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Is there any way to filter messages sent to rsyslog by user id? Let's say I want to ensure, that only messages sent by root should be logged to a separate file (based on rsyslog rules) and messages generated by non-privileged users (e.g. using logger utility) will be discarded.

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Yes you can.

Change the load="imuxsock" line in /etc/rsyslog.conf to:

module(load="imuxsock" SysSock.Annotate="on" SysSock.ParseTrusted="on")

Add to Syslog config:

if $!uid == '0'  then /var/log/root.log
if $!uid == '33' then /var/log/www-data.log

I have learnt this here.

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