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Recipe 9.30 Rotating Log Files
9.30.1 Problem
You want to control and organize your
ever-growing log files.
9.30.2 Solution
Use logrotate, a program to compress and/or delete
log files automatically when they are sufficiently old, perhaps after
they have been stashed away on tape backups.Add entries to /etc/logrotate.d/syslog, e.g.:
/etc/logrotate.d/syslog:
/var/log/local0 /var/log/local1 ...others... {
sharedscripts
postrotate
/bin/kill -HUP `cat /var/run/syslogd.pid`
endscript
}
9.30.3 Discussion
Log files should be rotated so they won't grow
indefinitely. Our recipe shows a simple configuration that can be
used with logrotate to do this automatically.
After the files are shuffled around, the
postrotate script sends a signal to the system
logger to reopen the log files, and the
sharedscripts directive ensures that this is
done only once, for all of the log files.You can add a separate configuration file (with any name) in the
/etc/logrotate.d directory, as an alternative to
editing the /etc/logrotate.d/syslog file.
Separate entries can be used to tune the default behavior of
logrotate, which is described by
/etc/logrotate.conf, e.g., to rotate some log
files more frequently.
9.30.4 See Also
logrotate(8), syslogd(8).
