Linux下mysql开启远程访问权限以及防火墙开放3306端口

1、首先要进入Linux服务器，查看3306端口是否开启。

netstat -an|grep 3306

  如果显示如下,3306为红色，则表示，端口未开放。

       

 2、修改访问权限

      需要在mysql.conf文件中添加
      port = 3306然后保存。具体怎么打开使用vim。

3、登录数据库

      默认mysql的用户是没有远程访问的权限的，因此当程序跟数据库不在同一台服务器上时，我们需要开启mysql的远程访问权限。

      主流的有两种方法，改表法和授权法。

      相对而言，改表法比较容易一点，因此，这里只贴出改表法

[root@csxt bin]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 5.7.27 MySQL Community Server (GPL)

Copyright (c) 2000, 2019, 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> 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> update user set host = '%' where user = 'root';
Query OK, 1 row affected (0.03 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select host, user from user;
+-----------+---------------+
| host      | user          |
+-----------+---------------+
| %         | root          |
| localhost | mysql.session |
| localhost | mysql.sys     |
+-----------+---------------+
3 rows in set (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.06 sec)
mysql> 

4、防火墙开放3306端口

打开防火墙配置文件

vi /etc/sysconfig/iptables

增加下面一行

-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

重启防火墙

service iptables restart

• 注意：增加的开放3306端口的语句一定要在icmp-host-prohibited之前

个人配置：

# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -i eth0 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
-A FORWARD -p icmp -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -i eth0 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT