Mac OS安装MySQL
在Mac环境下安装MySQL有很多中选择，可以去MySQL官网下载相应的安装自己安装，也可以使用Homebrew这样的包管理工具进行安装。推荐使用Homebrew进行安装，具体的安装步骤如下：
1、安装Homebrew，Homebrew的安装及简单的操作参见我的另一篇博客：https://mp.csdn.net/mdeditor/84956361#
2、brew doctor确认brew在正常工作（执行这条命令会弹出一些warning信息，可以不去管他）
3、brew update更新Homebrew
4、brew install mysql 安装mysql
5、mysql.server start 启动mysql服务（mysql.server stop 关闭mysql服务）
6、执行mysql_secure_installation完成相关的配置，如下所示（其中有注释的地方都是需要自己手动填写的，需要注意一下）：
Securing the MySQL server deployment.
Connecting to MySQL using a blank password.
VALIDATE PASSWORD PLUGIN can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
//这里时提醒你设置密码
secure enough. Would you like to setup VALIDATE PASSWORD plugin?
Press y|Y for Yes, any other key for No: y
There are three levels of password validation policy:
LOW Length >= 8
MEDIUM Length >= 8, numeric, mixed case, and special characters
STRONG Length >= 8, numeric, mixed case, special characters and dictionary file
// 这里提示选一个密码强度等级
Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 1
Please set the password for root here.
// 然后按照所选的密码强度要求设定密码
New password:
Re-enter new password:
Estimated strength of the password: 50
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y
... Failed! Error: Your password does not satisfy the current policy requirements
//尝试了一下，选择0或者1都会显示这条错误，让你再次设置密码，建议设置一个稍微复杂一些的密码
New password:
Re-enter new password:
Estimated strength of the password: 100
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. 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.
// 这里删除默认无密码用户
Remove anonymous users? (Press y|Y for Yes, any other key for No) : y
Success.
Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network.
// 禁止远程root登录，我选的是禁止，不管自己的电脑上有没有敏感信息，都需要养成这样的安全意识，哈哈哈
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y
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.
// 这里删除默认自带的test数据库
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : n
... skipping.
Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y
Success.
All done!
7、好了，使用Homebrew安装配置mysql完毕，下面测试一下：
先启动mysql服务：
mysql.server start
登陆mysql：
mysql -u root -p
会提示你输入密码，就是在上面执行mysql_secure_installation命令后你设置的密码；
最后，使用完毕后记得停止mysql服务：
mysql.server stop