错误：The server quit without updating PID file
看错误日志：
Setting lower_case_table_names=2 because file system for /usr/local/mysql/data/ is case insensitive
mysqld: File ‘./mysql-bin.index‘ not found (Errcode: 13 - Permission denied)，权限问题
修改权限
$ cd /usr/local/mysql
$ sudo chown -R _mysql:_mysql *