All matches were filtered out by exclude filtering for argument: nginx Error: Unable to find a match: nginx

该错误通常是由于在使用过滤器时排除了所有匹配项导致的。您需要仔细检查您的过滤器设置，确保它们正确地指定了包括和排除条件。如果您仍然无法解决问题，请考虑重新安装 Nginx 并执行其他调试步骤来确定问题的根本原因。

相关问题

Last metadata expiration check: 0:15:19 ago on Wed 07 Jun 2023 02:16:26 PM CST. All matches were filtered out by exclude filtering for argument: httpd Error: Unable to find a match: httpd

这个错误提示是因为在执行 `sudo yum install httpd` 命令时，系统无法找到 `httpd` 包。这可能是因为您的 CentOS 系统中没有启用相应的软件源。

您可以尝试使用 `sudo yum search httpd` 命令来查找 `httpd` 包，看看它是否存在于您的软件源中。如果没有找到，您可以尝试更新系统并启用额外的软件源，如 EPEL。

以下是启用 EPEL 软件源的步骤：

1. 下载 EPEL 软件源安装包：

sudo yum install epel-release

2. 安装 Apache：

sudo yum install httpd

之后，您应该可以成功安装 Apache 了。

NameError: name 'filtered' is not defined

This error occurs when you try to reference a variable or function that has not been defined in the current scope.

For example, if you have code that tries to use a variable named "filtered" but you have not previously defined it in that code block or in a parent scope, you will get the "NameError: name 'filtered' is not defined" message.

To fix this error, you need to define the variable or function before you try to use it. Check your code to make sure that you have defined all necessary variables and functions in the appropriate scope.