允许其他主机访问MySQL数据库

blog-host主机访问不了mysql-host上的MySQL数据库

# 数据库服务器的地址
[root@mysql-host ~]# ip add show | grep -i eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    inet 192.168.8.12/24 brd 192.168.8.255 scope global eth0
[root@mysql-host ~]# 

[root@blog-host ~]# ip add show | grep -i eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    inet 192.168.8.11/24 brd 192.168.8.255 scope global eth0
[root@blog-host ~]# 
[root@blog-host ~]# mysql -uroot -p -h 192.168.8.12 --skip-ssl
Enter password: 
ERROR 1130 (HY000): Host '192.168.8.11' is not allowed to connect to this MySQL server
[root@blog-host ~]# 

myql-host

# 修改MySQL服务器，允许其他主机访问
[root@mysql-host ~]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.7.44 MySQL Community Server (GPL)

Copyright (c) 2000, 2023, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

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 user;
+-----------+---------------+
| host      | user          |
+-----------+---------------+
| localhost | mysql.session |
| localhost | mysql.sys     |
| localhost | root          |
+-----------+---------------+
3 rows in set (0.00 sec)

mysql> update user set host="%" where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

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

mysql> exit;
Bye
[root@mysql-host ~]# 

blog-host

# 访问MySQL服务器
[root@blog-host ~]# mysql -uroot -p -h 192.168.8.12 --skip-ssl
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 5.7.44 MySQL Community Server (GPL)

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

mysql> exit;
Bye
[root@blog-host ~]#