# Installing behind a proxy

To install NixOS behind a proxy, do the following before running `nixos-install`.

1. Update proxy configuration in `/mnt/etc/nixos/configuration.nix` to keep the internet accessible after reboot.

       networking.proxy.default = "http://user:password@proxy:port/";
       networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

2. Setup the proxy environment variables in the shell where you are running `nixos-install`.

       # proxy_url="http://user:password@proxy:port/"
       # export http_proxy="$proxy_url"
       # export HTTP_PROXY="$proxy_url"
       # export https_proxy="$proxy_url"
       # export HTTPS_PROXY="$proxy_url"

If you are switching networks with different proxy configurations, use the `nesting.clone` option in `configuration.nix` to switch proxies at runtime. Refer to for more information.