Fluentd Invalid log level specified in Fluentd configuration.

What is Fluentd Invalid log level specified in Fluentd configuration.

Understanding Fluentd

Fluentd is an open-source data collector designed to unify the logging layer. It allows you to collect logs from various sources, transform them, and send them to different destinations. Fluentd is highly flexible and can be used to manage logs from multiple environments, making it a popular choice for log management and analysis.

Identifying the Symptom

When configuring Fluentd, you might encounter an error message indicating an InvalidLogLevelError. This error typically appears in the Fluentd logs or console output when starting the Fluentd service. The error message suggests that the log level specified in the configuration file is not recognized by Fluentd.

Understanding the Issue

The InvalidLogLevelError occurs when the log level defined in the Fluentd configuration file is not among the accepted values. Fluentd supports specific log levels to control the verbosity of logs, such as trace, debug, info, warn, error, and fatal. Any deviation from these predefined levels results in an error.

Common Causes

Typographical errors in the log level value. Using a custom log level not supported by Fluentd. Misunderstanding of the log level hierarchy.

Steps to Fix the Issue

To resolve the InvalidLogLevelError, follow these steps:

Step 1: Verify the Configuration File

Open your Fluentd configuration file, typically named fluent.conf, and locate the log level setting. Ensure that the log level is set to one of the following valid values: trace, debug, info, warn, error, or fatal.

[source] @type forward log_level info

Step 2: Correct the Log Level

If you find any discrepancies, correct the log level to a valid value. Save the changes to the configuration file.

Step 3: Restart Fluentd

After updating the configuration file, restart the Fluentd service to apply the changes. You can do this using the following command:

sudo systemctl restart td-agent

or, if you are running Fluentd directly:

fluentd -c /path/to/fluent.conf

Step 4: Verify the Logs

Check the Fluentd logs to ensure that the service starts without any errors. You can view the logs using:

sudo journalctl -u td-agent

Additional Resources

For more information on Fluentd configuration and log levels, you can refer to the official Fluentd Configuration File Documentation. Additionally, the Fluentd Logging Guide provides insights into managing log verbosity effectively.