MuleSoft Technical Guides

MuleSoft – Splunk Integration

User MuleSoft Integration Team
Calendar February 10, 2021

Pushing Mule application logs to Splunk

Logging is an essential part of monitoring and troubleshooting issues and any production errors or visualizing the data. Logging must be consistent, reliable so we can use that information for discovering relevant data. Some external logging tools include ELK and Splunk
MuleSoft provides its logging mechanism for storing application logs. Although CloudHub has a limitation of 100 MB of logs or 30 days of logs. The blog typically talks MuleSoft Splunk Integration

For a robust logging mechanism, it is essential to have an external log analytic tool to further monitor the application.
Today we will be using Splunk as an external logging tool and integrating it with MuleSoft using Log4j2 HTTP appender to send mule application logs to Splunk. Logging to Splunk can be enabled on Cloud Hub and On-Premise.
First things first, we need to create a token in Splunk.

1. Go to Settings > Data > Data Inputs

2. Go to Settings > Data > Data Inputs > New Token

3. After Clicking on New Token, Click on HTTP Event Collector and add log4j as the source, since we will be sending logs from log4j to Splunk

4. Complete all the steps, and you will get the token value. The token value will be used to connect to Splunk from the log4j file in the MuleSoft application. Next Steps will involve configuring the HTTP Appender in the log4j file to connect to Splunk

5. Once you have created the token, make sure to enable the token by going to global settings. You can also enable SSL for this token and set the port. By the default the value is “8088”

6. Add the following snippet in the log4j2.xml in the mule application. We can also add SSL if the URL is HTTPS.

<Http name="Splunk" url="http://host:port/services/collector/raw">
<Property name="Authorization" value="Splunk {{Token-Value}}"></Property>
<PatternLayout pattern="%m%n"></PatternLayout>
<!--<TrustStore location="<path to trustore>" password="<truststore-password>"/> -->
and add this reference in Async Root
<AppenderRef ref = "Splunk"/>

7. For better log analysis and monitoring, it is recommended to use JSON logs. For this purpose, we can either use JSON logs or add log information in JSON format. Here is a snippet for the application that will be sending logs to Splunk

8. Once you start the application, you can see logs flowing to Splunk. To check that, click on the “Search and Monitoring” option.

9. After that, click on “Data Summary” and click on “Source Types” and search for Log4j ( see Step 3), and select log4j.

10. On selecting that, you can see the logs being pushed to Splunk

Pushing MuleSoft Anypoint Platform logs to Splunk

Sending MuleSoft Anypoint Platform (CloudHub) logs will require a slightly different process. CloudHub uses its default logging mechanism. To use our logging, we need to make specific changes to the log4j file so that we can override the default log4j configuration for CloudHub. Below are the few steps that need to be followed.

1. Raise a support ticket with MuleSoft to disable CloudHub application logs. Once that is done, you will have an option to disable logs “Disable Application Logs” at runtime while deploying the application

2. The next step is to add CloudHub log appenders to the log4j2.xml file in the mule application.

An example log4j2 file with a custom cloudhub appender.

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO" name="cloudhub" packages="">
        <RollingFile name="FILE"
            <PatternLayout pattern="[%d{MM-dd HH:mm:ss.SSS}] %-5p %c{1} [%t]: %m%n"/>
            <DefaultRolloverStrategy max="10"/>
                <SizeBasedTriggeringPolicy size="10 MB" />
        <Log4J2CloudhubLogAppender name="CLOUDHUB"
            <PatternLayout pattern="[%d{MM-dd HH:mm:ss}] %-5p %c{1} [%t]: %m%n"/>
<Http name="Splunk" url="http://host:port/services/collector/raw">
                                                <Property name="Authorization" value="Splunk {{Token-Value}}"></Property>
                                                <PatternLayout pattern="%m%n"></PatternLayout>
                                                <!--<TrustStore location="<path to trustore>" password="<truststore-password>"/> -->
        <AsyncRoot level="INFO">
            <AppenderRef ref="FILE"/>
            <AppenderRef ref="CLOUDHUB"/>
            <AppenderRef ref="Splunk"/>
        <AsyncLogger name="com.gigaspaces" level="ERROR"/>
        <AsyncLogger name="com.j_spaces" level="ERROR"/>
        <AsyncLogger name="com.sun.jini" level="ERROR"/>
        <AsyncLogger name="net.jini" level="ERROR"/>
        <AsyncLogger name="org.apache" level="WARN"/>
        <AsyncLogger name="org.apache.cxf" level="WARN"/>
        <AsyncLogger name="org.springframework.beans.factory" level="WARN"/>
        <AsyncLogger name="org.mule" level="INFO"/>
        <AsyncLogger name="com.mulesoft" level="INFO"/>
        <AsyncLogger name="org.jetel" level="WARN"/>x
        <AsyncLogger name="Tracking" level="WARN"/>

3. Once you deploy the application to MuleSoft Anypoint Platform CloudHub and disable CloudHub logs, it will use the log4j2 configuration which we have created


Feel free to drop your questions in the comments section on MuleSoft Splunk Integration.

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