MySQL will not start
In the Linux command prompt, I ran this:

sh-4.1# perror 122
OS error code 122:  Disk quota exceeded
MySQL error code 122: Internal (unspecified) error in handler
sh-4.1#


Evidently, the first or next binlog cannot be created

Check your diskspace by running

df -h /var/lib/mysql


Clear up the disk so binlogs can be made