Most of the
logrotate setups I've seen on various distros runs out of the
/etc/cron.daily. There's a shell script there aptly named
$ ls -l /etc/cron.daily/logrotate
-rwxr-xr-x 1 root root 180 May 18 2011 /etc/cron.daily/logrotate
If you want to make it run manually simply run the script as root.
$ sudo /etc/cron.daily/logrotate
If you take a look at a script that's typically there it shows you how you can also run
logrotate manually, by simply running
logroate + the path to its configuration file..
if [ $EXITVALUE != 0 ]; then
/usr/bin/logger -t logrotate "ALERT exited abnormally with [$EXITVALUE]"