Check Logs

AWS FireLens automatically handles log formatting, buffering, and delivery to Amazon S3. The AWS for Fluent Bit log router buffers container stdout and stderr streams in memory and periodically flushes them according to the configured upload_timeout or total_file_size threshold.

Step 1: Locate the Fluent Bit root log directory in Amazon S3

  1. In the AWS Management Console, navigate to the Amazon S3 service.

  2. Under Buckets, select your log repository bucket: firelens-logs-7180

  3. On the Objects tab, verify that Fluent Bit has created the top-level directory:

    • Folder name: fluent-bit-logs/

    Fluent Bit logs folder in S3 bucket

Step 2: Navigate partitioned directories to inspect log objects

  1. Click fluent-bit-logs/ to explore the generated directory hierarchy:

    • Click the container task folder
    • Continue clicking through the date and time prefixes: 2026/> > 10/ > 11/ > 10/ > 01/.

  2. In the minute partition folder, locate the generated log object

  3. Review the object metadata in the table:

    • Size: Approximately 2.7 KB
    • Storage class: Standard

    Inspect individual log object in S3

Step 3: Observe streaming log batch intervals

  1. As web traffic continues to hit the frontend application container, Fluent Bit continues streaming buffered log files into new minute folders.

    Inspect incremental log folders