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logkafka - Collect logs and send lines to Apache Kafka 0.8+

Introduction 中文文档

logkafka sends log file contents to kafka 0.8 line by line. It treats one line of file as one kafka message.

See FAQ if you wanna deploy it in production environment.

logkafka

Gitter

Features

  • log collecting configuration management with zookeeper
  • [log path with timeformat (collect files chronologically)](docs/Features.md#Log Path Pattern)
  • log file rotating
  • batching messages
  • compression (none, gzip, snappy)
  • [message regex filter](docs/Features.md#Regex Filter)
  • [user-defined line delimiter](docs/Features.md#Line Delimiter)
  • user-defined monitor

Differences with other log aggregation and monitoring tools

The main differences with flume, fluentd, logstash are

  • Management of log collecting configs and state:

    flume, fluentd, logstash keep log file configs and state locally: start local server for management of log file configs and state.

    logkafka keep log file configs and state in zookeeper: watch the node in zookeeper for configs changing, record file position in local position file, and push position info to zookeeper periodically.

  • Order of log collecting

    flume, fluentd, logstash all have INPUT type 'tail', they collecting all files simultaneously, without considering chronological order of log files.

    logkafka will collect files chronologically.

Users of logkafka

details...

Supported operating systems

  • GNU/Linux: recommended
  • MacOS: >=10.10

Requirements

  • librdkafka

  • libzookeeper_mt

  • libuv

  • libpcre2

  • PHP 5.3 and above (with zookeeper extension)

Build

Two methods, choose accordingly.

  1. Install librdkafka(>0.8.6), libzookeeper_mt, libuv(>v1.6.0), libpcre2(>10.20) manually, then

    cmake -H. -B_build -DCMAKE_INSTALL_PREFIX=_install
    cd _build
    make -j4
    make install
    
  2. Just let cmake handle the dependencies ( cmake version >= 3.0.2 ).

    cmake -H. -B_build -DCMAKE_INSTALL_PREFIX=_install \
                       -DINSTALL_LIBRDKAFKA=ON \
                       -DINSTALL_LIBZOOKEEPER_MT=ON \
                       -DINSTALL_LIBUV=ON \
                       -DINSTALL_LIBPCRE2=ON
    cd _build
    make -j4
    make install
    

    If any of the libs installation fail, please manually install it, and set the corresponding config -DINSTALL_LIBXXX=OFF.

Usage

Note: If you already have kafka and zookeeper installed, you can start from step 2 and replace zk connection string with your own in the following steps, default is 127.0.0.1:2181.

  1. Deploy Kafka and Zookeeper in local host

    tools/grid bootstrap
    
  2. Start logkafka

    • local conf

    Customizing _install/conf/logkafka.conf to your needs

     zookeeper.connect = 127.0.0.1:2181
     pos.path       = ../data/pos.myClusterName
     line.max.bytes = 1048576
     ...
    
    • run

    Run in the foreground

    _install/bin/logkafka -f _install/conf/logkafka.conf -e _install/conf/easylogging.conf
    

    Or as a daemon

    _install/bin/logkafka --daemon -f _install/conf/logkafka.conf -e _install/conf/easylogging.conf
    
  3. Configs Management

Use UI or command line tools.

3.1 UI (with kafka-manager)

We add logkafka as one kafka-manager extension. You need to install and start kafka-manager, add cluster with logkafka enabled, then you can manage logkafka with the 'Logkafka' menu.

  • How to add cluster with logkafka enabled

logkafka

  • How to create new config

logkafka

  • How to delete configs

logkafka

  • How to list configs and monitor sending progress

logkafka

3.2 Command line tools

We use php script (tools/log_config.php) to create/delete/list collecting configurations in zookeeper nodes.

If you do not know how to install php zookeeper module, check this.

  • How to create configs

    Example:

    Collect apache access log on host "test.qihoo.net" to kafka brokers with zk connection string "127.0.0.1:2181". The topic is "apache_access_log".

    php tools/log_config.php --create \
                             --zookeeper_connect=127.0.0.1:2181 \
                             --logkafka_id=test.qihoo.net \
                             --log_path=/usr/local/apache2/logs/access_log.%Y%m%d \
                             --topic=apache_access_log
    

    Note:

    • [hosname, log_path] is the key of one config.
  • How to delete configs

    php tools/log_config.php --delete \
                             --zookeeper_connect=127.0.0.1:2181 \
                             --logkafka_id=test.qihoo.net \
                             --log_path=/usr/local/apache2/logs/access_log.%Y%m%d
    
  • How to list configs and monitor sending progress

    php tools/log_config.php --list --zookeeper_connect=127.0.0.1:2181
    

    shows

    logkafka_id: test.qihoo.net
     log_path: /usr/local/apache2/logs/access_log.%Y%m%d
     Array
     (
         [conf] => Array
             (
                 [logkafka_id] => test.qihoo.net
                 [log_path] => /usr/local/apache2/logs/access_log.%Y%m%d
                 [topic] => apache_access_log
                 [partition] => -1
                 [key] =>
                 [required_acks] => 1
                 [compression_codec] => none
                 [batchsize] => 1000
                 [message_timeout_ms] => 0
                 [follow_last] => 1
                 [valid] => 1
             )
    
     )
    
More details about configuration management, see `php tools/log_config.php --help`.

Benchmark

We test with 2 brokers, 2 partitions

Name Description
rtt min/avg/max/mdev 0.478/0.665/1.004/0.139 ms
message average size 1000 bytes
batchsize 1000
required_acks 1
compression_codec none
message_timeout_ms 0
peak rates 20.5 Mb/s

Third Party

The most significant third party packages are:

  • confuse

  • easylogging

  • tclap

  • rapidjson

Thanks to the creators of these packages.

Developers

  1. Make sure you have lcov installed, check this

compile with unittest and debug type

cmake -H. -B_build -DCMAKE_INSTALL_PREFIX=_install \
                   -Dtest=ON \
                   -DCMAKE_BUILD_TYPE=Debug
cd _build
make
make logkafka_coverage  # run unittest
  1. Google C++ Style Guide

The code that not conform to this rule should be fixed before committing, you can use cpplint to check the modified files.

TODO

  1. Multi-line mode

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Collect logs and send lines to Apache Kafka

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