NixOS: Difference between revisions

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=== Declarative Configuration ===

One of NixOS's most distinguishing features is the ability to ''declaratively configure'' the whole system. This is done by specifying a configuration file which defines which packages are installed on the system, which services to run and various other settings and options. This file is normally called <code>configuration.nix</code> and is found by default at <code>/etc/nixos</code>, although another location can be set using the environment variable <code>NIX_PATH</code>. The system configuration is then built with the command <code>nixos-rebuild</code>. The official website has search tools for browsing the available [https://nixos.org/nixos/options.html# configuration options] and [https://nixos.org/nixos/packages.html packages] (with the exception of proprietary packages).

One of NixOS's most distinguishing features is the ability to ''declaratively configure'' the whole system. This is done by specifying a configuration file which defines which packages are installed on the system, which services to run and various other settings and options. This file is normally called <code>configuration.nix</code> and is found by default at <code>/etc/nixos</code>, although another location can be set using the environment variable <code>NIX_PATH</code>. The system configuration is then built with the command <code>nixos-rebuild</code>. The following is an example of a <code>configuration.nix</code> file:

The following is an example of a <code>configuration.nix</code> file:

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# Import other configuration modules

# (hardware-configuration.nix is autogenerated upon installation)

# paths in nix expressions are always relative the file which defines them

imports =

[

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# Name your host machine

networking.hostName = "mymachine";

# Set your time zone.

time.timeZone = "Europe/Utrecht";

# Enter keyboard layout

services.xserver.layout = "us";

services.xserver.xkbVariant = "altgr-intl";

# Define user accounts

users.~~extraUsers~~ =

users.users =

{

myuser =

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}

</syntaxhighlight>

For inspiration a collection of <code>configuration.nix</code> by NixOS community members can be found in the [[[Configs]] article.

=== Imperative Operations ===

@@ Line 9: / Line 9: @@
 === Declarative Configuration ===
-One of NixOS's most distinguishing features is the ability to ''declaratively configure'' the whole system. This is done by specifying a configuration file which defines which packages are installed on the system, which services to run and various other settings and options. This file is normally called <code>configuration.nix</code> and is found by default at <code>/etc/nixos</code>, although another location can be set using the environment variable <code>NIX_PATH</code>. The system configuration is then built with the command <code>nixos-rebuild</code>. The official website has search tools for browsing the available [https://nixos.org/nixos/options.html# configuration options] and [https://nixos.org/nixos/packages.html packages] (with the exception of proprietary packages).
+One of NixOS's most distinguishing features is the ability to ''declaratively configure'' the whole system. This is done by specifying a configuration file which defines which packages are installed on the system, which services to run and various other settings and options. This file is normally called <code>configuration.nix</code> and is found by default at <code>/etc/nixos</code>, although another location can be set using the environment variable <code>NIX_PATH</code>. The system configuration is then built with the command <code>nixos-rebuild</code>. The following is an example of a <code>configuration.nix</code> file:
-The following is an example of a <code>configuration.nix</code> file:
 <syntaxhighlight lang="nix">
@@ Line 19: / Line 17: @@
      # Import other configuration modules
      # (hardware-configuration.nix is autogenerated upon installation)
+    # paths in nix expressions are always relative the file which defines them
      imports =
          [
@@ Line 29: / Line 28: @@
      # Name your host machine
      networking.hostName = "mymachine";
+    # Set your time zone.
+    time.timeZone = "Europe/Utrecht";
+    # Enter keyboard layout
+    services.xserver.layout = "us";
+    services.xserver.xkbVariant = "altgr-intl";
      # Define user accounts
-     users.extraUsers =
+     users.users =
          {
              myuser =
@@ Line 56: / Line 62: @@
 }
 </syntaxhighlight>
+For inspiration a collection of <code>configuration.nix</code> by NixOS community members can be found in the [[[Configs]] article.
 === Imperative Operations ===