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{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.services.collectd;
unvalidated_conf = pkgs.writeText "collectd-unvalidated.conf" ''
BaseDir "${cfg.dataDir}"
AutoLoadPlugin ${boolToString cfg.autoLoadPlugin}
Hostname "${config.networking.hostName}"
LoadPlugin syslog
<Plugin "syslog">
LogLevel "info"
NotifyLevel "OKAY"
</Plugin>
${concatStrings (mapAttrsToList (plugin: pluginConfig: ''
LoadPlugin ${plugin}
<Plugin "${plugin}">
${pluginConfig}
</Plugin>
'') cfg.plugins)}
${concatMapStrings (f: ''
Include "${f}"
'') cfg.include}
${cfg.extraConfig}
'';
conf = if cfg.validateConfig then
pkgs.runCommand "collectd.conf" {} ''
echo testing ${unvalidated_conf}
# collectd -t fails if BaseDir does not exist.
sed '1s/^BaseDir.*$/BaseDir "."/' ${unvalidated_conf} > collectd.conf
${package}/bin/collectd -t -C collectd.conf
cp ${unvalidated_conf} $out
'' else unvalidated_conf;
package =
if cfg.buildMinimalPackage
then minimalPackage
else cfg.package;
minimalPackage = cfg.package.override {
enabledPlugins = [ "syslog" ] ++ builtins.attrNames cfg.plugins;
};
in {
options.services.collectd = with types; {
enable = mkEnableOption "collectd agent";
validateConfig = mkOption {
default = true;
description = ''
Validate the syntax of collectd configuration file at build time.
Disable this if you use the Include directive on files unavailable in
the build sandbox, or when cross-compiling.
'';
type = types.bool;
};
package = mkOption {
default = pkgs.collectd;
defaultText = literalExpression "pkgs.collectd";
description = ''
Which collectd package to use.
'';
type = types.package;
};
buildMinimalPackage = mkOption {
default = false;
description = ''
Build a minimal collectd package with only the configured `services.collectd.plugins`
'';
type = bool;
};
user = mkOption {
default = "collectd";
description = ''
User under which to run collectd.
'';
type = nullOr str;
};
dataDir = mkOption {
default = "/var/lib/collectd";
description = ''
Data directory for collectd agent.
'';
type = path;
};
autoLoadPlugin = mkOption {
default = false;
description = ''
Enable plugin autoloading.
'';
type = bool;
};
include = mkOption {
default = [];
description = ''
Additional paths to load config from.
'';
type = listOf str;
};
plugins = mkOption {
default = {};
example = { cpu = ""; memory = ""; network = "Server 192.168.1.1 25826"; };
description = ''
Attribute set of plugin names to plugin config segments
'';
type = attrsOf lines;
};
extraConfig = mkOption {
default = "";
description = ''
Extra configuration for collectd.
'';
type = lines;
};
};
config = mkIf cfg.enable {
systemd.tmpfiles.rules = [
"d '${cfg.dataDir}' - ${cfg.user} - - -"
];
systemd.services.collectd = {
description = "Collectd Monitoring Agent";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
ExecStart = "${package}/sbin/collectd -C ${conf} -f";
User = cfg.user;
Restart = "on-failure";
RestartSec = 3;
};
};
users.users = optionalAttrs (cfg.user == "collectd") {
collectd = {
isSystemUser = true;
group = "collectd";
};
};
users.groups = optionalAttrs (cfg.user == "collectd") {
collectd = {};
};
};
}
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