Failed to start httpd.service: Unit httpd.service not found.

当出现 "Failed to start httpd.service: Unit httpd.service not found" 错误时，它通常表示系统无法找到httpd服务的单元文件。单元文件是用于管理和启动的配置文件。

常见的解决方法检查httpd服务的单元文件是否存在，并确保其正确安装。您可以执行以下步骤来解决这个问题：

1. 确认httpd服务的单元文件是否存在。您可以使用以下命令检查：

   ls /etc/systemd/system/httpd.service

2. 如果单元文件不存在，则需要重新安装httpd服务。您可以使用以下命令重新安装httpd：

   sudo yum reinstall httpd

3. 如果单元文件存在但未能启动服务，您可以尝试重新加载systemd管理的单元文件：

   sudo systemctl daemon-reload

4. 最后，您可以尝试手动启动httpd服务并检查端口是否已启动。您可以使用以下命令启动httpd服务并检查端口80的状态：

   sudo systemctl start httpd
   ss -ntl

通过执行以上步骤，您应该能够解决 "Failed to start httpd.service: Unit httpd.service not found" 错误，并成功启动httpd服务。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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