Yes, when sending log messages from Busybox to rsyslog, you typically need to set up UDP (User Datagram Protocol) communication to enable the transmission of log data. Here's why:
Transport Protocol: By default, rsyslog listens for incoming log messages on UDP port 514. This is the standard port for syslog messages. To communicate with rsyslog, you should use the same protocol and port it is configured to listen on.
UDP vs. TCP: Syslog communication can be done over both UDP and TCP. UDP is connectionless and faster but does not guarantee message delivery or order. TCP, on the other hand, is connection-oriented, ensuring reliable message delivery and order, but it may introduce additional overhead.
Default Configuration: Many rsyslog installations have a default configuration that listens for incoming syslog messages over UDP. If you haven't specifically configured it otherwise, you should use UDP to send logs from Busybox to rsyslog for compatibility.
To summarize, while it's possible to use TCP for log forwarding with rsyslog, it's common and straightforward to set up UDP communication between Busybox and rsyslog, as long as the receiving rsyslog server is configured to listen on the specified UDP port.
references:
OpenAI
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