asterisk.logrotate

Put the following file at: /etc/logrotate.d/asterisk

Make sure it is owned by root with the same permissions and ownership as the other files in the logrotate.d directory.

/var/log/asterisk/messages {
   missingok
   rotate 5
   weekly
   create 0644 enswitch enswitch
   postrotate
       /usr/sbin/asterisk -rx 'logger reload' > /dev/null 2> /dev/null
   endscript
}
/var/log/asterisk/full {
   missingok
   rotate 5
   daily
   create 0644 enswitch enswitch
   postrotate
       /usr/sbin/asterisk -rx 'logger reload' > /dev/null 2> /dev/null
   endscript
}
/var/log/asterisk/cdr-csv/*csv {
  missingok
  rotate 5
  monthly
  create 0644 enswitch enswitch
} 
# substitute "enswitch" with whatever user asterisk is running as

You can test it with the following command:

logrotate -vdf /etc/logrotate.d/asterisk

-v Turn on verbose mode.
-d Turns on debug mode and implies -v. In debug mode, no changes will be made to the logs or to the logrotate state file.
-f, --force
  Tells logrotate to force the rotation, even if it doesn't think this is necessary. Sometimes this is useful after adding new entries to
  logrotate, or if old log files have been removed by hand, as the new files will be created, and logging will continue correctly.

You can run it immediately with the force option:

logrotate -vf /etc/logrotate.d/asterisk

Logrotate Notes (taken from man logrotate):

# Don't complain if the file is missing
 missingok

# Keep 5 rotations
  rotate 5

# Rotate weekly
  # Daily would be "daily"
  weekly

# Make it readable by everybody (-rw-r--r--) and owned by enswitch
  create 0644 enswitch enswitch

# Next three lines run a script to restart asterisk
# The middle line instructs asterisk to reload it's logger module
#  it is needed so that asterisk will write to the new file.
postrotate
 /usr/sbin/asterisk -rx 'logger reload' > /dev/null 2> /dev/null
endscript

Last, the following option as described in the manpage could be useful if you are backing up the cdrs. It would create a unique filename of the old data:

       dateext
              Archive old versions of log files adding a daily extension like YYYYMMDD instead of simply adding a number.

Shamelessly take from: http://www.voip-info.org