笔记：Linux系统代理设置

Linux下设置代理问题

Ref:

Proxy server - ArchWiki
Environment variables - ArchWiki
这两篇文档基本可以解决Linux下设置代理的各种问题

How To Use Proxy Server To Access Internet at Shell Prompt With http_proxy Variable
这篇是简单操作版

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之前找了好多教程，都没搞清楚
到头来，发现还是好文档最靠谱

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2019/12/23 更新

• 环境变量设置代理
  在~/.bashrc添加

  export http_proxy=http://<proxy_addr>:<proxy_port>/
  export https_proxy=$http_proxy
  export ftp_proxy=$http_proxy
  export rsync_proxy=$http_proxy
  export no_proxy="localhost,127.0.0.1,localaddress,.localdomain.com"

• sudo命令继承代理
  参考 Sudo Environment variables
  在/etc/sudoers添加

  Defaults env_keep += "ftp_proxy http_proxy https_proxy no_proxy"

  2021/02/24 update
  不要直接更改sudoers文件，而是在/etc/sudoers.d/下增加一个文件比较好

  $ sudo visudo /etc/sudoers.d/env_proxy
  
  # Add following line 
  Defaults env_keep += "ftp_proxy http_proxy https_proxy no_proxy"

  Ref:adding local content in /etc/sudoers.d/ instead of directly modifying sodoers file via visudo

2021/05/09 update

# vim /etc/sudoers.d/05_proxy

Defaults env_keep += "*_proxy *_PROXY"

Ref: ArchWiki - Proxy server: Keep proxy through sudo

• Snap下载使用代理
  参考 How to install snap packages behind web proxy on Ubuntu 16.04
  命令行敲

  $ sudo snap set system proxy.http="http://<proxy_addr>:<proxy_port>"
  $ sudo snap set system proxy.https="http://<proxy_addr>:<proxy_port>"

• ubuntu sudo继承代理
  参考 How to keep environment variables when using sudo
  ubuntu的似乎还有一点区别，不能写在一行里面

  sudo visudo
  
  # For Ubuntu 14, you need to specify in separate lines as it returns the errors for multi-variable lines:
  Defaults  env_keep += "http_proxy"
  Defaults  env_keep += "https_proxy"
  Defaults  env_keep += "HTTP_PROXY"
  Defaults  env_keep += "HTTPS_PROXY"

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2021/04/10 update

curl and pacman

Ref: ArchWiki - Proxy server: crul and pacman

You may set the all_proxy environment variable to let curl and pacman (which uses curl) use your socks5 proxy:
$ export all_proxy="socks5://your.proxy:1080"