nixpkgs/nixos/doc/manual/installation/installing-behind-a-proxy.section.md

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# Installing behind a proxy {#sec-installing-behind-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.
```nix
networking.proxy.default = "http://user:password@proxy:port/";
networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
```
1. Setup the proxy environment variables in the shell where you are
running `nixos-install`.
```ShellSession
# 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"
```
::: {.note}
If you are switching networks with different proxy configurations, use
the `specialisation` option in `configuration.nix` to switch proxies at
runtime. Refer to [](#ch-options) for more information.
:::