119 lines
4.2 KiB
Nix
119 lines
4.2 KiB
Nix
{ config, lib, pkgs, ... }: let
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cfg = config.lass.drbd;
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slib = import <stockholm/lib>;
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in {
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options = {
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lass.drbd = lib.mkOption {
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default = {};
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type = lib.types.attrsOf (lib.types.submodule ({ config, ... }: {
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options = {
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name = lib.mkOption {
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type = lib.types.str;
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default = config._module.args.name;
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};
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blockMinor = lib.mkOption {
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type = lib.types.int;
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default = lib.mod (slib.genid config.name) 16000; # TODO get max_id fron drbd
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};
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port = lib.mkOption {
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type = lib.types.int;
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default = 20000 + config.blockMinor;
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};
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peers = lib.mkOption {
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type = lib.types.listOf slib.types.host;
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};
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disk = lib.mkOption {
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type = lib.types.str;
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default = "/dev/loop${toString config.blockMinor}";
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};
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drbdConfig = lib.mkOption {
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type = lib.types.path;
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internal = true;
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default = pkgs.writeText "drbd-${config.name}.conf" ''
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resource ${config.name} {
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net {
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protocol a;
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ping-int 10;
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}
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device minor ${toString config.blockMinor};
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disk ${config.disk};
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meta-disk internal;
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${slib.indent (lib.concatStrings (lib.imap1 (i: peer: /* shell */ ''
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on ${peer.name} {
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address ${peer.nets.retiolum.ip4.addr}:${toString config.port};
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node-id ${toString i};
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}
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'') config.peers))}
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connection-mesh {
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hosts ${lib.concatMapStringsSep " " (peer: peer.name) config.peers};
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}
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}
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'';
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};
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};
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}));
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};
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};
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config = lib.mkIf (cfg != {}) {
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boot.extraModulePackages = [
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(pkgs.linuxPackages.callPackage ../5pkgs/drbd9/default.nix {})
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];
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boot.extraModprobeConfig = ''
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options drbd usermode_helper=/run/current-system/sw/bin/drbdadm
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'';
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services.udev.packages = [ pkgs.drbd ];
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boot.kernelModules = [ "drbd" ];
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environment.systemPackages = [ pkgs.drbd ];
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networking.firewall.allowedTCPPorts = map (device: device.port) (lib.attrValues cfg);
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systemd.services = lib.mapAttrs' (_: device:
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lib.nameValuePair "drbd-${device.name}" {
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after = [ "systemd-udev.settle.service" "network.target" ];
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wants = [ "systemd-udev.settle.service" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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RemainAfterExit = true;
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ExecStart = pkgs.writers.writeDash "start-drbd-${device.name}" ''
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set -efux
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mkdir -p /var/lib/sync-containers2
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${lib.optionalString (device.disk == "/dev/loop${toString device.blockMinor}") ''
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if ! test -e /var/lib/sync-containers2/${device.name}.disk; then
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truncate -s 10G /var/lib/sync-containers2/${device.name}.disk
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fi
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if ! ${pkgs.util-linux}/bin/losetup /dev/loop${toString device.blockMinor}; then
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${pkgs.util-linux}/bin/losetup /dev/loop${toString device.blockMinor} /var/lib/sync-containers2/${device.name}.disk
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fi
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''}
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if ! ${pkgs.drbd}/bin/drbdadm adjust ${device.name}; then
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${pkgs.drbd}/bin/drbdadm down ${device.name}
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${pkgs.drbd}/bin/drbdadm create-md ${device.name}
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${pkgs.drbd}/bin/drbdadm up ${device.name}
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fi
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'';
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ExecStop = pkgs.writers.writeDash "stop-drbd-${device.name}" ''
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set -efux
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${pkgs.drbd}/bin/drbdadm -c ${device.drbdConfig} down ${device.name}
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${lib.optionalString (device.disk == "/dev/loop${toString device.blockMinor}") ''
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${pkgs.util-linux}/bin/losetup -d /dev/loop${toString device.blockMinor}
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''}
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'';
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};
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}
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) cfg;
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environment.etc."drbd.conf".text = ''
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global {
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usage-count yes;
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}
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${lib.concatMapStrings (device: /* shell */ ''
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include ${device.drbdConfig};
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'') (lib.attrValues cfg)}
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'';
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};
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}
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