ubios-udapi-server handles:
: This server manages core networking tasks, including WAN configurations, VLAN management, and firewall rule enforcement. Common Management Tasks
Think of it as a real-time, lightweight API gateway specifically for device discovery, adoption, and status updates.
: For IP address assignment and local name resolution. StrongSwan/Oswan : For IPsec and WireGuard VPN tunnels. PPP : For PPPoE fiber connections. Suricata : For IDS/IPS (Intrusion Detection and Prevention). ⚠️ Common Issues and Troubleshooting ubios-udapi-server
On UniFi OS, ubios-udapi-server runs as a systemd service.
Whenever you alter a setting in the UniFi Site Manager —such as adding a VLAN, mapping an IP address, or toggling threat management—the UI does not talk directly to Linux configuration files. Instead, it pushes a JSON configuration state to ubios-udapi-server . The daemon processes this input and configures underlying system programs like udhcpc (DHCP client), nftables (firewall), and dnsmasq (DNS). Core System Responsibilities
The most crucial file on the system is the ubios-udapi-server.state file. This file is the primary configuration database for the ubios-udapi-server and, therefore, for the core of your network. It is typically located at /config/ubios-udapi-server/ubios-udapi-server.state . StrongSwan/Oswan : For IPsec and WireGuard VPN tunnels
| Option | Description | | :--- | :--- | | -h , --help | Displays a list of all available options and their usage. | | -v , --verbose | Increases the verbosity of the log output, providing more detailed information about the server's operations. | | -e , --extremely-verbose | In addition to verbose logs, this prints low-level UDAPI communication data, primarily used for deep debugging. | | -c , --config [arg] | Specifies a custom configuration file to use instead of the default state file. | | -f , --fallback-config [arg] | Specifies a fallback configuration file, typically a device-specific default located in /usr/share/ubios-udapi-server/ . | | -s , --socket [arg] | Defines the path to the server socket used for communication (default is /var/run/ubnt-udapi-server.sock ). |
line. It serves as the primary gateway service responsible for translating high-level UniFi Network configurations into actual system-level routing and firewall commands. Primary Functions Configuration Translation
Author’s note: Ubiquiti firmware changes rapidly. Always test API scripts against a lab device before deploying to production. The examples above work as of UniFi OS 3.2.x. ⚠️ Common Issues and Troubleshooting On UniFi OS,
: Restarting the service via SSH ( systemctl restart ubios-udapi-server ) often clears the buffer. 🛠️ Advanced Usage: The "On-Boot" Scripting
If top or htop reveals that ubios-udapi-server is pinning your CPU at 100%, it usually indicates one of three things:
A self-hosted orchestration platform allowing administrators to run UniFi controllers without local gateways. Native host operating system (UbiOS)
She dove into the server’s internals: /usr/share/ubios-udapi-server/
ps aux | grep udapi