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Move Nix Store to new partition: Difference between revisions

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The tutorial will teach you how to relocate `/nix` to a new
The tutorial will teach you how to relocate {{ic|/nix}} to a new
device on non `NixOS` Hosts. A summery of how this could be done on nixOS is below
device on non NixOS Hosts. A summary of how this could be done on NixOS is at the bottom.
'''This has not been tested on NixOS'''  but there may still be a way:
'''This has not been tested on NixOS'''  but there may still be a way:


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The device that /nix is on has no more space
The device that /nix is on has no more space


    $ du -h
<syntaxhighlight lang="console">
    Filesystem      Size  Used Avail Use% Mounted on
$ du -h
    /dev/sda1      182G  180G    2G  99% /
Filesystem      Size  Used Avail Use% Mounted on
 
/dev/sda1      182G  180G    2G  99% /
</syntaxhighlight>
Stop nix daemon
Stop nix daemon


    $ sudo systemctl stop nix-daemon.service
<syntaxhighlight lang="console">
$ sudo systemctl stop nix-daemon.service
</syntaxhighlight>
Move backup /nix; mv /nix to /nix.bak


Move backup /nix; mv /nix to /nix.bak
<syntaxhighlight lang="console">
$ ls -alF /nix
total 1068
drwxr-xr-x    4 root root      4096 Jan 22 02:43 ./
drwxr-xr-x  26 root root      4096 Feb  8 12:17 ../
drwxrwxr-t 1555 root nixbld 1077248 Feb  8 12:05 store/
drwxr-xr-x    4 root root      4096 Jan 22 02:43 var/
</syntaxhighlight>


    $ ls -alF /nix
<syntaxhighlight lang="console">
    total 1068
$ cd /
    drwxr-xr-x    4 root root      4096 Jan 22 02:43 ./
$ tar -afp /nix.tgz /nix /nix.bak
    drwxr-xr-x  26 root root      4096 Feb  8 12:17 ../
$ sudo mv /nix /nix.bak # in case something goes horribly wrong
    drwxrwxr-t 1555 root nixbld 1077248 Feb  8 12:05 store/
</syntaxhighlight>
    drwxr-xr-x    4 root root      4096 Jan 22 02:43 var/
    $ cd /
    $ tar -afp /nix.tgz /nix /nix.bak
    $ sudo mv /nix /nix.bak # incase something goes horribly wrong


Mount new device. You will need to add this device to `/etc/fstab`
Mount new device. You will need to add this device to `/etc/fstab`


    $ mount /nix
<syntaxhighlight lang="console">
    $ du -h
$ mount /nix
    Filesystem      Size  Used Avail Use% Mounted on
$ du -h
    /dev/sdb1      300G    0G  300G  0% /nix
Filesystem      Size  Used Avail Use% Mounted on
 
/dev/sdb1      300G    0G  300G  0% /nix
</syntaxhighlight>
Restore /nix from /nix.tgz; verify contents
Restore /nix from /nix.tgz; verify contents


    $ cd /
<syntaxhighlight lang="console">
    $ sudo tar -xf /nix.tgz  
$ cd /
    $ nix-store --verify --check-contents
$ sudo tar -xf /nix.tgz  
$ nix-store --verify --check-contents
</syntaxhighlight>


Start up nixdaemon
Start {{ic|nix-daemon}}
 
    $ sudo systemctl start nix-daemon.service


<syntaxhighlight lang="console">
$ sudo systemctl start nix-daemon.service
</syntaxhighlight>
= NixOS =
= NixOS =
 
{{Merge|Storage_optimization#Moving_the_store|There is some overlap between this page and the subsection of Article Storage Optimization|Talk:Move_Nix_Store_to_new_partition}}
Add [https://github.com/cleverca22/nixos-configs/blob/master/rescue_boot.nix rescue-boot.nix] to your imports section.
Add [https://github.com/cleverca22/nixos-configs/blob/master/rescue_boot.nix rescue-boot.nix] to your imports section.


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run the installer from grub at any time.
run the installer from grub at any time.


adjust your configuration.nix so it expects /nix to be at the new place, and nixos-rebuild boot, so it doesnt break  after you move it
adjust your configuration.nix so it expects {{ic|/nix}} to be at the new place, and nixos-rebuild boot, so it doesnt break  after you move it


Now reboot and move it.
Now reboot and move it.
Retrieved from "https://wiki.nixos.org/wiki/Move_Nix_Store_to_new_partition"