报错
Can 't connect to local MySQL server through socket '/tmp/mysql.sock '(2) "
Can 't connect to local MySQL server through socket '/tmp/mysql.sock '(111) "
my.cnf
查看安装目录下的 /conf/my.cnf 文件，也可能是 /etc/my.cnf，/etc/mysql/my.cnf，/usr/local/mysql/etc/my.cnf 或者 ~/.my.cnf：
socket=/data/mysql/tmp/mysql.sock
原来里面指定的 socket 位于 /data/mysql/tmp/mysql.sock
解决
cd /tmp
ln -s /data/mysql/tmp/mysql.sock mysql.sock
