sumo-log4j-appender

A Log4j appender that sends straight to Sumo Logic.

For the Log4j2 appender, please see https://github.com/SumoLogic/sumologic-log4j2-appender

For the Logback appender, please see https://github.com/SumoLogic/sumologic-logback-appender

Installation

The library can be added to your project using Maven Central by adding the following dependency to a POM file:

<dependency>
    <groupId>com.sumologic.plugins.log4j</groupId>
    <artifactId>sumo-log4j-appender</artifactId>
    <version>2.12</version>
</dependency>

Usage

Set up HTTP Hosted Collector Source in Sumo Logic

Follow these instructions for setting up an HTTP Source in Sumo Logic.

Log4J Configuration

Be sure to replace the url field with the URL after creating an HTTP Hosted Collector Source in Sumo Logic.

log4j.properties:

# Root logger option
log4j.rootLogger=INFO, sumo

# Direct log messages to sumo
log4j.appender.sumo=com.sumologic.log4j.SumoLogicAppender
log4j.appender.sumo.layout=org.apache.log4j.PatternLayout
log4j.appender.sumo.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS Z} [%t] %-5p %c - %m%n
log4j.appender.sumo.url=<YOUR_URL_HERE>

# Optional parameters for Metadata
log4j.appender.sumo.sourceName=<YOUR SOURCE NAME>
log4j.appender.sumo.sourceHost=<YOUR SOURCE HOST>
log4j.appender.sumo.sourceCategory=<YOUR SOURCE CATEGORY>

# Optional parameters for Proxy servers
log4j.appender.sumo.proxyAuth=<YOUR AUTHTYPE: basic or ntlm>
log4j.appender.sumo.proxyHost=<YOUR HOSTNAME>
log4j.appender.sumo.proxyPort=<YOUR PORT>
log4j.appender.sumo.proxyUser=<YOUR_USERNAME>
log4j.appender.sumo.proxyPassword=<YOUR_PASSWORD>
log4j.appender.sumo.proxyDomain=<YOUR_NTLM_DOMAIN>

Alternatively you can use XML configuration to configure the Sumo Logic Log4j appender:

log4j.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

    <appender name="sumo" class="com.sumologic.log4j.SumoLogicAppender">
        <param name="Threshold" value="INFO"/>
        <param name="url" value="<YOUR_URL_HERE>"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss,SSS Z} [%t] %-5p %c - %m%n"/>
        </layout>
    </appender>

    <root>
        <priority value="INFO"/>
        <appender-ref ref="sumo"/>
    </root>

</log4j:configuration>

Note: We recommending starting your layout pattern with a date and time such as %d{yyyy-MM-dd HH:mm:ss,SSS Z} for two reasons:

Having a consistent prefix that starts every message is necessary for multiline boundary detection to learn the message prefix needed to group mutiline messages, such as stack traces.
Sumo only supports certain time formats, and accidentally using an invalid time format could cause message time discrepancies.

Parameters

Parameter	Required?	Default Value	Description
url	Yes		HTTP collection endpoint URL
sourceName	No	"Http Input"	Source name to appear when searching on Sumo Logic by `_sourceName`
sourceHost	No	Client IP Address	Source host to appear when searching on Sumo Logic by `sourceHost`
sourceCategory	No	"Http Input"	Source category to appear when searching on Sumo Logic by _`sourceCategory`
proxyHost	No		Proxy host IP address
proxyPort	No		Proxy host port number
proxyAuth	No		For basic authentication proxy, set to "basic". For NTLM authentication proxy, set to "ntlm". For no authentication proxy, do not specify.
proxyUser	No		Proxy host username for basic and NTLM authentication. For no authentication proxy, do not specify.
proxyPassword	No		Proxy host password for basic and NTLM authentication. For no authentication proxy, do not specify.
proxyDomain	No		Proxy host domain name for NTLM authentication only
flushAllBeforeStopping	No	false	Flush all messages before stopping regardless of flushingAccuracy. Be sure to call `LogManager.shutdown();` when your application stops.
retryableHttpCodeRegex	No	^5.*	Regular expression specifying which HTTP error code(s) should be retried during sending. By default, all 5xx error codes will be retried.

TLS 1.2 Requirement

Sumo Logic only accepts connections from clients using TLS version 1.2 or greater. To utilize the content of this repo, ensure that it's running in an execution environment that is configured to use TLS 1.2 or greater.

Development

To build:

Run "mvn clean package" on the pom.xml in the main level of this project.
To test running a locally built JAR file, you may need to manually add the following dependencies to your project:

    <dependencies>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.2</version>
        </dependency>
    </dependencies>

License

The Sumo Logic Log4j Appender is published under the Apache Software License, Version 2.0. Please visit http://www.apache.org/licenses/LICENSE-2.0.txt for details.

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