyctl support          | "0"     | CT script / Advanced Settings   | Container features |
-| `ENABLE_NESTING`      | Enable nesting support      | "false" | base_settings() | Container features |
+| `var_mknod`      | Allow device node creation     | "0"     | CT script / Advanced Settings   | Container features |
-| `ENABLE_PRIVILEGED`   | Enable privileged mode      | "false" | base_settings() | Container features |
+| `var_mount_fs`   | Allowed filesystem mounts      | ""      | CT script / Advanced Settings   | Container features |
-| `ENABLE_UNPRIVILEGED` | Enable unprivileged mode    | "true"  | base_settings() | Container features |
+| `var_protection` | Enable container protection    | "no"    | CT script / Advanced Settings   | Container creation |
-| `VERBOSE`             | Enable verbose output       | "false" | Environment     | Logging            |
+| `var_timezone`   | Container timezone             | ""      | CT script / Advanced Settings   | Container creation |
-| `SSH`                 | Enable SSH key provisioning | "true"  | base_settings() | SSH setup          |
+| `var_verbose`    | Enable verbose output          | "no"    | Environment / Advanced Settings | Logging            |
+| `var_ssh`        | Enable SSH key provisioning    | "no"    | CT script / Advanced Settings   | SSH setup          |
+| `ENABLE_FUSE`    | FUSE flag (internal)           | "no"    | Advanced Settings               | Container creation |
+| `ENABLE_TUN`     | TUN/TAP flag (internal)        | "no"    | Advanced Settings               | Container creation |
+| `ENABLE_NESTING` | Nesting flag (internal)        | "1"     | Advanced Settings               | Container creation |
+| `ENABLE_KEYCTL`  | Keyctl flag (internal)         | "0"     | Advanced Settings               | Container creation |
+| `ENABLE_MKNOD`   | Mknod flag (internal)          | "0"     | Advanced Settings               | Container creation |
+| `PROTECT_CT`     | Protection flag (internal)     | "no"    | Advanced Settings               | Container creation |
+| `CT_TIMEZONE`    | Timezone setting (internal)    | ""      | Advanced Settings               | Container creation |
+| `VERBOSE`        | Verbose mode flag              | "no"    | Environment                     | Logging            |
+| `SSH`            | SSH access flag                | "no"    | Advanced Settings               | SSH setup          |
+
+### APT Cacher Configuration
+
+| Variable           | Description              | Default | Set In                        | Used In             |
+| ------------------ | ------------------------ | ------- | ----------------------------- | ------------------- |
+| `var_apt_cacher`   | Enable APT cacher proxy  | "no"    | CT script / Advanced Settings | Package management  |
+| `var_apt_cacher_ip`| APT cacher server IP     | ""      | CT script / Advanced Settings | Package management  |
+| `APT_CACHER`       | APT cacher flag          | "no"    | Advanced Settings             | Container creation  |
+| `APT_CACHER_IP`    | APT cacher IP (internal) | ""      | Advanced Settings             | Container creation  |
 
 ### GPU Passthrough Variables
 

docs/misc/build.func/README.md

@@ -6,6 +6,16 @@ This directory contains comprehensive documentation for the `build.func` script,
 
 ## Documentation Files
 
+### 🎛️ [BUILD_FUNC_ADVANCED_SETTINGS.md](./BUILD_FUNC_ADVANCED_SETTINGS.md)
+Complete reference for the 28-step Advanced Settings wizard, including all configurable options and their inheritance behavior.
+
+**Contents:**
+- All 28 wizard steps explained
+- Default value inheritance
+- Feature matrix (when to enable each feature)
+- Confirmation summary format
+- Usage examples
+
 ### 📊 [BUILD_FUNC_FLOWCHART.md](./BUILD_FUNC_FLOWCHART.md)
 Visual ASCII flowchart showing the main execution flow, decision trees, and key decision points in the build.func script.
 

misc/build.func

@@ -816,6 +816,7 @@ _build_current_app_vars_tmp() {
   _apt_cacher_ip="${APT_CACHER_IP:-}"
   _fuse="${ENABLE_FUSE:-no}"
   _tun="${ENABLE_TUN:-no}"
+  _gpu="${ENABLE_GPU:-no}"
   _nesting="${ENABLE_NESTING:-1}"
   _keyctl="${ENABLE_KEYCTL:-0}"
   _mknod="${ENABLE_MKNOD:-0}"
@@ -865,6 +866,7 @@ _build_current_app_vars_tmp() {
 
