147 lines
4 KiB
Nix
147 lines
4 KiB
Nix
# Systemd services for docker.
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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.docker;
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proxy_env = config.networking.proxy.envVars;
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in
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{
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###### interface
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options.virtualisation.docker = {
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enable =
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mkOption {
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type = types.bool;
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default = false;
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description =
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''
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This option enables docker, a daemon that manages
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linux containers. Users in the "docker" group can interact with
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the daemon (e.g. to start or stop containers) using the
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<command>docker</command> command line tool.
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'';
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};
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listenOptions =
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mkOption {
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type = types.listOf types.str;
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default = ["/var/run/docker.sock"];
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description =
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''
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A list of unix and tcp docker should listen to. The format follows
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ListenStream as described in systemd.socket(5).
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'';
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};
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enableOnBoot =
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mkOption {
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type = types.bool;
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default = true;
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description =
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''
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When enabled dockerd is started on boot. This is required for
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container, which are created with the
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<literal>--restart=always</literal> flag, to work. If this option is
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disabled, docker might be started on demand by socket activation.
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'';
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};
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liveRestore =
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mkOption {
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type = types.bool;
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default = true;
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description =
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''
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Allow dockerd to be restarted without affecting running container.
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This option is incompatible with docker swarm.
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'';
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};
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storageDriver =
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mkOption {
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type = types.nullOr (types.enum ["aufs" "btrfs" "devicemapper" "overlay" "overlay2" "zfs"]);
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default = null;
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description =
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''
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This option determines which Docker storage driver to use. By default
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it let's docker automatically choose preferred storage driver.
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'';
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};
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logDriver =
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mkOption {
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type = types.enum ["none" "json-file" "syslog" "journald" "gelf" "fluentd" "awslogs" "splunk" "etwlogs" "gcplogs"];
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default = "journald";
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description =
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''
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This option determines which Docker log driver to use.
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'';
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};
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extraOptions =
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mkOption {
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type = types.separatedString " ";
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default = "";
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description =
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''
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The extra command-line options to pass to
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<command>docker</command> daemon.
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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 (mkMerge [{
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environment.systemPackages = [ pkgs.docker ];
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users.extraGroups.docker.gid = config.ids.gids.docker;
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systemd.packages = [ pkgs.docker ];
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systemd.services.docker = {
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wantedBy = optional cfg.enableOnBoot "multi-user.target";
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environment = proxy_env;
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serviceConfig = {
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ExecStart = [
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""
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''
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${pkgs.docker}/bin/dockerd \
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--group=docker \
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--host=fd:// \
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--log-driver=${cfg.logDriver} \
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${optionalString (cfg.storageDriver != null) "--storage-driver=${cfg.storageDriver}"} \
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${optionalString cfg.liveRestore "--live-restore" } \
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${cfg.extraOptions}
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''];
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ExecReload=[
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""
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"${pkgs.procps}/bin/kill -s HUP $MAINPID"
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];
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};
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path = [ pkgs.kmod ] ++ (optional (cfg.storageDriver == "zfs") pkgs.zfs);
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};
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systemd.sockets.docker = {
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description = "Docker Socket for the API";
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wantedBy = [ "sockets.target" ];
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socketConfig = {
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ListenStream = cfg.listenOptions;
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SocketMode = "0660";
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SocketUser = "root";
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SocketGroup = "docker";
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};
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};
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}
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]);
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imports = [
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(mkRemovedOptionModule ["virtualisation" "docker" "socketActivation"] "This option was removed in favor of starting docker at boot")
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];
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}
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