MySQL binary log files take all of my disk space
If you have enabled binary log in your MySQL server, most likely you are using the replication feature. You don't need to keep the binary log forever, so in the my.cnf, add the line
expire_logs_days = 10
So your MySQL server (master) would keep at most binary log for 10 days. (Notes: you might need to adjust this value, make sure your MySQL slave is able to catch up the updates within 10 days)
However, if you are not using replication, you can consider disable the binary log, e.g. edit the my.cnf, comment out the "log-bin"