     [ -n "$_fuse" ] && echo "var_fuse=$(_sanitize_value "$_fuse")"
     [ -n "$_tun" ] && echo "var_tun=$(_sanitize_value "$_tun")"
+    [ -n "$_gpu" ] && echo "var_gpu=$(_sanitize_value "$_gpu")"
     [ -n "$_nesting" ] && echo "var_nesting=$(_sanitize_value "$_nesting")"
     [ -n "$_keyctl" ] && echo "var_keyctl=$(_sanitize_value "$_keyctl")"
     [ -n "$_mknod" ] && echo "var_mknod=$(_sanitize_value "$_mknod")"
@@ -1011,38 +1013,49 @@ advanced_settings() {
   # Initialize defaults
   TAGS="community-script;${var_tags:-}"
   local STEP=1
-  local MAX_STEP=20
+  local MAX_STEP=28
 
-  # Store values for back navigation
+  # Store values for back navigation - inherit from var_* app defaults
-  local _ct_type="${CT_TYPE:-1}"
+  local _ct_type="${var_unprivileged:-1}"
   local _pw=""
   local _pw_display="Automatic Login"
   local _ct_id="$NEXTID"
   local _hostname="$NSAPP"
-  local _disk_size="$var_disk"
+  local _disk_size="${var_disk:-4}"
-  local _core_count="$var_cpu"
+  local _core_count="${var_cpu:-1}"
-  local _ram_size="$var_ram"
+  local _ram_size="${var_ram:-1024}"
-  local _bridge="vmbr0"
+  local _bridge="${var_brg:-vmbr0}"
-  local _net="dhcp"
+  local _net="${var_net:-dhcp}"
-  local _gate=""
+  local _gate="${var_gateway:-}"
-  local _ipv6_method="auto"
+  local _ipv6_method="${var_ipv6_method:-auto}"
   local _ipv6_addr=""
   local _ipv6_gate=""
-  local _apt_cacher_ip=""
+  local _apt_cacher="${var_apt_cacher:-no}"
-  local _mtu=""
+  local _apt_cacher_ip="${var_apt_cacher_ip:-}"
-  local _sd=""
+  local _mtu="${var_mtu:-}"
-  local _ns=""
+  local _sd="${var_searchdomain:-}"
-  local _mac=""
+  local _ns="${var_ns:-}"
-  local _vlan=""
+  local _mac="${var_mac:-}"
+  local _vlan="${var_vlan:-}"
   local _tags="$TAGS"
-  local _enable_fuse="no"
+  local _enable_fuse="${var_fuse:-no}"
+  local _enable_tun="${var_tun:-no}"
   local _enable_gpu="${var_gpu:-no}"
-  local _verbose="no"
+  local _enable_nesting="${var_nesting:-1}"
-  local _enable_keyctl="0"
+  local _verbose="${var_verbose:-no}"
-  local _enable_mknod="0"
+  local _enable_keyctl="${var_keyctl:-0}"
-  local _mount_fs=""
+  local _enable_mknod="${var_mknod:-0}"
-  local _protect_ct="no"
+  local _mount_fs="${var_mount_fs:-}"
-  local _ct_timezone=""
+  local _protect_ct="${var_protection:-no}"
+  
+  # Detect host timezone for default (if not set via var_timezone)
+  local _host_timezone=""
+  if command -v timedatectl >/dev/null 2>&1; then
+    _host_timezone=$(timedatectl show --value --property=Timezone 2>/dev/null || echo "")
+  elif [ -f /etc/timezone ]; then
+    _host_timezone=$(cat /etc/timezone 2>/dev/null || echo "")
+  fi
+  local _ct_timezone="${var_timezone:-$_host_timezone}"
 
