nixpkgs/nixos/modules/services/misc/apache-kafka.nix
Dan Peebles 8def08a56c apache-kafka.service: pass in log4j config more explicitly
The implicit behavior of pulling it out of the classpath seemed not
to work properly and could be thrown off by other things on the
classpath also providing the properties file. This guarantees that
our settings stick.
2017-02-27 18:32:12 +00:00

161 lines
4.2 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.apache-kafka;
serverProperties =
if cfg.serverProperties != null then
cfg.serverProperties
else
''
# Generated by nixos
broker.id=${toString cfg.brokerId}
port=${toString cfg.port}
host.name=${cfg.hostname}
log.dirs=${concatStringsSep "," cfg.logDirs}
zookeeper.connect=${cfg.zookeeper}
${toString cfg.extraProperties}
'';
serverConfig = pkgs.writeText "server.properties" serverProperties;
logConfig = pkgs.writeText "log4j.properties" cfg.log4jProperties;
in {
options.services.apache-kafka = {
enable = mkOption {
description = "Whether to enable Apache Kafka.";
default = false;
type = types.bool;
};
brokerId = mkOption {
description = "Broker ID.";
default = -1;
type = types.int;
};
port = mkOption {
description = "Port number the broker should listen on.";
default = 9092;
type = types.int;
};
hostname = mkOption {
description = "Hostname the broker should bind to.";
default = "localhost";
type = types.string;
};
logDirs = mkOption {
description = "Log file directories";
default = [ "/tmp/kafka-logs" ];
type = types.listOf types.path;
};
zookeeper = mkOption {
description = "Zookeeper connection string";
default = "localhost:2181";
type = types.string;
};
extraProperties = mkOption {
description = "Extra properties for server.properties.";
type = types.nullOr types.lines;
default = null;
};
serverProperties = mkOption {
description = ''
Complete server.properties content. Other server.properties config
options will be ignored if this option is used.
'';
type = types.nullOr types.lines;
default = null;
};
log4jProperties = mkOption {
description = "Kafka log4j property configuration.";
default = ''
log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d] %p %m (%c)%n
'';
type = types.lines;
};
jvmOptions = mkOption {
description = "Extra command line options for the JVM running Kafka.";
default = [
"-server"
"-Xmx1G"
"-Xms1G"
"-XX:+UseCompressedOops"
"-XX:+UseParNewGC"
"-XX:+UseConcMarkSweepGC"
"-XX:+CMSClassUnloadingEnabled"
"-XX:+CMSScavengeBeforeRemark"
"-XX:+DisableExplicitGC"
"-Djava.awt.headless=true"
"-Djava.net.preferIPv4Stack=true"
];
type = types.listOf types.str;
example = [
"-Djava.net.preferIPv4Stack=true"
"-Dcom.sun.management.jmxremote"
"-Dcom.sun.management.jmxremote.local.only=true"
];
};
package = mkOption {
description = "The kafka package to use";
default = pkgs.apacheKafka;
defaultText = "pkgs.apacheKafka";
type = types.package;
};
};
config = mkIf cfg.enable {
environment.systemPackages = [cfg.package];
users.extraUsers = singleton {
name = "apache-kafka";
uid = config.ids.uids.apache-kafka;
description = "Apache Kafka daemon user";
home = head cfg.logDirs;
};
systemd.services.apache-kafka = {
description = "Apache Kafka Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
ExecStart = ''
${pkgs.jre}/bin/java \
-cp "${cfg.package}/libs/*" \
-Dlog4j.configuration=file:${logConfig} \
${toString cfg.jvmOptions} \
kafka.Kafka \
${serverConfig}
'';
User = "apache-kafka";
PermissionsStartOnly = true;
SuccessExitStatus = "0 143";
};
preStart = ''
mkdir -m 0700 -p ${concatStringsSep " " cfg.logDirs}
if [ "$(id -u)" = 0 ]; then
chown apache-kafka ${concatStringsSep " " cfg.logDirs};
fi
'';
};
};
}