CentOS VPS 远程访问的安全配置与实践指南

在现代云计算时代， CentOS VPS（虚拟专用服务器）已经成为开发者部署应用的常见选择，远程访问 VPS 服务器时，安全问题往往被忽视，这可能导致数据泄露、服务中断甚至网络攻击，如何安全地远程访问 CentOS VPS 是每一位网络安全人员必须掌握的技能。

确保安全配置

远程访问 VPS 服务器的第一步是确保其安全配置，VPS 服务器通常运行 CentOS 操作系统，而 CentOS 是高度可定制的,因此必须谨慎配置。

1 启用防火墙和端口控制

防火墙是 VPS 安全的第一道屏障，默认情况下，CentOS 的防火墙可能允许所有端口，这可能带来安全隐患，必须启用防火墙,并限制允许通过的端口。

可以使用 systemctl 命令启用防火墙：

sudo systemctl enable netfilter防火墙

配置防火墙规则,只允许特定端口通过：

sudo nano /etc/sysctl.conf

netfilter防火墙=state:stopped,permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,permanent:permanent,per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