kimsufi nixos notes

_NOTES.txt

Setup NixOS
===========

Install debian 9

> / for all space, ext4
> swap, 8GB

Boot into rescue


* * *

root@rescue:~# lsblk
NAME   MAJ:MIN RM    SIZE RO TYPE MOUNTPOINT
sda      8:0    0    1.8T  0 disk
├─sda2   8:2    0    1.8T  0 part
├─sda3   8:3    0      8G  0 part
└─sda1   8:1    0 1004.5K  0 part

# Wat??
# Oh well

root@rescue:~# mount /dev/sda2 /mnt

root@rescue:~# ip addr
...
6: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 4c:72:b9:43:50:c9 brd ff:ff:ff:ff:ff:ff
    inet 142.4.208.189/24 brd 142.4.208.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 2607:5300:60:dbd::1/128 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::4e72:b9ff:fe43:50c9/64 scope link
       valid_lft forever preferred_lft forever
...

umount /dev/sda2

`````
## QEMU / VNC installation

`````
# VNC stuff
root@rescue:~# apt-get -y install qemu kvm
# URL from nixos download page
root@rescue:~# wget https://d3_________mrk.cloudfront.net/nixos/17.03/nixos-17.03-___________.iso

# Boot that system
root@rescue:~#
qemu-system-x86_64 \
    -net nic -net user,hostfwd=tcp::80-:80,hostfwd=tcp::443-:443 \
    -m 4096M -localtime -enable-kvm -cpu kvm64,+nx -smp 2 -usbdevice tablet \
    -k en-us -cdrom nixos-minimal-*.iso -hda /dev/sda  -vnc 127.0.0.1:0 \
    -boot d

`````

VNC access

`````
local $ ssh root@SERVER   -L 5900:localhost:5900
`````

`````
local $ vncviewer localhost
`````

THEN, from that point on it's a classic nixos love story.

  * cfdisk
  * mkfs.ext4 -L nixos /dev/sda1
  * mkswap -L swap /dev/sda2

```````
/dev/disk/by-label/nixos -> ../../sda1
/dev/disk/by-label/swap -> ../../sda2
```````
  * swapon /dev/disk/by-label/swap
  * mount /dev/disk/by-label/nixos /mnt
  * nixos-generate-config --root /mnt
  * vim /mnt/etc/nixos/configuration.nix
    Ensure all you need is in there *for a minimal boot*
    This means ssh, and keys.
  * vim /mnt/etc/nixos/hardware-configuration.nix
     -> ensure uuids seem good.
     -> remove qemu-guest and replace with
     ````
         [ <nixpkgs/nixos/modules/installer/scan/not-detected.nix>
         ];
     ````
     Available kernel modules: ahci
     kernelModules: "kvm-intel"
     nix.maxJobs = 4


aaaaand it's done.

earlier notes.txt

Booting the rescue disk, using qemu-kvm to *boot the whole disk*, forwarding the screen through ssh using vnc.

* * *

 * Unfucking through qemu-kvm
 * First, install qemu-kvm stuff
   
    > TODO : Test without upgrading, as upgrading takes WAY TOO MUCH TIME.
 * Download iso by wgetting link from https://nixos.org/nixos/download.html
 * Update your system
       apt-get -y update
       apt-get -y --force-yes upgrade
 * Install qemu + kvm
       apt-get -y install qemu kvm

When all this is done, start the VM:

```
# Boots the iso
root@rescue:~# qemu-system-x86_64 -net nic -net user,hostfwd=tcp::80-:80,hostfwd=tcp::443-:443 -m 4096M \
    -localtime -enable-kvm -cpu kvm64,+nx -smp 2 -usbdevice tablet -k en-us -cdrom nixos-minimal-*.iso \
    -hda /dev/sda  -vnc 127.0.0.1:0
# Boots the system
root@rescue:~# qemu-system-x86_64 -net nic -net user,hostfwd=tcp::80-:80,hostfwd=tcp::443-:443 -m 4096M \
    -localtime -enable-kvm -cpu kvm64,+nx -smp 2 -usbdevice tablet -k fr-ca -cdrom nixos-minimal-*.iso \
    -hda /dev/sda  -vnc 127.0.0.1:0 -boot d                                                                            
```
[local] ⬤  ssh root@SERVER   -L 5900:localhost:5900