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I noticed that my catalina.out in /var/log/tomcat is this big... why? How do I avoid this?

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Disable logging, maybe? Look what's in it – is it necessary? – slhck Nov 3 '11 at 16:12
Yes it is! Is there a way to have it cut the file like log4j does? – user19203 Nov 3 '11 at 16:24

Check out the Apache Tomcat Logging FAQ, which points to a thread on how to rotate catalina.out:

On Unix I simply pipe the command to /usr/bin/cronolog and it rotates the log for me. See for more info...

And as @slhck points out, there are some other good instructions on catalina.out rotation.

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