我相信無數安裝mysql的同學和我一樣，對於mysql那個極不人道的臨時root密碼極為不滿。

我在mysql官網下載的mac版本的安裝包，我用的是dmg格式的，版本是5.7.18。

附上官網連結:https://dev.mysql.com/downloads/mysql/

我的手比較賤，覺得dmg安裝時傻瓜式的，一直按呀按，最後連臨時root密碼也沒記得，根據官網介紹，這個臨時密碼如果你沒記清楚，你就找不到了，而且你用wordkbench連結mysql時必須要用這個root密碼，所以開始了辛酸的reset密碼的過程。網上關於如何重置root密碼的教程可謂是多如牛毛，但是我TM就一個也沒試驗成功的，為啥呢？後來我才明白，mysql版本不斷的更新，reset密碼的步驟一直在變，網上的那些教程都太老了，對於像5.7.18這樣的新版本不適用。在對網上給出的那些教程徹底失望之後，我還是老老實實的到官網manual中尋找最新的解決方案，

我試驗成功的解決步驟：

1，關掉已經在執行的mysql，MAC上可以在偏好設定裡直接關掉或者通過命令列

sudo /usr/local/mysql/support-files/mysql.server stop

2，進入目錄 

cd /usr/local/mysql/bin

3，獲取許可權

sudo su

4，使用下面的命令可以跳過驗證直接啟動伺服器

./mysqld_safe --skip-grant-tables

5，重新開個新終端

6，輸入命令mysql

mysql

7，輸入命令FLUSH PRIVILEGES; 注意帶上後面的";"號

FLUSH PRIVILEGES;

8，輸入一下命令（凡是版本大於等於5.7.6的都這麼輸入，老版本的請看文章最後附上官網介紹）,MyNewPass就是你的新密碼

ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';

現在你已經完成了root密碼的重置，在workbench中連線吧。

附上鍊接：

https://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html#resetting-permissions-unix

B.5.3.2.3 Resetting the Root Password: Generic Instructions

The preceding sections provide password-resetting instructions specifically for Windows and Unix and Unix-like systems. Alternatively, on any platform, you can reset the password using the 

1. Stop the MySQL server if necessary, then restart it with the --skip-grant-tables option. This enables anyone to connect without a password and with all privileges, and disables account-management statements such as ALTER USER and SET PASSWORD. Because this is insecure, you might want to use --skip-grant-tables in conjunction with --skip-networking to prevent remote clients from connecting.

2. Connect to the MySQL server using the mysql client; no password is necessary because the server was started with--skip-grant-tables:

   shell> mysql
   

3. In the mysql client, tell the server to reload the grant tables so that account-management statements work:

   mysql> FLUSH PRIVILEGES;
   

   Then change the 'root'@'localhost' account password. Replace the password with the password that you want to use. To change the password for a root account with a different host name part, modify the instructions to use that host name.

   MySQL 5.7.6 and later:

   mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';
   

   MySQL 5.7.5 and earlier:

   mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('MyNewPass');
   

You should now be able to connect to the MySQL server as root using the new password. Stop the server and restart it normally (without the --skip-grant-tables and --skip-networking options).

If the ALTER USER statement fails to reset the password, try repeating the procedure using the following statements to modify the user table directly:

UPDATE mysql.user SET authentication_string = PASSWORD('MyNewPass')
WHERE User = 'root' AND Host = 'localhost';
FLUSH PRIVILEGES;