   # Helper to show current progress
   show_progress() {
@@ -1498,14 +1511,17 @@ advanced_settings() {
       ;;
 
     # ═══════════════════════════════════════════════════════════════════════════
-    # STEP 18: FUSE & Verbose Mode
+    # STEP 18: FUSE Support
     # ═══════════════════════════════════════════════════════════════════════════
     18)
+      local fuse_default_flag="--defaultno"
+      [[ "$_enable_fuse" == "yes" || "$_enable_fuse" == "1" ]] && fuse_default_flag=""
+
       if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
         --title "FUSE SUPPORT" \
         --ok-button "Next" --cancel-button "Back" \
-        --defaultno \
+        $fuse_default_flag \
-        --yesno "\nEnable FUSE support?\n\nRequired for: rclone, mergerfs, AppImage, etc." 12 58; then
+        --yesno "\nEnable FUSE support?\n\nRequired for: rclone, mergerfs, AppImage, etc.\n\n(App default: ${var_fuse:-no})" 14 58; then
         _enable_fuse="yes"
       else
         if [ $? -eq 1 ]; then
@@ -1515,30 +1531,69 @@ advanced_settings() {
           continue
         fi
       fi
+      ((STEP++))
+      ;;
+
+    # ═══════════════════════════════════════════════════════════════════════════
+    # STEP 19: TUN/TAP Support
+    # ═══════════════════════════════════════════════════════════════════════════
+    19)
+      local tun_default_flag="--defaultno"
+      [[ "$_enable_tun" == "yes" || "$_enable_tun" == "1" ]] && tun_default_flag=""
 
       if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
-        --title "VERBOSE MODE" \
+        --title "TUN/TAP SUPPORT" \
-        --defaultno \
+        --ok-button "Next" --cancel-button "Back" \
-        --yesno "\nEnable Verbose Mode?\n\nShows detailed output during installation." 12 58; then
+        $tun_default_flag \
-        _verbose="yes"
+        --yesno "\nEnable TUN/TAP device support?\n\nRequired for: VPN apps (WireGuard, OpenVPN, Tailscale),\nnetwork tunneling, and containerized networking.\n\n(App default: ${var_tun:-no})" 14 62; then
+        _enable_tun="yes"
       else
-        _verbose="no"
+        if [ $? -eq 1 ]; then
+          _enable_tun="no"
+        else
+          ((STEP--))
+          continue
+        fi
       fi
       ((STEP++))
       ;;
 
     # ═══════════════════════════════════════════════════════════════════════════
-    # STEP 19: GPU Passthrough
+    # STEP 20: Nesting Support
     # ═══════════════════════════════════════════════════════════════════════════
-    19)
+    20)
-      local gpu_default="OFF"
+      local nesting_default_flag=""
-      [[ "$_enable_gpu" == "yes" ]] && gpu_default="ON"
+      [[ "$_enable_nesting" == "0" || "$_enable_nesting" == "no" ]] && nesting_default_flag="--defaultno"
+
+      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+        --title "NESTING SUPPORT" \
+        --ok-button "Next" --cancel-button "Back" \
+        $nesting_default_flag \
+        --yesno "\nEnable Nesting?\n\nRequired for: Docker, LXC inside LXC, Podman,\nand other containerization tools.\n\n(App default: ${var_nesting:-1})" 14 58; then
+        _enable_nesting="1"
+      else
+        if [ $? -eq 1 ]; then
+          _enable_nesting="0"
+        else
+          ((STEP--))
+          continue
+        fi
+      fi
+      ((STEP++))
+      ;;
+
+    # ═══════════════════════════════════════════════════════════════════════════
+    # STEP 21: GPU Passthrough
+    # ═══════════════════════════════════════════════════════════════════════════
+    21)
+      local gpu_default_flag="--defaultno"
+      [[ "$_enable_gpu" == "yes" ]] && gpu_default_flag=""
 
       if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
         --title "GPU PASSTHROUGH" \
         --ok-button "Next" --cancel-button "Back" \
-        --defaultno \
+        $gpu_default_flag \
-        --yesno "\nEnable GPU Passthrough?\n\nAutomatically detects and passes through available GPUs\n(Intel/AMD/NVIDIA) for hardware acceleration.\n\nRecommended for: Media servers, AI/ML, Transcoding" 14 62; then
+        --yesno "\nEnable GPU Passthrough?\n\nAutomatically detects and passes through available GPUs\n(Intel/AMD/NVIDIA) for hardware acceleration.\n\nRecommended for: Media servers, AI/ML, Transcoding\n\n(App default: ${var_gpu:-no})" 16 62; then
         _enable_gpu="yes"
       else
         if [ $? -eq 1 ]; then
@@ -1552,13 +1607,179 @@ advanced_settings() {
       ;;
 
