nixpkgs/nixos/modules/services/monitoring/collectd.nix

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{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.services.collectd;
conf = pkgs.writeText "collectd.conf" ''
BaseDir "${cfg.dataDir}"
PIDFile "${cfg.pidFile}"
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AutoLoadPlugin ${if cfg.autoLoadPlugin then "true" else "false"}
Hostname ${config.networking.hostName}
LoadPlugin syslog
<Plugin "syslog">
LogLevel "info"
NotifyLevel "OKAY"
</Plugin>
${concatMapStrings (f: ''
Include "${f}"
'') cfg.include}
${cfg.extraConfig}
'';
in {
options.services.collectd = with types; {
enable = mkOption {
default = false;
description = ''
Whether to enable collectd agent.
'';
type = bool;
};
user = mkOption {
default = "collectd";
description = ''
User under which to run collectd.
'';
type = nullOr str;
};
dataDir = mkOption {
default = "/var/lib/collectd";
description = ''
Data directory for collectd agent.
'';
type = path;
};
pidFile = mkOption {
default = "/var/run/collectd.pid";
description = ''
Location of collectd pid file.
'';
type = path;
};
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autoLoadPlugin = mkOption {
default = false;
description = ''
Enable plugin autoloading.
'';
type = bool;
};
include = mkOption {
default = [];
description = ''
Additional paths to load config from.
'';
type = listOf str;
};
extraConfig = mkOption {
default = "";
description = ''
Extra configuration for collectd.
'';
type = lines;
};
};
config = mkIf cfg.enable {
systemd.services.collectd = {
description = "Collectd Monitoring Agent";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
ExecStart = "${pkgs.collectd}/sbin/collectd -C ${conf} -P ${cfg.pidFile}";
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Type = "forking";
PIDFile = cfg.pidFile;
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User = optional (cfg.user!="root") cfg.user;
PermissionsStartOnly = true;
};
preStart = ''
mkdir -m 0700 -p ${cfg.dataDir}
install -D /dev/null ${cfg.pidFile}
if [ "$(id -u)" = 0 ]; then
chown -R ${cfg.user} ${cfg.dataDir};
chown ${cfg.user} ${cfg.pidFile}
fi
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'';
};
users.extraUsers = optional (cfg.user == "collectd") {
name = "collectd";
uid = config.ids.uids.collectd;
};
};
}