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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.logstash;
ops = lib.optionalString;
verbosityFlag = "--log.level " + cfg.logLevel;
logstashConf = pkgs.writeText "logstash.conf" ''
input {
${cfg.inputConfig}
}
filter {
${cfg.filterConfig}
}
output {
${cfg.outputConfig}
}
'';
logstashSettingsYml = pkgs.writeText "logstash.yml" cfg.extraSettings;
logstashSettingsDir = pkgs.runCommand "logstash-settings" {
inherit logstashSettingsYml;
preferLocalBuild = true;
} ''
mkdir -p $out
ln -s $logstashSettingsYml $out/logstash.yml
'';
in
{
imports = [
(mkRenamedOptionModule [ "services" "logstash" "address" ] [ "services" "logstash" "listenAddress" ])
(mkRemovedOptionModule [ "services" "logstash" "enableWeb" ] "The web interface was removed from logstash")
];
###### interface
options = {
services.logstash = {
enable = mkOption {
type = types.bool;
default = false;
description = "Enable logstash.";
};
package = mkOption {
type = types.package;
default = pkgs.logstash;
defaultText = "pkgs.logstash";
example = literalExample "pkgs.logstash";
description = "Logstash package to use.";
};
plugins = mkOption {
type = types.listOf types.path;
default = [ ];
example = literalExample "[ pkgs.logstash-contrib ]";
description = "The paths to find other logstash plugins in.";
};
dataDir = mkOption {
type = types.str;
default = "/var/lib/logstash";
description = ''
A path to directory writable by logstash that it uses to store data.
Plugins will also have access to this path.
'';
};
logLevel = mkOption {
type = types.enum [ "debug" "info" "warn" "error" "fatal" ];
default = "warn";
description = "Logging verbosity level.";
};
filterWorkers = mkOption {
type = types.int;
default = 1;
description = "The quantity of filter workers to run.";
};
listenAddress = mkOption {
type = types.str;
default = "127.0.0.1";
description = "Address on which to start webserver.";
};
port = mkOption {
type = types.str;
default = "9292";
description = "Port on which to start webserver.";
};
inputConfig = mkOption {
type = types.lines;
default = ''generator { }'';
description = "Logstash input configuration.";
example = ''
# Read from journal
pipe {
command => "''${pkgs.systemd}/bin/journalctl -f -o json"
type => "syslog" codec => json {}
}
'';
};
filterConfig = mkOption {
type = types.lines;
default = "";
description = "logstash filter configuration.";
example = ''
if [type] == "syslog" {
# Keep only relevant systemd fields
# http://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html
prune {
whitelist_names => [
"type", "@timestamp", "@version",
"MESSAGE", "PRIORITY", "SYSLOG_FACILITY"
]
}
}
'';
};
outputConfig = mkOption {
type = types.lines;
default = ''stdout { codec => rubydebug }'';
description = "Logstash output configuration.";
example = ''
redis { host => ["localhost"] data_type => "list" key => "logstash" codec => json }
elasticsearch { }
'';
};
extraSettings = mkOption {
type = types.lines;
default = "";
description = "Extra Logstash settings in YAML format.";
example = ''
pipeline:
batch:
size: 125
delay: 5
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
systemd.services.logstash = with pkgs; {
description = "Logstash Daemon";
wantedBy = [ "multi-user.target" ];
environment = { JAVA_HOME = jre; };
path = [ pkgs.bash ];
serviceConfig = {
ExecStartPre = ''${pkgs.coreutils}/bin/mkdir -p "${cfg.dataDir}" ; ${pkgs.coreutils}/bin/chmod 700 "${cfg.dataDir}"'';
ExecStart = concatStringsSep " " (filter (s: stringLength s != 0) [
"${cfg.package}/bin/logstash"
"-w ${toString cfg.filterWorkers}"
(concatMapStringsSep " " (x: "--path.plugins ${x}") cfg.plugins)
"${verbosityFlag}"
"-f ${logstashConf}"
"--path.settings ${logstashSettingsDir}"
"--path.data ${cfg.dataDir}"
]);
};
};
};
}
|