Скачать или смотреть How to Redirect json_console Logs to a File for Logstash

Learn how to configure your `log4j.properties` to write `json_console` logs to a file instead of stdout, enhancing your log management process in Logstash.
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This video is based on the question https://stackoverflow.com/q/63358040/ asked by the user 'Vaishnav' ( https://stackoverflow.com/u/9005071/ ) and on the answer https://stackoverflow.com/a/63544025/ provided by the user 'Vaishnav' ( https://stackoverflow.com/u/9005071/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Redirecting json_console Logs to a File for Logstash

When working with logging frameworks like Logstash, managing how logs are stored and displayed is critical for monitoring and analytics. One common scenario developers encounter is redirecting json_console logs into a file instead of having them printed to the standard output (stdout). This guide walks you through how to effectively configure log4j.properties to achieve this goal.

Understanding the Problem

In many setups, logs are written in JSON format, particularly when using Logstash. The default configuration often directs these logs to standard output, which can get difficult to manage, especially when working inside a Docker container. The typical challenge many face is how to redirect these logs so that they are instead written to log files, thus enabling easier access and analysis.

For example, you might want to change your configuration to mimic this structure:

[[See Video to Reveal this Text or Code Snippet]]

Here are the current configurations that were originally set up in the log4j.properties file:

[[See Video to Reveal this Text or Code Snippet]]

Step-by-Step Solution

To utilize log4j.properties for writing the json_console logs to a file, follow these steps:

Step 1: Modify the Appender Configuration

Locate the log4j.properties file in your project.

Change the appender type for json_console to a RollingFile type instead of Console. This allows logs to be rolled over and written to a file.

Update the file output path to ensure logs go to the desired directory. Here’s an example of how this might look:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Comment Out Unneeded Output Options

After modifying your appender configuration, ensure any console output options in your Logstash config are commented out. This prevents the duplicate logging to stdout and ensures all logs are sent to your designated log files.

Here’s how to comment out unnecessary lines in logstash.conf:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Test Your Configuration

Once your configurations are updated, deploy the changes and test the setup:

Run your application inside Docker or your local environment.

Check the specified file to see if the logs are being written as expected.

Conclusion

By applying these adjustments to your log4j.properties configuration and Logstash settings, you can effectively redirect your json_console logs into a file for better management. This change not only improves the clarity and maintainability of your logs but also enhances your logging strategy within the Elastic Stack ecosystem.

Implementing these logging best practices will help streamline your development process and make log analysis more efficient. Happy coding!