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# Logstash Logstash is part of the [Elastic Stack](https://www.elastic.co/products) along with Beats, Elasticsearch and Kibana. Logstash is a server-side data processing pipeline that ingests data from a multitude of sources simultaneously, transforms it, and then sends it to your favorite "stash." (Ours is Elasticsearch, naturally.). Logstash has over 200 plugins, and you can write your own very easily as well. For more info, see <https://www.elastic.co/products/logstash> ## Documentation and Getting Started You can find the documentation and getting started guides for Logstash on the [elastic.co site](https://www.elastic.co/guide/en/logstash/current/getting-started-with-logstash.html) For information about building the documentation, see the README in https://github.com/elastic/docs ## Downloads You can download officially released Logstash binaries, as well as debian/rpm packages for the supported platforms, from [downloads page](https://www.elastic.co/downloads/logstash). ## Need Help? - [Logstash Forum](https://discuss.elastic.co/c/logstash) - [Logstash Documentation](https://www.elastic.co/guide/en/logstash/current/index.html) - [#logstash on freenode IRC](https://webchat.freenode.net/?channels=logstash) - [Logstash Product Information](https://www.elastic.co/products/logstash) - [Elastic Support](https://www.elastic.co/subscriptions) ## Logstash Plugins Logstash plugins are hosted in separate repositories under the [logstash-plugins](https://github.com/logstash-plugins) github organization. Each plugin is a self-contained Ruby gem which gets published to RubyGems.org. ### Writing your own Plugin Logstash is known for its extensibility. There are hundreds of plugins for Logstash and you can write your own very easily! For more info on developing and testing these plugins, please see the [working with plugins section](https://www.elastic.co/guide/en/logstash/current/contributing-to-logstash.html) ### Plugin Issues and Pull Requests **Please open new issues and pull requests for plugins under its own repository** For example, if you have to report an issue/enhancement for the Elasticsearch output, please do so [here](https://github.com/logstash-plugins/logstash-output-elasticsearch/issues). Logstash core will continue to exist under this repository and all related issues and pull requests can be submitted here. ## Developing Logstash Core ### Prerequisites * Install JDK version 8 or 11. Make sure to set the `JAVA_HOME` environment variable to the path to your JDK installation directory. For example `set JAVA_HOME=<JDK_PATH>` * Install JRuby 9.2.x It is recommended to use a Ruby version manager such as [RVM](https://rvm.io/) or [rbenv](https://github.com/sstephenson/rbenv). * Install `rake` and `bundler` tool using `gem install rake` and `gem install bundler` respectively. ### RVM install (optional) If you prefer to use rvm (ruby version manager) to manage Ruby versions on your machine, follow these directions. In the Logstash folder: ```sh gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 \curl -sSL https://get.rvm.io | bash -s stable --ruby=$(cat .ruby-version) ``` ### Check Ruby version Before you proceed, please check your ruby version by: ```sh $ ruby -v ``` The printed version should be the same as in the `.ruby-version` file. ### Building Logstash The Logstash project includes the source code for all of Logstash, including the Elastic-Licensed X-Pack features and functions; to run Logstash from source using only the OSS-licensed code, export the `OSS` environment variable with a value of `true`: ``` sh export OSS=true ``` * To run Logstash from the repo you must first bootstrap the environment: ```sh rake bootstrap ``` * You can then use `bin/logstash` to start Logstash, but there are no plugins installed. To install default plugins, you can run: ```sh rake plugin:install-default ``` This will install the 80+ default plugins which makes Logstash ready to connect to multiple data sources, perform transformations and send the results to Elasticsearch and other destinations. To verify your environment, run the following to send your first event: ```sh bin/logstash -e 'input { stdin { } } output { stdout {} }' ``` This should start Logstash with stdin input waiting for you to enter an event ```sh hello world 2016-11-11T01:22:14.405+0000 0.0.0.0 hello world ``` **Advanced: Drip Launcher** [Drip](https://github.com/ninjudd/drip) is a tool that solves the slow JVM startup problem while developing Logstash. The drip script is intended to be a drop-in replacement for the java command. We recommend using drip during development, in particular for running tests. Using drip, the first invocation of a command will not be faster but the subsequent commands will be swift. To tell logstash to use drip, set the environment variable `` JAVACMD=`which drip` ``. Example (but see the *Testing* section below before running rspec for the first time): JAVACMD=`which drip` bin/rspec **Caveats** Drip does not work with STDIN. You cannot use drip for running configs which use the stdin plugin. ## Building Logstash Documentation To build the Logstash Reference (open source content only) on your local machine, clone the following repos: [logstash](https://github.com/elastic/logstash) - contains main docs about core features [logstash-docs](https://github.com/elastic/logstash-docs) - contains generated plugin docs [docs](https://github.com/elastic/docs) - contains doc build files Make sure you have the same branch checked out in `logstash` and `logstash-docs`. Check out `master` in the `docs` repo. Run the doc build script from within the `docs` repo. For example: ``` ./build_docs.pl --doc ../logstash/docs/index.asciidoc --chunk=1 -open ``` ## Testing Most of the unit tests in Logstash are written using [rspec](http://rspec.info/) for the Ruby parts. For the Java parts, we use junit. For testing you can use the *test* `rake` tasks and the `bin/rspec` command, see instructions below: ### Core tests 1- To run the core tests you can use the Gradle task: ./gradlew test or use the `rspec` tool to run all tests or run a specific test: bin/rspec bin/rspec spec/foo/bar_spec.rb Note that before running the `rspec` command for the first time you need to set up the RSpec test dependencies by running: ./gradlew bootstrap 2- To run the subset of tests covering the Java codebase only run: ./gradlew javaTests 3- To execute the complete test-suite including the integration tests run: ./gradlew check 4- To execute a single Ruby test run: SPEC_OPTS="-fd -P logstash-core/spec/logstash/api/commands/default_metadata_spec.rb" ./gradlew :logstash-core:rubyTests --tests org.logstash.RSpecTests 5- To execute single spec for integration test, run: ./gradlew integrationTests -PrubyIntegrationSpecs=specs/slowlog_spec.rb Sometimes you might find a change to a piece of Logstash code causes a test to hang. These can be hard to debug. If you set `LS_JAVA_OPTS="-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005"` you can connect to a running Logstash with your IDEs debugger which can be a great way of finding the issue. ### Plugins tests To run the tests of all currently installed plugins: rake test:plugin You can install the default set of plugins included in the logstash package: rake test:install-default --- Note that if a plugin is installed using the plugin manager `bin/logstash-plugin install ...` do not forget to also install the plugins development dependencies using the following command after the plugin installation: bin/logstash-plugin install --development ## Building Artifacts Built artifacts will be placed in the `LS_HOME/build` directory, and will create the directory if it is not already present. You can build a Logstash snapshot package as tarball or zip file ```sh ./gradlew assembleTarDi