mysql/MariaDB 搭建后创建密码及开启远程

创建密码：

mysqladmin -u root -p password 123

或

MariaDB [(none)]> use mysql
MariaDB [mysql]> update user set password=password("")where user='root';
Query OK,  rows affected (0.00 sec)
Rows matched:  Changed:  Warnings:
MariaDB [mysql]> flush privileges;
Query OK,  rows affected (0.00 sec)

开启远程服务：

查看user表：可以发现表中没有开启远程的服务 %   |  root

mysql> use mysql;
Database changed
mysql> select host,user,password from user;
+--------------+------+-------------------------------------------+
| host         | user | password                                  |
+--------------+------+-------------------------------------------+
| localhost    | root | *A731AEBFB621E354CD41BAF207D884A609E81F5E |
| 127.0.0.1    | root | *A731AEBFB621E354CD41BAF207D884A609E81F5E |
+--------------+------+-------------------------------------------+
 rows in set (0.00 sec)

实现远程连接(授权法)：

将host字段的值改为%就表示在任何客户端机器上能以root用户登录到mysql服务器，建议在开发时设为%。   
update user set host = ’%’ where user = ’root’;        将权限改为ALL PRIVILEGES

MariaDB [(none)]> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'IDENTIFIED BY '12345' WITH GRANT OPTION;        （MYSQL> update user set host='%' where user='root';）这里区分下不太版本的命令
Query OK,  rows affected (0.00 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> select host,user,password from user;
+-----------+------+-------------------------------------------+
| host      | user | password                                  |
+-----------+------+-------------------------------------------+
| localhost | root | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
| 127.0.0.1 | root | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
| ::1       | root | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
| localhost |      |                                           |
| %         | root | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
+-----------+------+-------------------------------------------+
5 rows in set (0.00 sec)

这样机器就可以以用户名root密码远程访问该机器上的MySql.

创建数据库(在root权限下)
create database mydb;
//授权admin用户拥有mydb数据库的所有权限。
>grant all privileges on mydb.* to admin@localhost identified by 'admin';
//刷新系统权限表
mysql>flush privileges;

删除用户。
@>mysql -u root -p
@>密码
mysql>DELETE FROM user WHERE User="admin" and Host="localhost";
mysql>flush privileges;
//删除用户的数据库
mysql>drop database mydb;

修改指定用户密码。
@>mysql -u root -p
@>密码
mysql>update mysql.user set password=password('新密码') where User="admin" and Host="localhost";

mysql>flush privileges;