fedora linux中的dnf使用代理服务器连接软件源更新rpm包

原文地址：https://www.cyberciti.biz/faq/how-to-use-dnf-command-with-a-proxy-server-on-fedora/

我的Fedora Linux工作站只能通过集团公司的代理服务器上网。我怎样才能使用dnf呢？我应该如何配置dnf呢？Dnf软件源(“repos”) 能够通过squid等代理服务器接入互联网。配置文件为/etc/dnf/dnf.conf，格式如下：

1. proxy=http://URL:PORT/ – 代理服务器的URL地址。URL地址必须完整，包括TCP端口号。如果代理服务器需要用户名和密码认证。请再添加下边两行。
2. proxy_username=YOUR-PROXY-USERNAME-HERE (optional)- 用户名。
3. proxy_password=YOUR-SUPER-secrete-PASSWORD-HERE (optional) –密码。

配置：通过代理服务器使用dnf

首先，以管理员身份登录或以管理员身份执行：

# vi /etc/dnf/dnf.conf

或者

$ sudo vi /etc/dnf/dnf.conf

再文件的最后，加入以下内容：

proxy=http://server1.cyberciti.biz:3128proxy_username=vivekproxy_password=secretePasswordHere

保存文件。比如，我的文件中完整的配置/etc/dnf/dnf.conf：

[main]

gpgcheck=1

installonly_limit=3

clean_requirements_on_remove=true

proxy=http://server1.cyberciti.biz:3128

proxy_username=vivek

proxy_password=secretePasswordHere

Please note that defining a proxy server, username, and password in dnf.conf file means all users connect to the proxy server with those details when using dnf command:

# dnf update

# dnf install foo

How do I enable proxy access for a specific user such as root user only?

Linux and UNIX-like system has environment variable called http_proxy. It allows you to connect text based session and applications via the proxy server. Type the following command at shell prompt:

# export http_proxy="http://server1.cyberciti.biz:3128"

OR

# export http_proxy="http://PROXY=USERNAME=HERE:PROXY=PASSWORD=HERE@URL:PORT"

# export http_proxy="http://vivek:secretePassword@server1.cyberciti.biz:3128"

Feel free to add the above line in the to your shell profile file such as ~/.bash_profile. See how to set or export: http_proxy with special characters in password on a Unix or Linux based system for more information.