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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.datadog-agent;
ddConf = {
dd_url = "https://app.datadoghq.com";
skip_ssl_validation = "no";
api_key = "";
confd_path = "/etc/datadog-agent/conf.d";
additional_checksd = "/etc/datadog-agent/checks.d";
use_dogstatsd = "yes";
}
// optionalAttrs (cfg.logLevel != null) { log_level = cfg.logLevel; }
// optionalAttrs (cfg.hostname != null) { inherit (cfg) hostname; }
// optionalAttrs (cfg.tags != null ) { tags = concatStringsSep ", " cfg.tags; }
// cfg.extraConfig;
# Generate Datadog configuration files for each configured checks.
# This works because check configurations have predictable paths,
# and because JSON is a valid subset of YAML.
makeCheckConfigs = entries: mapAttrsToList (name: conf: {
source = pkgs.writeText "${name}-check-conf.yaml" (builtins.toJSON conf);
target = "datadog-agent/conf.d/${name}.d/conf.yaml";
}) entries;
defaultChecks = {
disk = cfg.diskCheck;
network = cfg.networkCheck;
};
# Assemble all check configurations and the top-level agent
# configuration.
etcfiles = with pkgs; with builtins; [{
source = writeText "datadog.yaml" (toJSON ddConf);
target = "datadog-agent/datadog.yaml";
}] ++ makeCheckConfigs (cfg.checks // defaultChecks);
in {
options.services.datadog-agent = {
enable = mkOption {
description = ''
Whether to enable the datadog-agent v6 monitoring service
'';
default = false;
type = types.bool;
};
package = mkOption {
default = pkgs.datadog-agent;
defaultText = "pkgs.datadog-agent";
description = ''
Which DataDog v6 agent package to use.
Override the <literal>pythonPackages</literal> argument
of this derivation to include more checks.
'';
type = types.package;
};
apiKeyFile = mkOption {
description = ''
Path to a file containing the Datadog API key to associate the
agent with your account.
'';
example = "/run/keys/datadog_api_key";
type = types.path;
};
tags = mkOption {
description = "The tags to mark this Datadog agent";
example = [ "test" "service" ];
default = null;
type = types.nullOr (types.listOf types.str);
};
hostname = mkOption {
description = "The hostname to show in the Datadog dashboard (optional)";
default = null;
example = "mymachine.mydomain";
type = types.uniq (types.nullOr types.string);
};
logLevel = mkOption {
description = "Logging verbosity.";
default = null;
type = types.nullOr (types.enum ["DEBUG" "INFO" "WARN" "ERROR"]);
};
extraConfig = mkOption {
default = {};
type = types.attrs;
description = ''
Extra configuration options that will be merged into the
main config file <filename>datadog.yaml</filename>.
'';
};
checks = mkOption {
description = ''
Configuration for all Datadog checks. Keys of this attribute
set will be used as the name of the check to create the
appropriate configuration in `conf.d/$check.d/conf.yaml`.
The configuration is converted into JSON from the plain Nix
language configuration, meaning that you should write
configuration adhering to Datadog's documentation - but in Nix
language.
Refer to the implementation of this module (specifically the
definition of `defaultChecks`) for an example.
Note: The 'disk' and 'network' check are configured in
separate options because they exist by default. Attempting to
override their configuration here will have no effect.
'';
example = {
http_check = {
init_config = null; # sic!
instances = [
{
name = "some-service";
url = "http://localhost:1337/healthz";
tags = [ "some-service" ];
}
];
};
};
default = {};
# sic! The structure of the values is up to the check, so we can
# not usefully constrain the type further.
type = with types; attrsOf attrs;
};
diskCheck = mkOption {
description = "Disk check config";
type = types.attrs;
default = {
init_config = {};
instances = [ { use-mount = "no"; } ];
};
};
networkCheck = mkOption {
description = "Network check config";
type = types.attrs;
default = {
init_config = {};
# Network check only supports one configured instance
instances = [ { collect_connection_state = false;
excluded_interfaces = [ "lo" "lo0" ]; } ];
};
};
};
config = mkIf cfg.enable {
environment.systemPackages = [ cfg.package pkgs.sysstat pkgs.procps ];
users.extraUsers.datadog = {
description = "Datadog Agent User";
uid = config.ids.uids.datadog;
group = "datadog";
home = "/var/log/datadog/";
createHome = true;
};
users.extraGroups.datadog.gid = config.ids.gids.datadog;
systemd.services = let
makeService = attrs: recursiveUpdate {
path = [ cfg.package pkgs.python pkgs.sysstat pkgs.procps ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
User = "datadog";
Group = "datadog";
Restart = "always";
RestartSec = 2;
PrivateTmp = true;
};
restartTriggers = [ cfg.package ] ++ map (etc: etc.source) etcfiles;
} attrs;
in {
datadog-agent = makeService {
description = "Datadog agent monitor";
preStart = ''
chown -R datadog: /etc/datadog-agent
rm -f /etc/datadog-agent/auth_token
'';
script = ''
export DD_API_KEY=$(head -n1 ${cfg.apiKeyFile})
exec ${cfg.package}/bin/agent start -c /etc/datadog-agent/datadog.yaml
'';
serviceConfig.PermissionsStartOnly = true;
};
dd-jmxfetch = lib.mkIf (lib.hasAttr "jmx" cfg.checks) (makeService {
description = "Datadog JMX Fetcher";
path = [ cfg.package pkgs.python pkgs.sysstat pkgs.procps pkgs.jdk ];
serviceConfig.ExecStart = "${cfg.package}/bin/dd-jmxfetch";
});
};
environment.etc = etcfiles;
};
}
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