Question : Where is mysql using my drive space?

Mysql seems to 8GB of data.
du -hs /var/lib/mysql/
8.1G    /var/lib/mysql/

Problem is I need that space, and I can't figure out what uses all of it.
All databases I have should be really small, which I try to prove below
$ mysqldump -u root -p --all-databases > alldatabases.sql
Enter password:
$ ls -lh alldatabases.sql
-rw-r--r-- 1 aegir aegir 32M Jul  3 14:41 alldatabases.sql

So why does mysql have a number of gigabyte-sized mysqld-bin.xxxxxx?
# du -hsm /var/lib/mysql/* | sort -n | tail
92      /var/lib/mysql/mysqld-bin.000105
274     /var/lib/mysql/mysqld-bin.000121
682     /var/lib/mysql/mysqld-bin.000116
761     /var/lib/mysql/mysqld-bin.000102
928     /var/lib/mysql/mysqld-bin.000120
1026    /var/lib/mysql/mysqld-bin.000112
1026    /var/lib/mysql/mysqld-bin.000113
1026    /var/lib/mysql/mysqld-bin.000114
1026    /var/lib/mysql/mysqld-bin.000115
1026    /var/lib/mysql/mysqld-bin.000119

Answer : Where is mysql using my drive space?

Try this commands (from MySql server command line):

flush logs;
reset master;

You can also disable mysqld-bin logs in commenting out log-bin in conf file