I'm running Ubuntu 12.04 server inside my company network. It requires a proxy in order to access network outside. I configured the proxy during installation. After that, I found my proxy setting was saved in /etc/apt/apt.conf. But it's not in environment variables. However, wget is also able to download a web page through proxy. Where does wget (and other programs) read my proxy setting?
As usual I suppose nobody cared to integrate all the communications settings for the programs used in Linux/Ubuntu, which is a pity.
In 11.10 you have system wide settings in several locations:
... http_proxy="user:firstname.lastname@example.org:port ...
apt has its settings in this file:
wget has its settings in this file following the same format as the
/etc/environment file mentioned above.
Provided 12.04 has the same file configuration as 11.10 regarding these three programs you can edit these files for the server.
I had a script file to change all these things in 11.10 back and forth between my work and home, but now I am not using that script until I know more details about how 12.04 works with these issues.
/etc/wgetrc in which you'll find HTTP and HTTPS proxy lines to uncomment and edit with your proxy settings.
Many of the linux command lines can make use of the environment variables
ftp_proxy. Just set these in your .bashrc file or setup a shell script to set these environment variables prior to running commands such as
export http_proxy=http://proxyserver:port/ export ftp_proxy=http://proxyserver:port/
wget, and many other programs, get proxy information from the http_proxy environment variable. Try the command
echo $http_proxy in a shell to make it is set.