Logstash Output Plugin for Azure Data Explorer (Kusto)

This is a plugin for Logstash.

It is fully free and open source. The license is Apache 2.0.

This Azure Data Explorer (ADX) Logstash plugin enables you to process events from Logstash into an Azure Data Explorer database for later analysis.

This connector forwards data to Azure Data Explorer, Azure Synapse Data Explorer and Real time analytics in Fabric

Requirements

• Logstash version 6+. Installation instructions
• Azure Data Explorer cluster with a database. Read Create a cluster and database for more information.
• AAD Application credentials with permission to ingest data into Azure Data Explorer. Read Creating an AAD Application for more information.

Installation

To make the Azure Data Explorer plugin available in your Logstash environment, run the following command:

bin/logstash-plugin install logstash-output-kusto

Configuration

Perform configuration before sending events from Logstash to Azure Data Explorer. The following example shows the minimum you need to provide. It should be enough for most use-cases:

output {
	kusto {
            path => "/tmp/kusto/%{+YYYY-MM-dd-HH-mm}.txt"
            ingest_url => "https://ingest-<cluster-name>.kusto.windows.net/"
            app_id => "<application id>"
            app_key => "<application key/secret>"
            app_tenant => "<tenant id>"
            database => "<database name>"
            table => "<target table>"
            json_mapping => "<mapping name>"
            proxy_host => "<proxy host>"
            proxy_port => <proxy port>
            proxy_protocol => <"http"|"https">              
	}
}

More information about configuring Logstash can be found in the logstash configuration guide

Available Configuration Keys

Parameter Name	Description	Notes
path	The plugin writes events to temporary files before sending them to ADX. This parameter includes a path where files should be written and a time expression for file rotation to trigger an upload to the ADX service. The example above shows how to rotate the files every minute and check the Logstash docs for more information on time expressions.	Required
ingest_url	The Kusto endpoint for ingestion-related communication. See it on the Azure Portal.	Required
app_id, app_key, app_tenant	Credentials required to connect to the ADX service. Be sure to use an application with 'ingest' privileges.	Optional
managed_identity	Managed Identity to authenticate. For user-based managed ID, use the Client ID GUID. For system-based, use the value system. The ID needs to have 'ingest' privileges on the cluster.	Optional
database	Database name to place events	Required
table	Target table name to place events	Required
json_mapping	Maps each attribute from incoming event JSON strings to the appropriate column in the table. Note that this must be in JSON format, as this is the interface between Logstash and Kusto	Optional
recovery	If set to true (default), plugin will attempt to resend pre-existing temp files found in the path upon startup
delete_temp_files	Determines if temp files will be deleted after a successful upload (true is default; set false for debug purposes only)
flush_interval	The time (in seconds) for flushing writes to temporary files. Default is 2 seconds, 0 will flush on every event. Increase this value to reduce IO calls but keep in mind that events in the buffer will be lost in case of abrupt failure.
proxy_host	The proxy hostname for redirecting traffic to Kusto.
proxy_port	The proxy port for the proxy. Defaults to 80.
proxy_protocol	The proxy server protocol , is one of http or https.

Note : LS_JAVA_OPTS can be used to set proxy parameters as well (using export or SET options)

export  LS_JAVA_OPTS="-Dhttp.proxyHost=1.2.34 -Dhttp.proxyPort=8989 -Dhttps.proxyHost=1.2.3.4 -Dhttps.proxyPort=8989"

Release Notes and versions

Version	Release Date	Notes
2.0.8	2024-10-23	- Fix library deprecations, fix issues in the Azure Identity library
2.0.7	2024-01-01	- Update Kusto JAVA SDK
2.0.3	2023-12-12	- Make JSON mapping field optional. If not provided logstash output JSON attribute names will be used for column resolution
2.0.2	2023-11-28	- Bugfix for the scenario where the plugin uses managed identity. Instead of providing the managed identity name as empty in the config,it can completely be skipped
2.0.0	2023-09-19	- Upgrade to the latest Java SDK version 5.0.2. Tests have been performed on Logstash 8.5 and up (Does not work with 6.x or 7.x versions of Logstash - For these versions use 1.x.x versions of logstash-output-kusto gem) - Fixes CVE's in common-text & outdated Jackson libraries
1.0.6	2022-11-29	- Upgrade to the latest Java SDK 3.2.1 version. Tests have been performed on Logstash 6.x and up.

Development Requirements

• Openjdk 8 64bit (https://www.openlogic.com/openjdk-downloads)
• JRuby 9.2 or higher, defined with openjdk 8 64bit
• Logstash, defined with openjdk 8 64bit

It is reccomened to use the bundled jdk and jruby with logstash to avoid compatibility issues.

To fully build the gem, run:

bundle install
lock_jars
gem build

Contributing

All contributions are welcome: ideas, patches, documentation, bug reports, and complaints. Programming is not a required skill. It is more important to the community that you are able to contribute. For more information about contributing, see the CONTRIBUTING file.