介绍 CentOS7 基本操作：防火墙配置与开放端口设置

简介：
官方提供更加详尽的描述和信息。Firewall provides dynamic management capabilities for network security configurations. It supports the establishment of network firewall zones, which are used to establish trust levels for network connections or interface configurations. This supports IPv4 and IPv6 firewall settings, VLAN bridges, and IP groups. Separate run-time configuration options from permanent configuration settings. Additionally, this platform also provides interface capabilities for directly adding firewall rules to services or applications. 如果只是初步操作, 那么你必须掌握如何检查防火墙的状态，包括防火墙的开关和管理方法。大家都知道，一旦防火墙被打开，总会设置一些端口权限。不能简单地认为你选择的某个端口号就能连接上我的主机（也就是服务器）。反过来，只有我知道开放了哪些端口，你才能通过这些已开放的端口号连接到我的主机。否则我们必须保持防火墙的安全设置。