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Update ch05-webpage.md
在安装Nginx后,增加了开启Debian系统上默认的防火墙组件Uncomplicated Firewall (UFW),以便启用 HTTP (80) 和 HTTPS (443) 端口流量的步骤。
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
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3. 如果无法看到上述Nginx默认页面,可能是需要配置Debian系统上默认的防火墙组件Uncomplicated Firewall (UFW),以便启用 HTTP (80) 和 HTTPS (443) 端口流量。
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a. 验证方法,输入:
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```shell
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sudo ufw status
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```
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b. 如果输出如下,表明80和433端口未开启,需要执行c步骤
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```shell
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Status: active
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To Action From
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-- ------ ----
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22/tcp ALLOW Anywhere
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22/tcp (v6) ALLOW Anywhere (v6)
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```
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c. 启用UFW的Nginx 80 和 443 端口命令
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```shell
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sudo ufw allow 'Nginx Full'
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```
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d. 输入a中命令再次验证,如果输出如下,表示Nginx流量已经被防火墙放行,这样就应该可以看到前述第2点中的Nginx默认页面。
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```shell
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Status: active
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To Action From
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-- ------ ----
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22/tcp ALLOW Anywhere
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Nginx Full ALLOW Anywhere
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22/tcp (v6) ALLOW Anywhere (v6)
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Nginx Full (v6) ALLOW Anywhere (v6)
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```
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## 5.3 创建一个最简单的网页
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1. 小小白白 Linux 基础命令:
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