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reduce minimum RAM requirements

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This commit is contained in:
Jörg Thalheim 2023-05-07 21:44:20 +02:00
parent e855c9b4b9
commit 340303d82b
2 changed files with 4 additions and 4 deletions
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6
README.md
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@ -14,7 +14,7 @@ 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 2.5GB of physical RAM (swap does not time of writing, this requires at least 1.5GB 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.
@ -22,7 +22,7 @@ discs to prepare for a new NixOS installation.
It can be booted as follows by running these commands as root: It can be booted as follows by running these commands as root:
``` ```
curl -L https://github.com/nix-community/nixos-images/releases/download/nixos-unstable/nixos-kexec-installer-x86_64-linux.tar.gz | tar -xzf- -C /root curl -L https://github.com/nix-community/nixos-images/releases/download/nixos-unstable/nixos-kexec-installer-noninteractive-x86_64-linux.tar.gz | tar -xzf- -C /root
/root/kexec/run /root/kexec/run
``` ```
@ -37,5 +37,5 @@ The kexec installer comes with the following features:
The actual kexec happens with a slight delay (6s). This allows for easier The actual kexec happens with a slight delay (6s). This allows for easier
integration into automated nixos installation scripts, since you can cleanly integration into automated nixos installation scripts, since you can cleanly
disconnect from the running machine before the kexec takes place. The tarball disconnect from the running machine before the kexec takes place. The tarball
is also designed to be run from NixOS, which can be useful for new installations is also designed to be run from NixOS, which can be useful for new installations

2
nix/kexec-installer/test.nix
View file

@ -21,7 +21,7 @@ in makeTest' {
(modulesPath + "/profiles/minimal.nix") (modulesPath + "/profiles/minimal.nix")
]; ];
virtualisation.memorySize = 2048; virtualisation.memorySize = 1024 + 512;
virtualisation.diskSize = 4 * 1024; virtualisation.diskSize = 4 * 1024;
virtualisation.useBootLoader = true; virtualisation.useBootLoader = true;
virtualisation.useEFIBoot = true; virtualisation.useEFIBoot = true;