1.执行安装命令

brew install mysql

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

unset TMPDIR

mysql_install_db --verbose --user=root --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp

mysql.server start

mysql -uroot -p

搞定！