nixpkgs/nixos/modules/services/network-filesystems/drbd.nix

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# Support for DRBD, the Distributed Replicated Block Device.
{ config, lib, pkgs, ... }:
with lib;
let cfg = config.services.drbd; in
{
###### interface
options = {
services.drbd.enable = mkOption {
default = false;
type = types.bool;
description = ''
Whether to enable support for DRBD, the Distributed Replicated
Block Device.
'';
};
services.drbd.config = mkOption {
default = "";
type = types.string;
description = ''
Contents of the <filename>drbd.conf</filename> configuration file.
'';
};
};
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###### implementation
config = mkIf cfg.enable {
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environment.systemPackages = [ pkgs.drbd ];
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services.udev.packages = [ pkgs.drbd ];
boot.kernelModules = [ "drbd" ];
boot.extraModprobeConfig =
''
options drbd usermode_helper=/run/current-system/sw/bin/drbdadm
'';
environment.etc = singleton
{ source = pkgs.writeText "drbd.conf" cfg.config;
target = "drbd.conf";
};
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systemd.services.drbd = {
after = [ "systemd-udev.settle.service" ];
wants = [ "systemd-udev.settle.service" ];
wantedBy = [ "ip-up.target" ];
script = ''
${pkgs.drbd}/sbin/drbdadm up all
'';
serviceConfig.ExecStop = ''
${pkgs.drbd}/sbin/drbdadm down all
'';
};
};
}