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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.logstash;
in
{
###### interface
options = {
services.logstash = {
enable = mkOption {
default = false;
description = "Enable logstash";
};
enableWeb = mkOption {
default = false;
description = "Enable logstash web interface";
};
inputConfig = mkOption {
default = ''stdin { type => "example" }'';
description = "Logstash input configuration";
example = ''
# Read from journal
pipe {
command => "${pkgs.systemd}/bin/journalctl -f -o json"
type => "syslog" codec => json {}
}
'';
};
filterConfig = mkOption {
default = ''noop {}'';
description = "logstash filter configuration";
example = ''
if [type] == "syslog" {
# Keep only relevant systemd fields
# http://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html
prune {
whitelist_names => [
"type", "@timestamp", "@version",
"MESSAGE", "PRIORITY", "SYSLOG_FACILITY",
]
}
}
'';
};
outputConfig = mkOption {
default = ''stdout { debug => true debug_format => "json"}'';
description = "Logstash output configuration";
example = ''
redis { host => "localhost" data_type => "list" key => "logstash" codec => json }
elasticsearch { embedded => true }
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
systemd.services.logstash = with pkgs; {
description = "Logstash Daemon";
wantedBy = [ "multi-user.target" ];
environment = { JAVA_HOME = jre; };
serviceConfig = {
ExecStart = "${logstash}/bin/logstash agent -f ${writeText "logstash.conf" ''
input {
${cfg.inputConfig}
}
filter {
${cfg.filterConfig}
}
output {
${cfg.outputConfig}
}
''} ${optionalString cfg.enableWeb "-- web"}";
};
};
};
}
|