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18.2.5. Log Rotation

The following is a sample /etc/logrotate.conf configuration file:
# rotate log files weekly
# keep 4 weeks worth of backlogs
rotate 4
# uncomment this if you want your log files compressed
All of the lines in the sample configuration file define global options that apply to every log file. In our example, log files are rotated weekly, rotated log files are kept for four weeks, and all rotated log files are compressed by gzip into the .gz format. Any lines that begin with a hash sign (#) are comments and are not processed.
You may define configuration options for a specific log file and place it under the global options. However, it is advisable to create a separate configuration file for any specific log file in the /etc/logrotate.d/ directory and define any configuration options there.
The following is an example of a configuration file placed in the /etc/logrotate.d/ directory:
/var/log/messages {
    rotate 5
    /usr/bin/killall -HUP syslogd
The configuration options in this file are specific for the /var/log/messages log file only. The settings specified here override the global settings where possible. Thus the rotated /var/log/messages log file will be kept for five weeks instead of four weeks as was defined in the global options.
The following is a list of some of the directives you can specify in your logrotate configuration file:
For the full list of directives and various configuration options, see the logrotate(5) manual page.