101 lines
2.9 KiB
Nix
101 lines
2.9 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.virtualisation.docker.rootless;
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proxy_env = config.networking.proxy.envVars;
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settingsFormat = pkgs.formats.json {};
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daemonSettingsFile = settingsFormat.generate "daemon.json" cfg.daemon.settings;
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in
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{
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###### interface
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options.virtualisation.docker.rootless = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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This option enables docker in a rootless mode, a daemon that manages
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linux containers. To interact with the daemon, one needs to set
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{command}`DOCKER_HOST=unix://$XDG_RUNTIME_DIR/docker.sock`.
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'';
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};
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setSocketVariable = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Point {command}`DOCKER_HOST` to rootless Docker instance for
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normal users by default.
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'';
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};
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daemon.settings = mkOption {
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type = settingsFormat.type;
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default = { };
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example = {
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ipv6 = true;
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"fixed-cidr-v6" = "fd00::/80";
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};
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description = lib.mdDoc ''
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Configuration for docker daemon. The attributes are serialized to JSON used as daemon.conf.
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See https://docs.docker.com/engine/reference/commandline/dockerd/#daemon-configuration-file
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'';
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};
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package = mkOption {
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default = pkgs.docker;
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defaultText = literalExpression "pkgs.docker";
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type = types.package;
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description = lib.mdDoc ''
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Docker package to be used in the module.
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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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environment.extraInit = optionalString cfg.setSocketVariable ''
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if [ -z "$DOCKER_HOST" -a -n "$XDG_RUNTIME_DIR" ]; then
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export DOCKER_HOST="unix://$XDG_RUNTIME_DIR/docker.sock"
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fi
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'';
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# Taken from https://github.com/moby/moby/blob/master/contrib/dockerd-rootless-setuptool.sh
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systemd.user.services.docker = {
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wantedBy = [ "default.target" ];
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description = "Docker Application Container Engine (Rootless)";
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# needs newuidmap from pkgs.shadow
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path = [ "/run/wrappers" ];
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environment = proxy_env;
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unitConfig = {
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# docker-rootless doesn't support running as root.
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ConditionUser = "!root";
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StartLimitInterval = "60s";
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};
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serviceConfig = {
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Type = "notify";
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ExecStart = "${cfg.package}/bin/dockerd-rootless --config-file=${daemonSettingsFile}";
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ExecReload = "${pkgs.procps}/bin/kill -s HUP $MAINPID";
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TimeoutSec = 0;
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RestartSec = 2;
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Restart = "always";
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StartLimitBurst = 3;
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LimitNOFILE = "infinity";
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LimitNPROC = "infinity";
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LimitCORE = "infinity";
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Delegate = true;
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NotifyAccess = "all";
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KillMode = "mixed";
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};
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};
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};
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}
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