Bcachefs: Difference between revisions

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--label=hdd.hdd3 /dev/sde \

--label=ssd.ssd1 /dev/sdf \

--label=ssd.ssd2 /dev/sdg

--label=ssd.ssd2 /dev/sdg \

--foreground_target=ssd \

--promote_target=ssd \

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--label=hdd.hdd3 /dev/sde \

--label=ssd.ssd1 /dev/sdf \

--label=ssd.ssd2 /dev/sdg

--label=ssd.ssd2 /dev/sdg \

--foreground_target=ssd \

--promote_target=ssd \

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== Tips and tricks ==

~~=== Generate bcachefs enabled installation media ===~~

~~Use following Nix [[Flakes|Flake-expression]] to generate a ISO installation image with a bcachefs enabled kernel~~

~~{{file|flake.nix|nix|<nowiki>~~

{

~~description = "Bcachefs enabled installation media";~~

~~inputs.nixos.url = "nixpkgs/nixos-24.11";~~

~~outputs = { self, nixos }: {~~

~~nixosConfigurations = {~~

~~exampleIso = nixos.lib.nixosSystem {~~

~~system = "x86_64-linux";~~

~~modules = [~~

~~"${nixos}/nixos/modules/installer/cd-dvd/installation-cd-minimal-new-kernel-no-zfs.nix"~~

~~({ lib, pkgs, ... }: {~~

~~# Might be required as a workaround for bug~~

~~# https://github.com/NixOS/nixpkgs/issues/32279~~

~~environment.systemPackages = [ pkgs.keyutils ];~~

~~boot.supportedFilesystems = [ "bcachefs" ];~~

})

];

};

}

~~</nowiki>}}~~

~~The following commands will generate the iso-image which will be available in the directory <code>./result/iso</code>~~

~~<syntaxhighlight lang="console">~~

~~# nix build .#nixosConfigurations.exampleIso.config.system.build.isoImage~~

~~</syntaxhighlight>~~

=== NixOS installation on bcachefs ===

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# mkfs.fat -F 32 -n boot /dev/sda1

# nix shell -p bcachefs-tools

# mkfs.bcachefs -L nixos /dev/sda2

</syntaxhighlight>

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# nix-shell -p keyutils --run 'keyctl link @u @s'

# nix-shell -p bcachefs-tools

# bcachefs format --encrypted /dev/sda2

# bcachefs unlock /dev/sda2

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</syntaxhighlight>

And using it like <code>UUID=<UUID></code> in place of <code>/dev/sda1:/dev/sdb1</code> or even just <code>/dev/sda</code>.

Note: this is currently broken as per this [https://github.com/NixOS/nixpkgs/issues/317901 github issue]. As a workaround, use `/dev/disk/by-uuid/<UUID>` or `/dev/disk/by-id` instead. This seems to work for single device systems atleast, although atleast at the time of this writing I could not get it to work on my 4+ device raid system.

Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].

Before <code>nixos-install</code> you'll have to adapt the generated NixOS configuration to also use the latest Linux kernel supporting Bcachefs. Add the following line to the <code>configuration.nix</code> in your installation root (/mnt):

~~{{file|/mnt/etc/nixos/configuration.nix|nix|<nowiki>~~

~~boot.supportedFilesystems = [ "bcachefs" ];~~

~~boot.kernelPackages = pkgs.linuxPackages_latest;~~

~~</nowiki>}}~~

=== Remote encrypted disk unlocking ===

@@ Line 57: / Line 57: @@
      --label=hdd.hdd3 /dev/sde \
      --label=ssd.ssd1 /dev/sdf \
-     --label=ssd.ssd2 /dev/sdg
+     --label=ssd.ssd2 /dev/sdg \
      --foreground_target=ssd \
      --promote_target=ssd \
@@ Line 71: / Line 71: @@
      --label=hdd.hdd3 /dev/sde \
      --label=ssd.ssd1 /dev/sdf \
-     --label=ssd.ssd2 /dev/sdg
+     --label=ssd.ssd2 /dev/sdg \
      --foreground_target=ssd \
      --promote_target=ssd \
@@ Line 113: / Line 113: @@
 == Tips and tricks ==
-=== Generate bcachefs enabled installation media ===
-Use following Nix [[Flakes|Flake-expression]] to generate a ISO installation image with a bcachefs enabled kernel
-{{file|flake.nix|nix|<nowiki>
-{
-  description = "Bcachefs enabled installation media";
-  inputs.nixos.url = "nixpkgs/nixos-24.11";
-  outputs = { self, nixos }: {
-    nixosConfigurations = {
-      exampleIso = nixos.lib.nixosSystem {
-        system = "x86_64-linux";
-        modules = [
-          "${nixos}/nixos/modules/installer/cd-dvd/installation-cd-minimal-new-kernel-no-zfs.nix"
-          ({ lib, pkgs, ... }: {
-            # Might be required as a workaround for bug
-            # https://github.com/NixOS/nixpkgs/issues/32279
-            environment.systemPackages = [ pkgs.keyutils ];
-            boot.supportedFilesystems = [ "bcachefs" ];
-          })
-        ];
-      };
-    };
-  };
-}
-</nowiki>}}
-The following commands will generate the iso-image which will be available in the directory <code>./result/iso</code>
-<syntaxhighlight lang="console">
-# nix build .#nixosConfigurations.exampleIso.config.system.build.isoImage
-</syntaxhighlight>
 === NixOS installation on bcachefs ===
@@ Line 166: / Line 133: @@
 <syntaxhighlight lang="console">
 # mkfs.fat -F 32 -n boot /dev/sda1
+# nix shell -p bcachefs-tools
 # mkfs.bcachefs -L nixos /dev/sda2
 </syntaxhighlight>
@@ Line 173: / Line 141: @@
 <syntaxhighlight lang="console">
 # nix-shell -p keyutils --run 'keyctl link @u @s'
+# nix-shell -p bcachefs-tools
 # bcachefs format --encrypted /dev/sda2
 # bcachefs unlock /dev/sda2
@@ Line 193: / Line 162: @@
 </syntaxhighlight>
 And using it like <code>UUID=<UUID></code> in place of <code>/dev/sda1:/dev/sdb1</code> or even just <code>/dev/sda</code>.
-Note: this is currently broken as per this [https://github.com/NixOS/nixpkgs/issues/317901 github issue]. As a workaround, use `/dev/disk/by-uuid/<UUID>` or `/dev/disk/by-id` instead. This seems to work for single device systems atleast, although atleast at the time of this writing I could not get it to work on my 4+ device raid system.
 Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].
-Before <code>nixos-install</code> you'll have to adapt the generated NixOS configuration to also use the latest Linux kernel supporting Bcachefs. Add the following line to the <code>configuration.nix</code> in your installation root (/mnt):
-{{file|/mnt/etc/nixos/configuration.nix|nix|<nowiki>
-boot.supportedFilesystems = [ "bcachefs" ];
-boot.kernelPackages = pkgs.linuxPackages_latest;
-</nowiki>}}
 === Remote encrypted disk unlocking ===