mysql 创建用户

环境说明 CentOS7+php7+nginx1.12.2+mysql5.6 

1.启动数据库并查看数据库状态

[root@bogon etc]# systemctl start mysql.service
[root@bogon etc]# ps aux | grep mysql
root     104146  0.1  0.0 115436  1728 ?        S    11:41   0:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/usr/local/mysql/data --pid-file=/usr/local/mysql/data/bogon.pid
mysql    104243 20.0 24.0 1296356 447960 ?      Sl   11:41   0:01 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=bogon.err --pid-file=/usr/local/mysql/data/bogon.pid
root     104269  0.0  0.0 112724   988 pts/0    S+   11:41   0:00 grep --color=auto mysql

2.链接数据库

[root@bogon etc]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.38 Source distribution

3.查看数据库用户

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select host,user from mysql.user;
+-----------+------+
| host      | user |
+-----------+------+
| 127.0.0.1 | root |
| ::1       | root |
| bogon     |      |
| bogon     | root |
| localhost |      |
| localhost | root |
+-----------+------+

4.创建用户可以远程访问

mysql> grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
Query OK, 0 rows affected (0.00 sec)

允许任何ip地址(%表示允许任何ip地址)的电脑用root帐户和密码(123456)来访问这个mysql server。
注意root账户不一定要存在。

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

flush privileges 命令本质上的作用是将当前user和privilige表中的用户信息/权限设置从mysql库(MySQL数据库的内置库)中提取到内存里。MySQL用户数据和权限有修改后，希望在"不重启MySQL服务"的情况下直接生效，那么就需要执行这个命令。通常是在修改ROOT帐号的设置后，怕重启后无法再登录进来，那么直接flush之后就可以看权限设置是否生效。而不必冒太大风险。

5.查看数据库

mysql> select host,user from mysql.user;
+-----------+------+
| host      | user |
+-----------+------+
| %         | root |
| 127.0.0.1 | root |
| ::1       | root |
| bogon     |      |
| bogon     | root |
| localhost |      |
| localhost | root |
+-----------+------+
7 rows in set (0.00 sec)