mysql修改密碼，開放遠程訪問權限

1. 新安裝好的數據庫查看初始密碼

   grep 'temporary password' /var/log/mysqld.log 
   

2. 修改密碼

   -- mysql8.0版本
   ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "123456";
   
   -- mysql8.0以下版本
   ALTER USER root@localhost IDENTIFIED BY 'admin456rrr';
   

3. 開放遠程訪問權限

-- mysql8.0版本
CREATE USER 'testuser'@'%' IDENTIFIED BY 'testpwd';  -- 創建用戶
GRANT ALL ON *.* TO 'testuser'@'%' WITH GRANT OPTION;  -- 授權
flush privileges; -- 刷新權限

-- mysql8.0以下版本
grant all privileges  on *.* to root@'%' identified by "password";
 flush privileges;