1.安装homebrew 终端执行下面命令

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

2. 安装mysql 终端执行下面命令

homebrew install mysql

3. 设置及修改密码 终端执行下面命令

mysql_secure_installation

执行后会有一系列操作，如下

~ git:(master) ✗ mysql_secure_installation

Securing the MySQL server deployment.

Enter password for user root: 

VALIDATE PASSWORD COMPONENT 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 component?

Press y|Y for Yes, any other key for No: No
Using existing password for root.
Change the password for root ? ((Press y|Y for Yes, any other key for No) : No

 ... skipping.
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) : 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.

Disallow root login remotely? (Press y|Y for Yes, any other key for No) : No

 ... 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
 - 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
Success.

All done! 

4. 启动mysql 终端在执行如下命令

// 启动
brew services start mysql 
// 重启
brew services restart mysql

会看到，已经启动，在活动 监视器可以看到

==> Tapping homebrew/services
Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-services'...
remote: Enumerating objects: 20, done.
remote: Counting objects: 100% (20/20), done.
remote: Compressing objects: 100% (20/20), done.
remote: Total 1141 (delta 8), reused 0 (delta 0), pack-reused 1121
Receiving objects: 100% (1141/1141), 331.53 KiB | 10.00 KiB/s, done.
Resolving deltas: 100% (484/484), done.
Tapped 1 command (40 files, 420.6KB).
==> Successfully started `mysql` (label: homebrew.mxcl.mysql)