diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 610c2a2b758a..a55c2c4565e2 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -528,6 +528,7 @@
./services/system/cgmanager.nix
./services/system/cloud-init.nix
./services/system/dbus.nix
+ ./services/system/earlyoom.nix
./services/system/kerberos.nix
./services/system/nscd.nix
./services/system/uptimed.nix
diff --git a/nixos/modules/services/system/earlyoom.nix b/nixos/modules/services/system/earlyoom.nix
new file mode 100644
index 000000000000..daa46838bfa8
--- /dev/null
+++ b/nixos/modules/services/system/earlyoom.nix
@@ -0,0 +1,96 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+ ecfg = config.services.earlyoom;
+in
+{
+ options = {
+ services.earlyoom = {
+
+ enable = mkOption {
+ type = types.bool;
+ default = false;
+ description = ''
+ Enable early out of memory killing.
+ '';
+ };
+
+ freeMemThreshold = mkOption {
+ type = types.int;
+ default = 10;
+ description = ''
+ Minimum of availabe memory (in percent).
+ If the free memory falls below this threshold and the analog is true for
+
+ the killing begins.
+ '';
+ };
+
+ freeSwapThreshold = mkOption {
+ type = types.int;
+ default = 10;
+ description = ''
+ Minimum of availabe swap space (in percent).
+ If the available swap space falls below this threshold and the analog
+ is true for
+ the killing begins.
+ '';
+ };
+
+ useKernelOOMKiller= mkOption {
+ type = types.bool;
+ default = false;
+ description = ''
+ Use kernel OOM killer instead of own user-space implementation.
+ '';
+ };
+
+ ignoreOOMScoreAdjust = mkOption {
+ type = types.bool;
+ default = false;
+ description = ''
+ Ignore oom_score_adjust values of processes.
+ User-space implementation only.
+ '';
+ };
+
+ enableDebugInfo = mkOption {
+ type = types.bool;
+ default = false;
+ description = ''
+ Enable debugging messages.
+ '';
+ };
+ };
+ };
+
+ config = mkIf ecfg.enable {
+ assertions = [
+ { assertion = ecfg.freeMemThreshold > 0 && ecfg.freeMemThreshold <= 100;
+ message = "Needs to be a positive percentage"; }
+ { assertion = ecfg.freeSwapThreshold > 0 && ecfg.freeSwapThreshold <= 100;
+ message = "Needs to be a positive percentage"; }
+ { assertion = !ecfg.useKernelOOMKiller || !ecfg.ignoreOOMScoreAdjust;
+ message = "Both options in conjunction do not make sense"; }
+ ];
+
+ systemd.services.earlyoom = {
+ description = "Early OOM Daemon for Linux";
+ wantedBy = [ "multi-user.target" ];
+ serviceConfig = {
+ StandardOutput = "null";
+ StandardError = "syslog";
+ ExecStart = ''
+ ${pkgs.earlyoom}/bin/earlyoom \
+ -m ${toString ecfg.freeMemThreshold} \
+ -s ${toString ecfg.freeSwapThreshold} \
+ ${optionalString ecfg.useKernelOOMKiller "-k"} \
+ ${optionalString ecfg.ignoreOOMScoreAdjust "-i"} \
+ ${optionalString ecfg.enableDebugInfo "-d"}
+ '';
+ };
+ };
+ };
+}