Fluent Bit is a lightweight and high-performance log processor and forwarder. It is designed to collect data from various sources, process it, and deliver it to different destinations such as Elasticsearch, Kafka, or other logging services. Fluent Bit is part of the Fluentd ecosystem and is often used in environments where resource efficiency is critical, such as edge computing or IoT devices.
One common issue users encounter is Fluent Bit not respecting the configured log levels. This means that despite setting a specific log level, Fluent Bit continues to output logs at different levels, which can lead to unnecessary verbosity or missing critical logs.
Users may notice that Fluent Bit outputs logs at levels that do not match the configured settings. For example, setting the log level to error
but still receiving info
or debug
logs.
The root cause of Fluent Bit not respecting log levels often lies in incorrect configuration settings. Fluent Bit uses a configuration file where the log level is specified, but if this setting is not correctly applied or if there are multiple conflicting settings, Fluent Bit may not behave as expected.
The log level is typically set in the fluent-bit.conf
file under the [SERVICE]
section. The relevant parameter is Log_Level
, which can be set to error
, warn
, info
, or debug
.
To ensure Fluent Bit respects the log level settings, follow these steps:
Open your Fluent Bit configuration file, typically named fluent-bit.conf
. Locate the [SERVICE]
section and ensure the Log_Level
parameter is set correctly. For example:
[SERVICE]
Log_Level info
Ensure there are no conflicting log level settings elsewhere in the configuration.
After making changes to the configuration file, restart the Fluent Bit service to apply the new settings. Use the following command:
sudo systemctl restart fluent-bit
Or, if you are running Fluent Bit in a container, restart the container:
docker restart fluent-bit
Check the Fluent Bit logs to ensure that the log level is now being respected. You can use the following command to view the logs:
journalctl -u fluent-bit -f
Or, if using Docker:
docker logs -f fluent-bit
For more detailed information on Fluent Bit configuration, refer to the official Fluent Bit documentation. If you continue to experience issues, consider reaching out to the Fluent Bit community on GitHub for support.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)