     # ═══════════════════════════════════════════════════════════════════════════
-    # STEP 20: Confirmation
+    # STEP 22: Keyctl Support (Docker/systemd)
     # ═══════════════════════════════════════════════════════════════════════════
-    20)
+    22)
+      local keyctl_default_flag="--defaultno"
+      [[ "$_enable_keyctl" == "1" ]] && keyctl_default_flag=""
+
+      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+        --title "KEYCTL SUPPORT" \
+        --ok-button "Next" --cancel-button "Back" \
+        $keyctl_default_flag \
+        --yesno "\nEnable Keyctl support?\n\nRequired for: Docker containers, systemd-networkd,\nand kernel keyring operations.\n\nNote: Automatically enabled for unprivileged containers.\n\n(App default: ${var_keyctl:-0})" 16 62; then
+        _enable_keyctl="1"
+      else
+        if [ $? -eq 1 ]; then
+          _enable_keyctl="0"
+        else
+          ((STEP--))
+          continue
+        fi
+      fi
+      ((STEP++))
+      ;;
+
+    # ═══════════════════════════════════════════════════════════════════════════
+    # STEP 23: APT Cacher Proxy
+    # ═══════════════════════════════════════════════════════════════════════════
+    23)
+      local apt_cacher_default_flag="--defaultno"
+      [[ "$_apt_cacher" == "yes" ]] && apt_cacher_default_flag=""
+
+      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+        --title "APT CACHER PROXY" \
+        --ok-button "Next" --cancel-button "Back" \
+        $apt_cacher_default_flag \
+        --yesno "\nUse APT Cacher-NG proxy?\n\nSpeeds up package downloads by caching them locally.\nRequires apt-cacher-ng running on your network.\n\n(App default: ${var_apt_cacher:-no})" 14 62; then
+        _apt_cacher="yes"
+        # Ask for IP if enabled
+        if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+          --title "APT CACHER IP" \
+          --inputbox "\nEnter APT Cacher-NG server IP address:" 10 58 "$_apt_cacher_ip" \
+          3>&1 1>&2 2>&3); then
+          _apt_cacher_ip="$result"
+        fi
+      else
+        if [ $? -eq 1 ]; then
+          _apt_cacher="no"
+          _apt_cacher_ip=""
+        else
+          ((STEP--))
+          continue
+        fi
+      fi
+      ((STEP++))
+      ;;
+
+    # ═══════════════════════════════════════════════════════════════════════════
+    # STEP 24: Container Timezone
+    # ═══════════════════════════════════════════════════════════════════════════
+    24)
+      local tz_hint="$_ct_timezone"
+      [[ -z "$tz_hint" ]] && tz_hint="(empty - will use host timezone)"
+
+      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+        --title "CONTAINER TIMEZONE" \
+        --ok-button "Next" --cancel-button "Back" \
+        --inputbox "\nSet container timezone.\n\nExamples: Europe/Berlin, America/New_York, Asia/Tokyo\n\nHost timezone: ${_host_timezone:-unknown}\n\nLeave empty to inherit from host." 16 62 "$_ct_timezone" \
+        3>&1 1>&2 2>&3); then
+        _ct_timezone="$result"
+        ((STEP++))
+      else
+        ((STEP--))
+      fi
+      ;;
+
+    # ═══════════════════════════════════════════════════════════════════════════
+    # STEP 25: Container Protection
+    # ═══════════════════════════════════════════════════════════════════════════
+    25)
+      local protect_default_flag="--defaultno"
+      [[ "$_protect_ct" == "yes" || "$_protect_ct" == "1" ]] && protect_default_flag=""
+
+      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+        --title "CONTAINER PROTECTION" \
+        --ok-button "Next" --cancel-button "Back" \
+        $protect_default_flag \
+        --yesno "\nEnable Container Protection?\n\nPrevents accidental deletion of this container.\nYou must disable protection before removing.\n\n(App default: ${var_protection:-no})" 14 62; then
+        _protect_ct="yes"
+      else
+        if [ $? -eq 1 ]; then
+          _protect_ct="no"
+        else
+          ((STEP--))
+          continue
+        fi
+      fi
+      ((STEP++))
+      ;;
+
+    # ═══════════════════════════════════════════════════════════════════════════
+    # STEP 26: Device Node Creation (mknod)
+    # ═══════════════════════════════════════════════════════════════════════════
+    26)
+      local mknod_default_flag="--defaultno"
+      [[ "$_enable_mknod" == "1" ]] && mknod_default_flag=""
+
+      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+        --title "DEVICE NODE CREATION" \
+        --ok-button "Next" --cancel-button "Back" \
+        $mknod_default_flag \
+        --yesno "\nAllow device node creation (mknod)?\n\nRequired for: Creating device files inside container.\nExperimental feature (requires kernel 5.3+).\n\n(App default: ${var_mknod:-0})" 14 62; then
+        _enable_mknod="1"
+      else
+        if [ $? -eq 1 ]; then
+          _enable_mknod="0"
+        else
+          ((STEP--))
+          continue
+        fi
+      fi
+      ((STEP++))
+      ;;
+
+    # ═══════════════════════════════════════════════════════════════════════════
+    # STEP 27: Mount Filesystems
+    # ═══════════════════════════════════════════════════════════════════════════
+    27)
+      local mount_hint=""
+      [[ -n "$_mount_fs" ]] && mount_hint="$_mount_fs" || mount_hint="(none)"
+
+      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+        --title "MOUNT FILESYSTEMS" \
+        --ok-button "Next" --cancel-button "Back" \
+        --inputbox "\nAllow specific filesystem mounts.\n\nComma-separated list: nfs, cifs, fuse, ext4, etc.\nLeave empty for defaults (none).\n\nCurrent: $mount_hint" 14 62 "$_mount_fs" \
+        3>&1 1>&2 2>&3); then
+        _mount_fs="$result"
+        ((STEP++))
+      else
+        ((STEP--))
+      fi
+      ;;
+
+    # ═══════════════════════════════════════════════════════════════════════════
+    # STEP 28: Verbose Mode & Confirmation
+    # ═══════════════════════════════════════════════════════════════════════════
+    28)
+      local verbose_default_flag="--defaultno"
+      [[ "$_verbose" == "yes" ]] && verbose_default_flag=""
+
+      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
+        --title "VERBOSE MODE" \
+        $verbose_default_flag \
+        --yesno "\nEnable Verbose Mode?\n\nShows detailed output during installation." 12 58; then
+        _verbose="yes"
+      else
+        _verbose="no"
+      fi
       # Build summary
       local ct_type_desc="Unprivileged"
       [[ "$_ct_type" == "0" ]] && ct_type_desc="Privileged"
 
