mac下推荐使用brew来管理软件包，方便软件的安装和卸载，解决安装包的依赖，官网地址
- 安装mysql
- 设置开机启动 （可选）
- 启动mysql
- 安装密码安全插件（可选）
- 修改root密码
-- 安装mysql
brew install mysql
-- 设置开机启动
ln -sfv /usr/local/opt/mysql/*.plist ~/Library/LaunchAgents
-- 启动mysql
mysql.server start
FengjxMac:~ fengjianxin$ mysql_secure_installation （修改root密码）
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
secure enough. Would you like to setup VALIDATE PASSWORD plugin?
Press y|Y for Yes, any other key for No: y （是否安装密码安全插件，开发环境可以选n）
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
Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 0 （安全模式0低，1中等，2强）
Please set the password for root here.
New password:（输入新密码）
Re-enter new password:（再次输入新密码）
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.
Remove anonymous users? (Press y|Y for Yes, any other key for No) : n （是否删除匿名用户）
... skipping.
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? (Press y|Y for Yes, any other key for No) : n （是否禁止root远程登录）
... skipping.
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? (Press y|Y for Yes, any other key for No) : y （是否删除测试数据库）
- 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? (Press y|Y for Yes, any other key for No) : y （是否重新加载权限）
Success.
All done!
-- 如果不想使用复杂的密码，可以不安装或者卸载掉密码安全插件（比如开发环境）
-- 登录root用户
mysql -uroot -p
mysql> UNINSTALL PLUGIN validate_password; (卸载密码安全插件)
Query OK, 0 rows affected (0.00 sec)
-- 再按照上面的操作，使用mysql_secure_installation修改root密码即可
** 我的博客：http://blog.fengjx.com/post/77624e8fbc9c11e6937f00163e001d4a**
