Logback 只会将消息记录到 syslog 一次

Question

I've tried several examples of using logback to write to syslog, but the only that I've found that works is this JavaCodeGeeks example . It writes a message to syslog, but it only writes a message once no matter how many times I run the code. If I change the message it will write it to syslog, but only once.

I'm on Ubuntu 19.10. I've uncommented the following four lines from my /etc/rsyslog.conf and restarted:

# provides UDP syslog reception
module(load="imudp")
input(type="imudp" port="514")

# provides TCP syslog reception
module(load="imtcp")
input(type="imtcp" port="514")

The only change I made to the javacodegeeks code is to comment out the remote appender in logback.xml . It only logs to the localhost syslog.

What causes this weird behavior?

Answer 1

To log all messages you have to set

$RepeatedMsgReduction off

in /etc/rsyslog.conf and restart rsyslog.

https://www.rsyslog.com/doc/v8-stable/configuration/action/rsconf1_repeatedmsgreduction.html

The default was on in Ubuntu 19.10.