nixpkgs/nixos/modules/services/logging/journaldriver.nix
pennae 2e751c0772 treewide: automatically md-convert option descriptions
the conversion procedure is simple:

 - find all things that look like options, ie calls to either `mkOption`
   or `lib.mkOption` that take an attrset. remember the attrset as the
   option
 - for all options, find a `description` attribute who's value is not a
   call to `mdDoc` or `lib.mdDoc`
 - textually convert the entire value of the attribute to MD with a few
   simple regexes (the set from mdize-module.sh)
 - if the change produced a change in the manual output, discard
 - if the change kept the manual unchanged, add some text to the
   description to make sure we've actually found an option. if the
   manual changes this time, keep the converted description

this procedure converts 80% of nixos options to markdown. around 2000
options remain to be inspected, but most of those fail the "does not
change the manual output check": currently the MD conversion process
does not faithfully convert docbook tags like <code> and <package>, so
any option using such tags will not be converted at all.
2022-07-30 15:16:34 +02:00

113 lines
3.5 KiB
Nix

# This module implements a systemd service for running journaldriver,
# a log forwarding agent that sends logs from journald to Stackdriver
# Logging.
#
# It can be enabled without extra configuration when running on GCP.
# On machines hosted elsewhere, the other configuration options need
# to be set.
#
# For further information please consult the documentation in the
# upstream repository at: https://github.com/tazjin/journaldriver/
{ config, lib, pkgs, ...}:
with lib; let cfg = config.services.journaldriver;
in {
options.services.journaldriver = {
enable = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Whether to enable journaldriver to forward journald logs to
Stackdriver Logging.
'';
};
logLevel = mkOption {
type = types.str;
default = "info";
description = lib.mdDoc ''
Log level at which journaldriver logs its own output.
'';
};
logName = mkOption {
type = with types; nullOr str;
default = null;
description = lib.mdDoc ''
Configures the name of the target log in Stackdriver Logging.
This option can be set to, for example, the hostname of a
machine to improve the user experience in the logging
overview.
'';
};
googleCloudProject = mkOption {
type = with types; nullOr str;
default = null;
description = lib.mdDoc ''
Configures the name of the Google Cloud project to which to
forward journald logs.
This option is required on non-GCP machines, but should not be
set on GCP instances.
'';
};
logStream = mkOption {
type = with types; nullOr str;
default = null;
description = lib.mdDoc ''
Configures the name of the Stackdriver Logging log stream into
which to write journald entries.
This option is required on non-GCP machines, but should not be
set on GCP instances.
'';
};
applicationCredentials = mkOption {
type = with types; nullOr path;
default = null;
description = lib.mdDoc ''
Path to the service account private key (in JSON-format) used
to forward log entries to Stackdriver Logging on non-GCP
instances.
This option is required on non-GCP machines, but should not be
set on GCP instances.
'';
};
};
config = mkIf cfg.enable {
systemd.services.journaldriver = {
description = "Stackdriver Logging journal forwarder";
script = "${pkgs.journaldriver}/bin/journaldriver";
after = [ "network-online.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
Restart = "always";
DynamicUser = true;
# This directive lets systemd automatically configure
# permissions on /var/lib/journaldriver, the directory in
# which journaldriver persists its cursor state.
StateDirectory = "journaldriver";
# This group is required for accessing journald.
SupplementaryGroups = "systemd-journal";
};
environment = {
RUST_LOG = cfg.logLevel;
LOG_NAME = cfg.logName;
LOG_STREAM = cfg.logStream;
GOOGLE_CLOUD_PROJECT = cfg.googleCloudProject;
GOOGLE_APPLICATION_CREDENTIALS = cfg.applicationCredentials;
};
};
};
}