Can't connect to local MySQL server through socket '=/usr/local/mysql/mysql.sock' (2)

[root@dev_121_21 ~]# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '=/usr/local/mysql/mysql.sock' (2)
[root@dev_121_21 ~]#

解决：

[root@dev_121_21 ~]#  vim /root/.bash_profile

# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin
alias mysql='mysql --socket=/usr/local/mysql/mysql.sock'
export PATH