UDP Port Monitor

The UDP monitor in updu enables connectionless health checks by sending a datagram to an endpoint and verifying that your service answers back, bypassing the TCP handshake.

Configuration Options

When setting up a UDP monitor, you can configure the following options:

Basic Settings

• Name: A descriptive name for your monitor.
• Group: Optional group assignment for organizing monitors.
• Interval (seconds): How frequently updu should perform the check.
• Timeout (seconds): The maximum time updu will wait for a response datagram before returning a timeout error.

UDP Specific Settings

• Hostname: The IP address or domain name of the service (e.g., 192.168.1.5).
• Port: The UDP port the server is listening on.
• Send Payload: (Optional) An ASCII string describing the payload to insert into the outgoing UDP datagram (e.g., \xff\xff\xff\xffTSource Engine Query\x00 for a Steam game server).
• Expected Response String: (Optional) An ASCII string updu must find in the return packet payload from the server.

Example Use Cases

• Dedicated Game Servers: Check whether older Source-engine games such as Counter-Strike or TF2 are accepting traffic and player queries.