Linux Centos 5.4 BTMP file size

centos, discussions, logs, var log

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# 1  
Old 08-11-2010
Linux Centos 5.4 BTMP file size

Dear fellows,

I have Centos 5.4 linux with DNS server, all logs are normal, in my /var/log/ btmp files is getting larger day by day.

What is this btmp file for?
How can i reduce the file siez or control file size.

# 2  
Old 08-11-2010
It's the log file for bad login attempts (see man lastb). If it's growing fast you either have a really dumb user somewhere, or a forgotten script trying old credentials, or someone is trying to own your box. You can have it auto-cleaned using logrotate, or (if you don't need the history) truncate it using
: > /var/log/btmp

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