MySQL change directory, copy the original installation directory directly

Recently installed in Ubuntu under the MySQL, because it has been installed once, compiled and installed, this time want to directly install the original copy to use, the following to remember the problems encountered.

Configuration file my.cnf directly below the MySQL directory/data/server/mysql/

Start command mysqld--DEFAULTS-FILE=/DATA/SERVER/MYSQL/MY.CNF &

After compiling the installation, now using the Mysql-uroot connection can not find the socket, do a link

Ln-s/data/mysqldata/mysqld.socket/var/run/mysqld/mysqld.socket