nixpkgs/nixos/modules/virtualisation/lxd.nix

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# Systemd services for lxd.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.virtualisation.lxd;
in
{
###### interface
options = {
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virtualisation.lxd = {
enable = mkOption {
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type = types.bool;
default = false;
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description = ''
This option enables lxd, a daemon that manages
containers. Users in the "lxd" group can interact with
the daemon (e.g. to start or stop containers) using the
<command>lxc</command> command line tool, among others.
'';
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};
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zfsSupport = mkOption {
type = types.bool;
default = false;
description = ''
enables lxd to use zfs as a storage for containers.
This option is enabled by default if a zfs pool is configured
with nixos.
'';
};
};
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};
###### implementation
config = mkIf cfg.enable {
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environment.systemPackages = [ pkgs.lxd ];
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security.apparmor = {
enable = true;
profiles = [
"${pkgs.lxc}/etc/apparmor.d/usr.bin.lxc-start"
"${pkgs.lxc}/etc/apparmor.d/lxc-containers"
];
packages = [ pkgs.lxc ];
};
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systemd.services.lxd = {
description = "LXD Container Management Daemon";
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wantedBy = [ "multi-user.target" ];
after = [ "systemd-udev-settle.service" ];
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path = lib.optional cfg.zfsSupport pkgs.zfs;
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preStart = ''
mkdir -m 0755 -p /var/lib/lxc/rootfs
'';
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serviceConfig = {
ExecStart = "@${pkgs.lxd.bin}/bin/lxd lxd --group lxd";
Type = "simple";
KillMode = "process"; # when stopping, leave the containers alone
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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; } ];
subGidRanges = [ { startGid = 1000000; count = 65536; } ];
};
};
}