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Is there a way to configure rsyslog to suppress identical duplicate messages?

In certain situations (often hardware failures) my syslog can grow to 100 MB or more due to repeated messages every quarter-second or so.

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which version of rsyslog are you running? –  Nikhil Mulley Dec 8 '11 at 13:22

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up vote 4 down vote accepted

Sounds like you're looking for the $RepeatedMsgReduction config switch, which turns such duplicate messages into one by logging "Last line repeated n times". You can also discard unwanted messages.

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