logrotate slowlog of MySQL

my.cnf

## /usr/local/etc/my.cnf
[mysqladmin]
user=root
password=hogefuga

mysql

## /etc/logrotate.d/mysql
/var/lib/mysql/mysqld-slow.log {
        create 664 mysql mysql
        notifempty
        compress
        daily
        dateext
        dateformat -%Y%m%d
        rotate 60
        olddir /var/log/mysql
        missingok
    postrotate
        if test -x /usr/bin/mysqladmin && \
           /usr/bin/mysqladmin --defaults-extra-file=/usr/local/etc/my.cnf ping &>/dev/null
        then
           /usr/bin/mysqladmin --defaults-extra-file=/usr/local/etc/my.cnf flush-logs
        fi
    endscript
}