+      local nesting_desc="Disabled"
+      [[ "$_enable_nesting" == "1" ]] && nesting_desc="Enabled"
+
+      local keyctl_desc="Disabled"
+      [[ "$_enable_keyctl" == "1" ]] && keyctl_desc="Enabled"
+
+      local protect_desc="No"
+      [[ "$_protect_ct" == "yes" || "$_protect_ct" == "1" ]] && protect_desc="Yes"
+
+      local tz_display="${_ct_timezone:-Host TZ}"
+      local apt_display="${_apt_cacher:-no}"
+      [[ "$_apt_cacher" == "yes" && -n "$_apt_cacher_ip" ]] && apt_display="$_apt_cacher_ip"
+
       local summary="Container Type: $ct_type_desc
 Container ID: $_ct_id
 Hostname: $_hostname
@@ -1573,15 +1794,20 @@ Network:
   IPv4: $_net
   IPv6: $_ipv6_method
 
-Options:
+Features:
-  FUSE: $_enable_fuse
+  FUSE: $_enable_fuse | TUN: $_enable_tun
-  GPU Passthrough: $_enable_gpu
+  Nesting: $nesting_desc | Keyctl: $keyctl_desc
+  GPU: $_enable_gpu | Protection: $protect_desc
+
+Advanced:
+  Timezone: $tz_display
+  APT Cacher: $apt_display
   Verbose: $_verbose"
 
       if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
         --title "CONFIRM SETTINGS" \
         --ok-button "Create LXC" --cancel-button "Back" \
-        --yesno "$summary\n\nCreate ${APP} LXC with these settings?" 28 58; then
+        --yesno "$summary\n\nCreate ${APP} LXC with these settings?" 32 62; then
         ((STEP++))
       else
         ((STEP--))
@@ -1608,11 +1834,30 @@ Options:
   IPV6_GATE="$_ipv6_gate"
   TAGS="$_tags"
   ENABLE_FUSE="$_enable_fuse"
+  ENABLE_TUN="$_enable_tun"
   ENABLE_GPU="$_enable_gpu"
+  ENABLE_NESTING="$_enable_nesting"
+  ENABLE_KEYCTL="$_enable_keyctl"
+  ENABLE_MKNOD="$_enable_mknod"
+  ALLOW_MOUNT_FS="$_mount_fs"
+  PROTECT_CT="$_protect_ct"
+  CT_TIMEZONE="$_ct_timezone"
+  APT_CACHER="$_apt_cacher"
+  APT_CACHER_IP="$_apt_cacher_ip"
   VERBOSE="$_verbose"
 
