diff options
Diffstat (limited to 'nixos/modules/services/monitoring/mackerel-agent.nix')
-rw-r--r-- | nixos/modules/services/monitoring/mackerel-agent.nix | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/nixos/modules/services/monitoring/mackerel-agent.nix b/nixos/modules/services/monitoring/mackerel-agent.nix new file mode 100644 index 00000000000..7046de9d403 --- /dev/null +++ b/nixos/modules/services/monitoring/mackerel-agent.nix @@ -0,0 +1,111 @@ +{ config, lib, pkgs, ... }: + +with lib; + +let + cfg = config.services.mackerel-agent; + settingsFmt = pkgs.formats.toml {}; +in { + options.services.mackerel-agent = { + enable = mkEnableOption "mackerel.io agent"; + + # the upstream package runs as root, but doesn't seem to be strictly + # necessary for basic functionality + runAsRoot = mkEnableOption "Whether to run as root."; + + autoRetirement = mkEnableOption '' + Whether to automatically retire the host upon OS shutdown. + ''; + + apiKeyFile = mkOption { + type = types.path; + default = ""; + example = "/run/keys/mackerel-api-key"; + description = '' + Path to file containing the Mackerel API key. The file should contain a + single line of the following form: + + <literallayout>apikey = "EXAMPLE_API_KEY"</literallayout> + ''; + }; + + settings = mkOption { + description = '' + Options for mackerel-agent.conf. + + Documentation: + <link xlink:href="https://mackerel.io/docs/entry/spec/agent"/> + ''; + + default = {}; + example = { + verbose = false; + silent = false; + }; + + type = types.submodule { + freeformType = settingsFmt.type; + + options.host_status = { + on_start = mkOption { + type = types.enum [ "working" "standby" "maintenance" "poweroff" ]; + description = "Host status after agent startup."; + default = "working"; + }; + on_stop = mkOption { + type = types.enum [ "working" "standby" "maintenance" "poweroff" ]; + description = "Host status after agent shutdown."; + default = "poweroff"; + }; + }; + + options.diagnostic = + mkEnableOption "Collect memory usage for the agent itself"; + }; + }; + }; + + config = mkIf cfg.enable { + environment.systemPackages = with pkgs; [ mackerel-agent ]; + + environment.etc = { + "mackerel-agent/mackerel-agent.conf".source = + settingsFmt.generate "mackerel-agent.conf" cfg.settings; + "mackerel-agent/conf.d/api-key.conf".source = cfg.apiKeyFile; + }; + + services.mackerel-agent.settings = { + root = mkDefault "/var/lib/mackerel-agent"; + pidfile = mkDefault "/run/mackerel-agent/mackerel-agent.pid"; + + # conf.d stores the symlink to cfg.apiKeyFile + include = mkDefault "/etc/mackerel-agent/conf.d/*.conf"; + }; + + # upstream service file in https://git.io/JUt4Q + systemd.services.mackerel-agent = { + description = "mackerel.io agent"; + after = [ "network-online.target" "nss-lookup.target" ]; + wantedBy = [ "multi-user.target" ]; + environment = { + MACKEREL_PLUGIN_WORKDIR = mkDefault "%C/mackerel-agent"; + }; + serviceConfig = { + DynamicUser = !cfg.runAsRoot; + PrivateTmp = mkDefault true; + CacheDirectory = "mackerel-agent"; + ConfigurationDirectory = "mackerel-agent"; + RuntimeDirectory = "mackerel-agent"; + StateDirectory = "mackerel-agent"; + ExecStart = "${pkgs.mackerel-agent}/bin/mackerel-agent supervise"; + ExecStopPost = mkIf cfg.autoRetirement "${pkg.mackerel-agent}/bin/mackerel-agent retire -force"; + ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID"; + LimitNOFILE = mkDefault 65536; + LimitNPROC = mkDefault 65536; + }; + restartTriggers = [ + config.environment.etc."mackerel-agent/mackerel-agent.conf".source + ]; + }; + }; +} |