logrotate -fv /etc/logrotate.d/mysqld 

Logrotate file:

/san/mysqllogs/slowlogs/slow-log {
        create 640 mysql mysql
        notifempty
        daily
        rotate 5
        missingok
        #compress
    postrotate
	# just if mysqld is really running
	if test -x /usr/bin/mysqladmin && \
	   /usr/bin/mysqladmin --defaults-file=/root/.my.cnf ping &>/dev/null
	then
	   /usr/bin/mysqladmin --defaults-file=/root/.my.cnf flush-logs
	fi
    endscript
}