我在aws中创建了一个ec2用户服务器。然后安装mysql我已经谷歌这个问题，然后我检查我做得很好。

# mysql --version

mysql  Ver 14.14 Distrib 5.5.58, for Linux (x86_64) using readline 5.1

首先，设置aws inbound 0.0.0.0:3306 # netstat -tln ```
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN

其次，为0.0.0.0创建mysql用户“yj”(我也试过“%”。但它不起作用。所以我也尝试了“0.0.0.0”。） `mysql> select host, user, password from mysql.user;` ```
+------------------+------+-------------------------------------------+
| host             | user | password                                  |
+------------------+------+-------------------------------------------+
| localhost        | root | *some-password                            |
| ip-172-31-86-160 | root |                                           |
| 127.0.0.1        | root |                                           |
| ::1              | root |                                           |
| localhost        |      |                                           |
| ip-172-31-86-160 |      |                                           |
| 0.0.0.0          | yj   | *some-password                            |
+------------------+------+-------------------------------------------+

第三，检查 /etc/my.cnf 文件。 # cat /etc/my.cnf ```
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

Settings user and group are ignored when systemd is used.

If you need to run mysqld under a different user or group,

customize your systemd unit file for mysqld according to the

instructions in http://fedoraproject.org/wiki/Systemd

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

人们说修改 `bind-address=127.0.0.1` 至 `bind-address=0.0.0.0` . 但是我的.cnf文件没有任何绑定地址。所以我想在里面找到另一个conf文件 `/etc/mysql/mysql.conf.d` 或者 `/etc/mysql.conf` 等等。但是没有任何东西 `/etc/my.cnf` 文件。
你能告诉我我错过了什么吗？