吐血推荐:homebrew 安装mysql后，如何配置mysql_homebrew 安装mysql 之后呢

这个是我最新并且一直推崇的方法：
1、安装：sunyichaodeMacBook-Pro:~ sunyichao$ brew install mysql
2、开启mysql：mysql.server start
2、使用mysql的配置脚本：/usr/local/opt/mysql/bin/mysql_secure_installation //mysql 提供的配置向导
启动这个脚本后，即可根据如下命令提示进行初始化设置

sunyichaodeMacBook-Pro:~ sunyichao$ /usr/local/opt/mysql/bin/mysql_secure_installation   //mysql 提供的配置向导
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MySQL to secure it, we'll need the current
password for the root user.  If you've just installed MySQL, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): //输入现行root密码，因为初次使用，所以直接回车
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MySQL
root user without the proper authorisation.

Set root password? [Y/n] Y //是否设置root密码
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..
 ... Success!

By default, a MySQL installation has an anonymous user, allowing anyone to log into MySQL without having to have a user account created for This is intended only for testing, and to make the installation go a bit smoother. You should remove them before moving into a production environment.    
Remove anonymous users? [Y/n] Y //是否删除匿名用户
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] Y //是否禁止远程登录
 ... Success!

By default, MySQL comes with a database named 'test' that anyone can
access.This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] Y //删除测试数据库，并登录
 Dropping test database...
 ... Success!
 Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] Y//重新载入权限表
 ... Success!

All done!  If you've completed all of the above steps, your MySQL
installation should now be secure.

Thanks for using MySQL!

Cleaning up...
sunyichaodeMacBook-Pro:~ sunyichao$
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第二种方法

brew install mysql (安装)
添加修改mysql配置
mysqld --help --verbose | more (查看帮助, 按空格下翻)
你会看到开始的这一行(表示配置文件默认读取顺序)
Default options are read from the following files in the given order: /etc/my.cnf /etc/mysql/my.cnf /usr/local/etc/my.cnf ~/.my.cnf
通常这些位置是没有配置文件的, 所以要自己建一个
ls $(brew --prefix mysql)/support-files/my-* (用这个可以找到样例.cnf)
cp /usr/local/opt/mysql/support-files/my-default.cnf /etc/my.cnf (拷贝到第一个默认读取目录)
按需修改my.cnf
brew services start mysql (启动)
brew services stop mysql (停止)
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第三次方法

mysql 数据库 5.7.5 前后的版本有差异。 
以前的版本会在安装的时候要求输入密码。 
5.7.6 版本会在安装的时候随机生成一个密码，用图形界面化安装的时候会显示密码，而用 brew install mysql命令安装的话，就不会显示密码了。 
这个时候就得用其他办法就解决，否则会报错：

解决方法如官网所示： 
http://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html

图省事的话，可以直接用图形界面安装，之后再用 ALTER USER 来更改密码。
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