140 lines
3.6 KiB
Nix
140 lines
3.6 KiB
Nix
# Systemd services for lxd.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.virtualisation.lxd;
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zfsCfg = config.boot.zfs;
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in
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{
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###### interface
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options = {
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virtualisation.lxd = {
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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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This option enables lxd, a daemon that manages
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containers. Users in the "lxd" group can interact with
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the daemon (e.g. to start or stop containers) using the
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<command>lxc</command> command line tool, among others.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.lxd;
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defaultText = "pkgs.lxd";
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description = ''
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The LXD package to use.
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'';
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};
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lxcPackage = mkOption {
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type = types.package;
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default = pkgs.lxc;
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defaultText = "pkgs.lxc";
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description = ''
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The LXC package to use with LXD (required for AppArmor profiles).
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'';
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};
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zfsPackage = mkOption {
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type = types.package;
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default = with pkgs; if zfsCfg.enableUnstable then zfsUnstable else zfs;
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defaultText = "pkgs.zfs";
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description = ''
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The ZFS package to use with LXD.
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'';
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};
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zfsSupport = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enables lxd to use zfs as a storage for containers.
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This option is enabled by default if a zfs pool is configured
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with nixos.
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'';
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};
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recommendedSysctlSettings = mkOption {
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type = types.bool;
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default = false;
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description = ''
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enables various settings to avoid common pitfalls when
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running containers requiring many file operations.
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Fixes errors like "Too many open files" or
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"neighbour: ndisc_cache: neighbor table overflow!".
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See https://lxd.readthedocs.io/en/latest/production-setup/
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for details.
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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 cfg.enable {
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environment.systemPackages = [ cfg.package ];
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security.apparmor = {
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enable = true;
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profiles = [
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"${cfg.lxcPackage}/etc/apparmor.d/usr.bin.lxc-start"
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"${cfg.lxcPackage}/etc/apparmor.d/lxc-containers"
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];
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packages = [ cfg.lxcPackage ];
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};
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systemd.services.lxd = {
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description = "LXD Container Management Daemon";
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wantedBy = [ "multi-user.target" ];
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after = [ "systemd-udev-settle.service" ];
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path = lib.optional cfg.zfsSupport cfg.zfsPackage;
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preStart = ''
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mkdir -m 0755 -p /var/lib/lxc/rootfs
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'';
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serviceConfig = {
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ExecStart = "@${cfg.package}/bin/lxd lxd --group lxd";
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Type = "simple";
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KillMode = "process"; # when stopping, leave the containers alone
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LimitMEMLOCK = "infinity";
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LimitNOFILE = "1048576";
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LimitNPROC = "infinity";
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TasksMax = "infinity";
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};
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};
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users.groups.lxd.gid = config.ids.gids.lxd;
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users.users.root = {
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subUidRanges = [ { startUid = 1000000; count = 65536; } ];
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subGidRanges = [ { startGid = 1000000; count = 65536; } ];
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};
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boot.kernel.sysctl = mkIf cfg.recommendedSysctlSettings {
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"fs.inotify.max_queued_events" = 1048576;
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"fs.inotify.max_user_instances" = 1048576;
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"fs.inotify.max_user_watches" = 1048576;
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"vm.max_map_count" = 262144;
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"kernel.dmesg_restrict" = 1;
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"net.ipv4.neigh.default.gc_thresh3" = 8192;
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"net.ipv6.neigh.default.gc_thresh3" = 8192;
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"kernel.keys.maxkeys" = 2000;
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};
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};
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}
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