You need MySQL bin logs only if you are replicating the databases.
1. Disable bin logging
nano /etc/my.cnf
2. Comment all bin logging related lines
#log_bin = /var/log/mysql/mysql-bin.log
#expire_logs_days = 10
#max_binlog_size = 100M
3. Restart MySQL
4. Delete the bin log files by entering in mysql with:
mysql
5. Run the following command:
PURGE BINARY LOGS TO 'mysql-bin.03';
where 03 is the last number of the bin log you want to clear.


