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I want to stop rsyslog logging these messages.

[168707.740364] TCP: Peer 192.168.100.1:46199/41503 unexpectedly shrunk window 2027330493:2027331431 (repaired)

I tried this in the /etc/rsyslog.conf but the messages are still logged.

if $msg contains 'unexpectedly' then /dev/null

Can anyone point me in the right direction?

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1 Answer

rsyslog needs a statement to stop logging after the match. Add this line immediately after the if statement you already have.

& ~

You may also need to move both statement up in the conf file so that they are parsed before some of the other statements which might be logging them to messages. I change my rsyslog config to look like the following

/etc/rsyslog.conf ($IncludeConfig /etc/rsyslog.d/*.conf)
/etc/rsyslog.d/40-specificdaemon.conf
/etc/rsyslog.d/99-general.conf

This ensures the order I want and makes it easy for config management to push out updates.

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