nixosConfig

Introduction

Personal configs for different machines. They have to be compiled symlinking the target machine nix file as default configuration. Due to the fact that /etc/nixos resides on a git repo, is possible to rollback, as well to have the same configuration on the machines.

Installation procedure

Boot the Nixos iso, and you will be prompted as root.

The first step is to prepare the disks for the installation (see below). Mount the filesystems at the relevant mountpoints (/mnt, /boot, /home and swap). Then, make a configuration:

# nixos-generate-config --root /mnt

Now, the directory /etc/nixos is created in the host system. Remember that in this stage we need to address the host path prepending /mnt:

Install git:

# nix-env -iA nixos.pkgs.git

and clone the repository in a folder:

# git clone https://github.com/p-marco/nixosConfig

Target the relevant profile in ./machines and select it by symlinking to nixos/configuration.nix (e.g. here the machine is "vm"):

# unlink /mnt/etc/nixos/configuration.nix
# ln -s ~/nixosConfig/machines/vm.nix /mnt/etc/nixos/configuration.nix

Then the installation can be now started via:

# nixos-install

And then is possible to reboot the system and it will be fully functional.

Partitioning

Partition scheme

GPT/BIOS (requires GRUB on sda)

DEVICE      MOUNTPOINT          FILESYSTEM      CODE
----------------------------------------------------
sda1        boot (no MOUNT)     nofs            ef02
sda2        /boot               ext4            8300
sda3                                            8e00
    root    /                   ext4
    swap                        swap
    home    /home               ext4

GPT/UEFI

DEVICE      MOUNTPOINT          FILESYSTEM      CODE
----------------------------------------------------
sda1        /boot               efi             ef00
sda3                                            8e00
    root    /                   ext4
    swap                        swap
    home    /home               ext4

Sda3 is an encrypted LVM (I am copying from the useful post at https://qfpl.io/posts/installing-nixos/).

Gdisk

Make sure about the device via lsblk.Then run (/dev/sda needs to be edit accordingly). I use /dev/sda3 for all the configurations (efi and bios, in order to have a similar behaviour):

# gdisk /dev/sda

EFI

-- Create the EFI boot partition
Command: n
Partition number: 1
First sector: <enter for default>
Last sector: +1G       --  make a 1 gigabyte partition
Hex code or GUID: ef00 -- this is the EFI System type
-- Create the LVM partition
Command: n
Partition number: 3
First sector: <enter for default>
Last sector: <enter for default - rest of disk>
Hex code or GUID: 8e00 -- Linux LVM type
-- Write changes and quit
Command: w

BIOS

-- Create the BIOS partition
Command: n
Partition number: 1
First sector: <enter for default>
Last sector: +12M       --  make a 12 megabyte partition
Hex code or GUID: ef02  -- this is the EFI System type
-- Create the boot partition
Command: n
Partition number: 2
First sector: <enter for default>
Last sector: +512M      --  make a 512 megabyte partition
Hex code or GUID: 8300  -- this is the EFI System type
-- Create the LVM partition
Command: n
Partition number: 3
First sector: <enter for default>
Last sector: <enter for default - rest of disk>
Hex code or GUID: 8e00 -- Linux LVM type
-- Write changes and quit
Command: w

Setting LUKS

-- Setting up passcode and give a name (lvm-enc)
# cryptsetup luksFormat /dev/sda3
# cryptsetup luksOpen /dev/sda3 lvm-enc

-- Create the container (lvm-vg)
# pvcreate /dev/mapper/lvm-enc 
# vgcreate lvm-vg /dev/mapper/lvm-enc

-- Create volumes in lvm-vg
# lvcreate -L 65G -n root lvm-vg
# lvcreate -L 16G -n swap lvm-vg
# lvcreate -l 100%FREE -n home lvm-vg

Create filesystems

I am going to use ext4 for the most:

# mkfs.ext4 -L root /dev/lvm-vg/root
# mkfs.ext4 -L home /dev/lvm-vg/home

Then, if BIOS:

# mkfs.ext4 -L boot /dev/sda2 # ONLY BIOS

Otherwise, /dev/sda2 doesn't exist. For EFI systems, VFAT is required for boot:

# mkfs.vfat -n boot /dev/sda1 # ONLY UEFI

Then make and activate the swap:

# mkswap -L swap /dev/lvm-vg/swap
# swapon /dev/lvm-vg/swap

Mount the filesystems

Now we can mount the filesystems:

# mount /dev/lvm-vg/root /mnt
# mkdir /mnt/boot
# mkdir /mnt/home
# mount /dev/lvm-vg/home /mnt/home

For EFI:

# mount /dev/sda1 /mnt/boot

FOR BIOS:

# mount /dev/sda2 /mnt/boot

Now is possible to follow the installation procedure.

Wireless Connection

Set the wpa passphrase via

# wpa_passphrase SSID password > wpa_supplicant.conf

Check the interface via ifconfig and run the script on that interface:

# wpa_supplicant -B -i <interface> -c wpa_supplicant.conf

Wait some seconds and restart the service:

# systemctl restart wpa_supplicant

If it runs, you will be able to ping.

Home manager

User profiles are specified into ./home-manager. Give this folder permission access to r/w operations:

# chmod -R 755 <directory>/home-manager

Install home-manager for each user:

$ mkdir -m 0755 -p /nix/var/nix/{profiles,gcroots}/per-user/$USER

$ nix-channel --add https://github.com/rycee/home-manager/archive/release-19.03.tar.gz home-manager
$ nix-channel --update

Logout and login, then:

$ nix-shell '<home-manager>' -A install

Now remove the file generated and symlink to the relevant user and build the generation:

$ rm -rf ~/.config/nixpkgs/home.nix
$ ln -s /etc/nixosConfig/home/manager/USER.nix ~/.config/nixpkgs/home.nix
$ home-manager switch

p-marco / nixosconfig Goto Github PK

nixosconfig's Introduction