这些一一检查 却未发现问题。依旧无法启动。当看到这篇文章：http://codesrocks.com/?p=210，突然发现/etc目录下有mysql这个文件夹，里面同样也有一个my.cnf文件。删之，问题解决。
root@Nano-Server:~# find / -name my.cnf/usr/local/mysql/mysql-test/suite/ndb_rpl/my.cnf/usr/local/mysql/mysql-test/suite/rpl_ndb/my.cnf/usr/local/mysql/mysql-test/suite/rpl/extension/bhs/my.cnf/usr/local/mysql/mysql-test/suite/rpl/my.cnf/usr/local/mysql/mysql-test/suite/ndb_binlog/my.cnf/usr/local/mysql/mysql-test/suite/ndb_big/my.cnf/usr/local/mysql/mysql-test/suite/ndb_team/my.cnf/usr/local/mysql/mysql-test/suite/federated/my.cnf/usr/local/mysql/mysql-test/suite/ndb/my.cnf/usr/local/mysql/my.cnf/etc/my.cnf/etc/mysql/my.cnf