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Reduce memory requirements to 1GB

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Jörg Thalheim 2024-05-19 16:41:44 +02:00 committed by mergify[bot]
parent 7d48cb7843
commit 2c54ebe7b8
2 changed files with 4 additions and 2 deletions
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2
README.md
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@ -11,7 +11,7 @@ Kexec is a mechanism in Linux to load a new kernel from a running Linux to
replace the current kernel. This is useful for booting the Nixos installer from replace the current kernel. This is useful for booting the Nixos installer from
existing Linux distributions, such as server provider that do not offer a NixOS existing Linux distributions, such as server provider that do not offer a NixOS
option. After running kexec, the NixOS installer exists only in memory. At the option. After running kexec, the NixOS installer exists only in memory. At the
time of writing, this requires at least 1.5GB of physical RAM (swap does not time of writing, this requires at least 1GB of physical RAM (swap does not
count) in the system. If not enough RAM is available, the initrd cannot be count) in the system. If not enough RAM is available, the initrd cannot be
loaded. Because the NixOS runs only in RAM, users can reformat all the system's loaded. Because the NixOS runs only in RAM, users can reformat all the system's
discs to prepare for a new NixOS installation. discs to prepare for a new NixOS installation.

4
nix/kexec-installer/test.nix
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@ -1,4 +1,5 @@
{ pkgs { pkgs
, lib
, kexecTarball , kexecTarball
}: }:
@ -24,7 +25,8 @@ makeTest' {
]; ];
system.extraDependencies = [ kexecTarball ]; system.extraDependencies = [ kexecTarball ];
virtualisation.memorySize = 1 * 1024 + 256; # TODO: remove the conditional after 23.11 is end-of-life
virtualisation.memorySize = 1 * 1024 + (if (lib.versionOlder lib.version "24.05pre") then 256 else 0);
virtualisation.diskSize = 4 * 1024; virtualisation.diskSize = 4 * 1024;
virtualisation.forwardPorts = [{ virtualisation.forwardPorts = [{
host.port = 2222; host.port = 2222;