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