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6dfbef0ae2
The module would fail to evaluate: ```The option value `boot.crashDump.kernelPackages' in ... is not a package.``` Removed the option boot.crashDump.kernelPackage in favor of using boot.kernelPatches which automatically chooses the same kernel version as boot.kernelPackage instead of overriding it. Added option boot.crashDump.reservedMemory to customized crash kernel memory. Changed the default of boot.crashDump.kernelParams as the current one seemed to have no effect.
77 lines
2.1 KiB
Nix
77 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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crashdump = config.boot.crashDump;
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kernelParams = concatStringsSep " " crashdump.kernelParams;
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in
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###### interface
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{
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options = {
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boot = {
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crashDump = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, NixOS will set up a kernel that will
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boot on crash, and leave the user in systemd rescue
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to be able to save the crashed kernel dump at
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/proc/vmcore.
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It also activates the NMI watchdog.
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'';
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};
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reservedMemory = mkOption {
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default = "128M";
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description = ''
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The amount of memory reserved for the crashdump kernel.
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If you choose a too high value, dmesg will mention
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"crashkernel reservation failed".
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'';
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};
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kernelParams = mkOption {
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type = types.listOf types.str;
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default = [ "1" "boot.shell_on_fail" ];
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description = ''
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Parameters that will be passed to the kernel kexec-ed on crash.
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'';
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};
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};
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};
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};
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###### implementation
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config = mkIf crashdump.enable {
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boot = {
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postBootCommands = ''
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echo "loading crashdump kernel...";
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${pkgs.kexectools}/sbin/kexec -p /run/current-system/kernel \
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--initrd=/run/current-system/initrd \
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--reset-vga --console-vga \
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--command-line="systemConfig=$(readlink -f /run/current-system) init=$(readlink -f /run/current-system/init) irqpoll maxcpus=1 reset_devices ${kernelParams}"
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'';
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kernelParams = [
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"crashkernel=${crashdump.reservedMemory}"
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"nmi_watchdog=panic"
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"softlockup_panic=1"
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"idle=poll"
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];
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kernelPatches = [ {
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name = "crashdump-config";
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patch = null;
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extraConfig = ''
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CRASH_DUMP y
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DEBUG_INFO y
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PROC_VMCORE y
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LOCKUP_DETECTOR y
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HARDLOCKUP_DETECTOR y
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'';
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} ];
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};
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};
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}
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