Align NOMAD Pi-hole replica with stack SOP

pihole/bin/render_keepalived_conf.py

@@ -27,22 +27,27 @@ def main() -> int:
     env = load_env(ENV_FILE)
     required = [
         'LAN_INTERFACE', 'VIP_CIDR', 'KEEPALIVED_ROUTER_ID', 'KEEPALIVED_STATE',
-        'KEEPALIVED_PRIORITY', 'KEEPALIVED_PASSWORD', 'PD_PIHOLE_WEB_PORT'
+        'KEEPALIVED_PRIORITY', 'KEEPALIVED_PASSWORD'
     ]
     missing = [k for k in required if not env.get(k)]
     if missing:
         print(f'Missing required vars in {ENV_FILE}: {", ".join(missing)}', file=sys.stderr)
         return 1
 
+    web_port = env.get('PIHOLE_WEB_PORT') or env.get('PD_PIHOLE_WEB_PORT') or env.get('SERENITY_PIHOLE_WEB_PORT') or env.get('RPI4_PIHOLE_WEB_PORT')
+    if not web_port:
+        print('Missing Pi-hole web port in .env (set PIHOLE_WEB_PORT or node-specific port variable).', file=sys.stderr)
+        return 1
+
     keepalived_password = env['KEEPALIVED_PASSWORD']
     if len(keepalived_password) > 8:
         print('KEEPALIVED_PASSWORD must be 8 characters or fewer for VRRP PASS auth.', file=sys.stderr)
         return 1
 
     try:
-        web_port_hex = f"{int(env['PD_PIHOLE_WEB_PORT']):04X}"
+        web_port_hex = f"{int(web_port):04X}"
     except ValueError:
-        print('PD_PIHOLE_WEB_PORT must be an integer.', file=sys.stderr)
+        print('Pi-hole web port must be an integer.', file=sys.stderr)
         return 1
 
     router_id_name = f"pihole_{re.sub(r'[^a-z0-9]+', '_', env['KEEPALIVED_STATE'].lower())}"
@@ -55,6 +60,7 @@ def main() -> int:
         'NOPREEMPT_LINE': nopreempt_line,
     }
     replacements.update({k: env[k] for k in required})
+    replacements['PIHOLE_WEB_PORT'] = web_port
     for key, value in replacements.items():
         rendered = rendered.replace('${' + key + '}', value)