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|
# Systemd services for lxd.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.virtualisation.lxd;
zfsCfg = config.boot.zfs;
in
{
###### interface
options = {
virtualisation.lxd = {
enable = mkOption {
type = types.bool;
default = false;
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.
Most of the time, you'll also want to start lxcfs, so
that containers can "see" the limits:
<code>
virtualisation.lxc.lxcfs.enable = true;
</code>
'';
};
package = mkOption {
type = types.package;
default = pkgs.lxd.override { nftablesSupport = config.networking.nftables.enable; };
defaultText = "pkgs.lxd";
description = ''
The LXD package to use.
'';
};
lxcPackage = mkOption {
type = types.package;
default = pkgs.lxc;
defaultText = "pkgs.lxc";
description = ''
The LXC package to use with LXD (required for AppArmor profiles).
'';
};
zfsPackage = mkOption {
type = types.package;
default = with pkgs; if zfsCfg.enableUnstable then zfsUnstable else zfs;
defaultText = "pkgs.zfs";
description = ''
The ZFS package to use with LXD.
'';
};
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.
'';
};
recommendedSysctlSettings = mkOption {
type = types.bool;
default = false;
description = ''
enables various settings to avoid common pitfalls when
running containers requiring many file operations.
Fixes errors like "Too many open files" or
"neighbour: ndisc_cache: neighbor table overflow!".
See https://lxd.readthedocs.io/en/latest/production-setup/
for details.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ cfg.package ];
security.apparmor = {
enable = true;
profiles = [
"${cfg.lxcPackage}/etc/apparmor.d/usr.bin.lxc-start"
"${cfg.lxcPackage}/etc/apparmor.d/lxc-containers"
];
packages = [ cfg.lxcPackage ];
};
systemd.services.lxd = {
description = "LXD Container Management Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "systemd-udev-settle.service" ];
path = lib.optional cfg.zfsSupport cfg.zfsPackage;
preStart = ''
mkdir -m 0755 -p /var/lib/lxc/rootfs
'';
serviceConfig = {
ExecStart = "@${cfg.package}/bin/lxd lxd --group lxd";
Type = "simple";
KillMode = "process"; # when stopping, leave the containers alone
LimitMEMLOCK = "infinity";
LimitNOFILE = "1048576";
LimitNPROC = "infinity";
TasksMax = "infinity";
# By default, `lxd` loads configuration files from hard-coded
# `/usr/share/lxc/config` - since this is a no-go for us, we have to
# explicitly tell it where the actual configuration files are
Environment = mkIf (config.virtualisation.lxc.lxcfs.enable)
"LXD_LXC_TEMPLATE_CONFIG=${pkgs.lxcfs}/share/lxc/config";
};
};
users.groups.lxd.gid = config.ids.gids.lxd;
users.users.root = {
subUidRanges = [ { startUid = 1000000; count = 65536; } ];
subGidRanges = [ { startGid = 1000000; count = 65536; } ];
};
boot.kernel.sysctl = mkIf cfg.recommendedSysctlSettings {
"fs.inotify.max_queued_events" = 1048576;
"fs.inotify.max_user_instances" = 1048576;
"fs.inotify.max_user_watches" = 1048576;
"vm.max_map_count" = 262144;
"kernel.dmesg_restrict" = 1;
"net.ipv4.neigh.default.gc_thresh3" = 8192;
"net.ipv6.neigh.default.gc_thresh3" = 8192;
"kernel.keys.maxkeys" = 2000;
};
};
}
|