-  # Update var_gpu based on user choice (for is_gpu_app function)
+  # Update var_* based on user choice (for functions that check these)
   var_gpu="$_enable_gpu"
+  var_fuse="$_enable_fuse"
+  var_tun="$_enable_tun"
+  var_nesting="$_enable_nesting"
+  var_keyctl="$_enable_keyctl"
+  var_mknod="$_enable_mknod"
+  var_mount_fs="$_mount_fs"
+  var_protection="$_protect_ct"
+  var_timezone="$_ct_timezone"
+  var_apt_cacher="$_apt_cacher"
+  var_apt_cacher_ip="$_apt_cacher_ip"
 
   # Format optional values
   [[ -n "$_mtu" ]] && MTU=",mtu=$_mtu" || MTU=""
@@ -1648,7 +1893,13 @@ Options:
   echo -e "${NETWORK}${BOLD}${DGN}IPv4: ${BGN}$NET${CL}"
   echo -e "${NETWORK}${BOLD}${DGN}IPv6: ${BGN}$IPV6_METHOD${CL}"
   echo -e "${FUSE}${BOLD}${DGN}FUSE Support: ${BGN}$ENABLE_FUSE${CL}"
+  [[ "$ENABLE_TUN" == "yes" ]] && echo -e "${NETWORK}${BOLD}${DGN}TUN/TAP Support: ${BGN}$ENABLE_TUN${CL}"
+  echo -e "${CONTAINERTYPE}${BOLD}${DGN}Nesting: ${BGN}$([ "$ENABLE_NESTING" == "1" ] && echo "Enabled" || echo "Disabled")${CL}"
+  [[ "$ENABLE_KEYCTL" == "1" ]] && echo -e "${CONTAINERTYPE}${BOLD}${DGN}Keyctl: ${BGN}Enabled${CL}"
   echo -e "${GPU}${BOLD}${DGN}GPU Passthrough: ${BGN}$ENABLE_GPU${CL}"
+  [[ "$PROTECT_CT" == "yes" || "$PROTECT_CT" == "1" ]] && echo -e "${CONTAINERTYPE}${BOLD}${DGN}Protection: ${BGN}Enabled${CL}"
+  [[ -n "$CT_TIMEZONE" ]] && echo -e "${INFO}${BOLD}${DGN}Timezone: ${BGN}$CT_TIMEZONE${CL}"
+  [[ "$APT_CACHER" == "yes" ]] && echo -e "${INFO}${BOLD}${DGN}APT Cacher: ${BGN}$APT_CACHER_IP${CL}"
   echo -e "${SEARCH}${BOLD}${DGN}Verbose Mode: ${BGN}$VERBOSE${CL}"
   echo -e "${CREATING}${BOLD}${RD}Creating a ${APP} LXC using the above advanced settings${CL}"
 }
@@ -2317,15 +2568,23 @@ build_container() {
   none) ;;
   esac
 
-  # Build FEATURES string
+  # Build FEATURES string based on container type and user choices
-  if [ "$CT_TYPE" == "1" ]; then
+  FEATURES=""
-    FEATURES="keyctl=1,nesting=1"
+
-  else
+  # Nesting support (user configurable, default enabled)
+  if [ "${ENABLE_NESTING:-1}" == "1" ]; then
     FEATURES="nesting=1"
   fi
 
+  # Keyctl for unprivileged containers (needed for Docker)
+  if [ "$CT_TYPE" == "1" ]; then
+    [ -n "$FEATURES" ] && FEATURES="$FEATURES,"
+    FEATURES="${FEATURES}keyctl=1"
+  fi
+
   if [ "$ENABLE_FUSE" == "yes" ]; then
-    FEATURES="$FEATURES,fuse=1"
+    [ -n "$FEATURES" ] && FEATURES="$FEATURES,"
+    FEATURES="${FEATURES}fuse=1"
   fi
 
   # Build PCT_OPTIONS as string for export