70 lines
1.8 KiB
Nix
70 lines
1.8 KiB
Nix
{
|
|
config,
|
|
lib,
|
|
pkgs,
|
|
...
|
|
}:
|
|
let
|
|
crashdump = config.boot.crashDump;
|
|
|
|
kernelParams = lib.concatStringsSep " " crashdump.kernelParams;
|
|
|
|
in
|
|
###### interface
|
|
{
|
|
options = {
|
|
boot = {
|
|
crashDump = {
|
|
enable = lib.mkOption {
|
|
type = lib.types.bool;
|
|
default = false;
|
|
description = ''
|
|
If enabled, NixOS will set up a kernel that will
|
|
boot on crash, and leave the user in systemd rescue
|
|
to be able to save the crashed kernel dump at
|
|
/proc/vmcore.
|
|
It also activates the NMI watchdog.
|
|
'';
|
|
};
|
|
reservedMemory = lib.mkOption {
|
|
default = "128M";
|
|
type = lib.types.str;
|
|
description = ''
|
|
The amount of memory reserved for the crashdump kernel.
|
|
If you choose a too high value, dmesg will mention
|
|
"crashkernel reservation failed".
|
|
'';
|
|
};
|
|
kernelParams = lib.mkOption {
|
|
type = lib.types.listOf lib.types.str;
|
|
default = [
|
|
"1"
|
|
"boot.shell_on_fail"
|
|
];
|
|
description = ''
|
|
Parameters that will be passed to the kernel kexec-ed on crash.
|
|
'';
|
|
};
|
|
};
|
|
};
|
|
};
|
|
|
|
###### implementation
|
|
|
|
config = lib.mkIf crashdump.enable {
|
|
boot = {
|
|
postBootCommands = ''
|
|
echo "loading crashdump kernel...";
|
|
${pkgs.kexec-tools}/sbin/kexec -p /run/current-system/kernel \
|
|
--initrd=/run/current-system/initrd \
|
|
--reset-vga --console-vga \
|
|
--command-line="init=$(readlink -f /run/current-system/init) irqpoll maxcpus=1 reset_devices ${kernelParams}"
|
|
'';
|
|
kernelParams = [
|
|
"crashkernel=${crashdump.reservedMemory}"
|
|
"nmi_watchdog=panic"
|
|
"softlockup_panic=1"
|
|
];
|
|
};
|
|
};
|
|
}
|