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|
# Systemd services for docker.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.virtualisation.docker;
proxy_env = config.networking.proxy.envVars;
in
{
###### interface
options.virtualisation.docker = {
enable =
mkOption {
type = types.bool;
default = false;
description =
''
This option enables docker, a daemon that manages
linux containers. Users in the "docker" group can interact with
the daemon (e.g. to start or stop containers) using the
<command>docker</command> command line tool.
'';
};
listenOptions =
mkOption {
type = types.listOf types.str;
default = ["/run/docker.sock"];
description =
''
A list of unix and tcp docker should listen to. The format follows
ListenStream as described in systemd.socket(5).
'';
};
enableOnBoot =
mkOption {
type = types.bool;
default = true;
description =
''
When enabled dockerd is started on boot. This is required for
containers which are created with the
<literal>--restart=always</literal> flag to work. If this option is
disabled, docker might be started on demand by socket activation.
'';
};
enableNvidia =
mkOption {
type = types.bool;
default = false;
description = ''
Enable nvidia-docker wrapper, supporting NVIDIA GPUs inside docker containers.
'';
};
liveRestore =
mkOption {
type = types.bool;
default = true;
description =
''
Allow dockerd to be restarted without affecting running container.
This option is incompatible with docker swarm.
'';
};
storageDriver =
mkOption {
type = types.nullOr (types.enum ["aufs" "btrfs" "devicemapper" "overlay" "overlay2" "zfs"]);
default = null;
description =
''
This option determines which Docker storage driver to use. By default
it let's docker automatically choose preferred storage driver.
'';
};
logDriver =
mkOption {
type = types.enum ["none" "json-file" "syslog" "journald" "gelf" "fluentd" "awslogs" "splunk" "etwlogs" "gcplogs"];
default = "journald";
description =
''
This option determines which Docker log driver to use.
'';
};
extraOptions =
mkOption {
type = types.separatedString " ";
default = "";
description =
''
The extra command-line options to pass to
<command>docker</command> daemon.
'';
};
autoPrune = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to periodically prune Docker resources. If enabled, a
systemd timer will run <literal>docker system prune -f</literal>
as specified by the <literal>dates</literal> option.
'';
};
flags = mkOption {
type = types.listOf types.str;
default = [];
example = [ "--all" ];
description = ''
Any additional flags passed to <command>docker system prune</command>.
'';
};
dates = mkOption {
default = "weekly";
type = types.str;
description = ''
Specification (in the format described by
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>) of the time at
which the prune will occur.
'';
};
};
package = mkOption {
default = pkgs.docker;
type = types.package;
example = pkgs.docker-edge;
description = ''
Docker package to be used in the module.
'';
};
};
###### implementation
config = mkIf cfg.enable (mkMerge [{
boot.kernelModules = [ "bridge" "veth" ];
environment.systemPackages = [ cfg.package ]
++ optional cfg.enableNvidia pkgs.nvidia-docker;
users.groups.docker.gid = config.ids.gids.docker;
systemd.packages = [ cfg.package ];
systemd.services.docker = {
wantedBy = optional cfg.enableOnBoot "multi-user.target";
environment = proxy_env;
serviceConfig = {
ExecStart = [
""
''
${cfg.package}/bin/dockerd \
--group=docker \
--host=fd:// \
--log-driver=${cfg.logDriver} \
${optionalString (cfg.storageDriver != null) "--storage-driver=${cfg.storageDriver}"} \
${optionalString cfg.liveRestore "--live-restore" } \
${optionalString cfg.enableNvidia "--add-runtime nvidia=${pkgs.nvidia-docker}/bin/nvidia-container-runtime" } \
${cfg.extraOptions}
''];
ExecReload=[
""
"${pkgs.procps}/bin/kill -s HUP $MAINPID"
];
};
path = [ pkgs.kmod ] ++ optional (cfg.storageDriver == "zfs") pkgs.zfs
++ optional cfg.enableNvidia pkgs.nvidia-docker;
};
systemd.sockets.docker = {
description = "Docker Socket for the API";
wantedBy = [ "sockets.target" ];
socketConfig = {
ListenStream = cfg.listenOptions;
SocketMode = "0660";
SocketUser = "root";
SocketGroup = "docker";
};
};
systemd.services.docker-prune = {
description = "Prune docker resources";
restartIfChanged = false;
unitConfig.X-StopOnRemoval = false;
serviceConfig.Type = "oneshot";
script = ''
${cfg.package}/bin/docker system prune -f ${toString cfg.autoPrune.flags}
'';
startAt = optional cfg.autoPrune.enable cfg.autoPrune.dates;
};
assertions = [
{ assertion = cfg.enableNvidia -> config.hardware.opengl.driSupport32Bit or false;
message = "Option enableNvidia requires 32bit support libraries";
}];
}
(mkIf cfg.enableNvidia {
environment.etc."nvidia-container-runtime/config.toml".source = "${pkgs.nvidia-docker}/etc/config.toml";
})
]);
imports = [
(mkRemovedOptionModule ["virtualisation" "docker" "socketActivation"] "This option was removed in favor of starting docker at boot")
];
}
|
