NixOS Wiki

Install NixOS on Rackspace Cloud Servers: Difference between revisions

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You'll need bzip2 later. Also, you'll need to set up some group permissions so NixOS can install properly:
You'll need bzip2 later. Also, you'll need to set up some group permissions so NixOS can install properly:


<pre>
<syntaxhighlight lang="bash">
$ apt-get update && apt-get install bzip2
$ apt-get update && apt-get install bzip2
$ addgroup nixbld && adduser --disabled-password nixbld0 && usermod -a -G nixbld nixbld0
$ addgroup nixbld && adduser --disabled-password nixbld0 && usermod -a -G nixbld nixbld0
</pre>
</syntaxhighlight>


The user is temporary; you'll be erasing everything, after all.
The user is temporary; you'll be erasing everything, after all.
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Now, make sure your partitions are where you expect them, on <tt>/dev/xvdb</tt>.
Now, make sure your partitions are where you expect them, on <tt>/dev/xvdb</tt>.


<pre>
<syntaxhighlight lang="bash">
fdisk -l /dev/xvdb
fdisk -l /dev/xvdb
</pre>
</syntaxhighlight>


Here's what mine look like on a 2gb cloud image:
Here's what mine look like on a 2gb cloud image:


<pre>
<syntaxhighlight lang="bash">
Disk /dev/xvdb: 40 GiB, 42949672960 bytes, 83886080 sectors
Disk /dev/xvdb: 40 GiB, 42949672960 bytes, 83886080 sectors
Units: sectors of 1 * 512 = 512 bytes
Units: sectors of 1 * 512 = 512 bytes
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Device    Boot Start      End  Blocks  Id System
Device    Boot Start      End  Blocks  Id System
/dev/xvda1 *    2048  83875364 41936658+ 83 Linux
/dev/xvda1 *    2048  83875364 41936658+ 83 Linux
</pre>
</syntaxhighlight>


===Format your partitions===
===Format your partitions===
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This will blast away any existing data on your main disk, so make sure you're okay with that.
This will blast away any existing data on your main disk, so make sure you're okay with that.


<pre>
<syntaxhighlight lang="bash">
mkfs.ext4 /dev/xvdb1 -L nixos
mkfs.ext4 /dev/xvdb1 -L nixos
</pre>
</syntaxhighlight>


===Mount your freshly minted filesystems===
===Mount your freshly minted filesystems===
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and mount the new ones we made:
and mount the new ones we made:


<pre>
<syntaxhighlight lang="bash">
$ mount /dev/xvdb1 /mnt && mkdir /mnt/boot
$ mount /dev/xvdb1 /mnt && mkdir /mnt/boot
</pre>
</syntaxhighlight>


==Nix-flavored stuff==
==Nix-flavored stuff==
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We'll need some nix packages to install nix on the target:
We'll need some nix packages to install nix on the target:


<pre>
<syntaxhighlight lang="bash">
bash <(curl https://nixos.org/nix/install)
bash <(curl https://nixos.org/nix/install)
. /root/.nix-profile/etc/profile.d/nix.sh
. /root/.nix-profile/etc/profile.d/nix.sh
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export NIXOS_CONFIG=/root/configuration.nix
export NIXOS_CONFIG=/root/configuration.nix
nix-env -i -A config.system.build.nixos-install -A config.system.build.nixos-option -A config.system.build.nixos-generate-config -f "<nixos>"
nix-env -i -A config.system.build.nixos-install -A config.system.build.nixos-option -A config.system.build.nixos-generate-config -f "<nixos>"
</pre>
</syntaxhighlight>


===Make configuration for your target system===
===Make configuration for your target system===
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Generate a default configuration:
Generate a default configuration:


<pre>
<syntaxhighlight lang="bash">
nixos-generate-config --root /mnt
nixos-generate-config --root /mnt
</pre>
</syntaxhighlight>


This will generate <tt>/mnt/etc/nixos/configuration.nix</tt> and <tt>/mnt/etc/nixos/hardware-configuration.nix</tt>. Eyeball the latter (<tt>nano</tt> is preinstalled) to make sure the filesystem config looks reasonable and that it's detected your cores correctly. Then customize the former to your liking. You'll need to explicitly set up your networking information accordingly.
This will generate <tt>/mnt/etc/nixos/configuration.nix</tt> and <tt>/mnt/etc/nixos/hardware-configuration.nix</tt>. Eyeball the latter (<tt>nano</tt> is preinstalled) to make sure the filesystem config looks reasonable and that it's detected your cores correctly. Then customize the former to your liking. You'll need to explicitly set up your networking information accordingly.
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Here's a sample config from my box:
Here's a sample config from my box:


<pre>
<syntaxhighlight lang="nix">
{ config, pkgs, ... }:
{ config, pkgs, ... }:


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     };
     };
}
}
</pre>
</syntaxhighlight>


Note something <b>very important</b>: we set GRUB to install to <tt>/dev/xvdb</tt>, which is the right thing to do when we install <i>from the rescue image</i>. Once we reboot, we need to change this to point back to `/dev/xvda`, in case of GRUB updates.
Note something <b>very important</b>: we set GRUB to install to <tt>/dev/xvdb</tt>, which is the right thing to do when we install <i>from the rescue image</i>. Once we reboot, we need to change this to point back to `/dev/xvda`, in case of GRUB updates.
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===Actually install the system===
===Actually install the system===


<pre>
<syntaxhighlight lang="bash">
unset NIXOS_CONFIG
unset NIXOS_CONFIG
nixos-install
nixos-install
</pre>
</syntaxhighlight>


That should spend some time downloading and copying stuff around, and then should fail without error. After that, tell the web console to exit rescue mode - your machine will be rebooted, and then you can login to NixOS!
That should spend some time downloading and copying stuff around, and then should fail without error. After that, tell the web console to exit rescue mode - your machine will be rebooted, and then you can login to NixOS!
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