ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

# mysql -uroot -p
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

根据my.cnf

[mysqld]
port=23306
basedir=/usr/local/mysql
datadir=/app/data/
socket=/app/data/mysql.sock

建立软链接:

# ln -s /app/data/mysql.sock   /tmp/mysql.sock