111 lines
3.4 KiB
Nix
111 lines
3.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.mackerel-agent;
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settingsFmt = pkgs.formats.toml {};
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in {
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options.services.mackerel-agent = {
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enable = mkEnableOption "mackerel.io agent";
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# the upstream package runs as root, but doesn't seem to be strictly
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# necessary for basic functionality
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runAsRoot = mkEnableOption "running as root";
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autoRetirement = mkEnableOption ''
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retiring the host upon OS shutdown
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'';
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apiKeyFile = mkOption {
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type = types.path;
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example = "/run/keys/mackerel-api-key";
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description = ''
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Path to file containing the Mackerel API key. The file should contain a
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single line of the following form:
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`apikey = "EXAMPLE_API_KEY"`
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'';
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};
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settings = mkOption {
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description = ''
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Options for mackerel-agent.conf.
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Documentation:
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<https://mackerel.io/docs/entry/spec/agent>
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'';
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default = {};
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example = {
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verbose = false;
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silent = false;
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};
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type = types.submodule {
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freeformType = settingsFmt.type;
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options.host_status = {
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on_start = mkOption {
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type = types.enum [ "working" "standby" "maintenance" "poweroff" ];
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description = "Host status after agent startup.";
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default = "working";
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};
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on_stop = mkOption {
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type = types.enum [ "working" "standby" "maintenance" "poweroff" ];
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description = "Host status after agent shutdown.";
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default = "poweroff";
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};
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};
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options.diagnostic =
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mkEnableOption "collecting memory usage for the agent itself";
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};
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};
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};
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config = mkIf cfg.enable {
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environment.systemPackages = with pkgs; [ mackerel-agent ];
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environment.etc = {
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"mackerel-agent/mackerel-agent.conf".source =
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settingsFmt.generate "mackerel-agent.conf" cfg.settings;
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"mackerel-agent/conf.d/api-key.conf".source = cfg.apiKeyFile;
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};
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services.mackerel-agent.settings = {
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root = mkDefault "/var/lib/mackerel-agent";
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pidfile = mkDefault "/run/mackerel-agent/mackerel-agent.pid";
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# conf.d stores the symlink to cfg.apiKeyFile
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include = mkDefault "/etc/mackerel-agent/conf.d/*.conf";
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};
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# upstream service file in https://github.com/mackerelio/mackerel-agent/blob/master/packaging/rpm/src/mackerel-agent.service
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systemd.services.mackerel-agent = {
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description = "mackerel.io agent";
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wants = [ "network-online.target" ];
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after = [ "network-online.target" "nss-lookup.target" ];
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wantedBy = [ "multi-user.target" ];
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environment = {
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MACKEREL_PLUGIN_WORKDIR = mkDefault "%C/mackerel-agent";
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};
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serviceConfig = {
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DynamicUser = !cfg.runAsRoot;
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PrivateTmp = mkDefault true;
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CacheDirectory = "mackerel-agent";
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ConfigurationDirectory = "mackerel-agent";
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RuntimeDirectory = "mackerel-agent";
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StateDirectory = "mackerel-agent";
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ExecStart = "${pkgs.mackerel-agent}/bin/mackerel-agent supervise";
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ExecStopPost = mkIf cfg.autoRetirement "${pkg.mackerel-agent}/bin/mackerel-agent retire -force";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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LimitNOFILE = mkDefault 65536;
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LimitNPROC = mkDefault 65536;
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};
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restartTriggers = [
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config.environment.etc."mackerel-agent/mackerel-agent.conf".source
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];
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};
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};
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}
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