Fluent-bit containers jeopardize k8s host

Problem:

The client was facing a situation where fluent-bit containers jeopardized the k8s host by overusing the temporary space which is on the host.

Solution:

After the investigation, the expert team suggested the next solution to the client:

• Resource Limitations: Checked for resource limitations on the fluent-bit containers. Insufficient CPU or memory limits could have caused excessive resource usage, affecting the host’s temporary space. Appropriate resource limits were set based on the application’s needs.
• Log Volume: The logs generated by the fluent-bit containers took up significant space. Evaluated the log volume and implemented log rotation or cleanup strategies to manage storage usage and prevent it from impacting the host’s temporary space.
• Log Storage Configuration: Reviewed the configuration of the fluent-bit containers to ensure logs were stored in the correct location. Verified the log storage path to avoid logs accumulating in the temporary space due to misconfiguration.
• Log Retention Policy: Evaluated and implemented a log retention policy for fluent-bit containers, automatically removing older logs after a specified period to prevent excessive storage consumption.
• Monitoring and Alerting: Set up monitoring and alerting mechanisms to detect abnormal resource usage or storage consumption, allowing timely actions to prevent issues from escalating.
• Disk Space Management: Regularly monitored the disk space on Kubernetes hosts, implemented disk cleanup, removed unnecessary files, and optimized storage usage to avoid exhausting temporary space with unused files.

Conclusion:

The client’s issue with fluent-bit containers overusing the Kubernetes host’s temporary space was resolved by setting appropriate resource limits, managing log volumes, configuring log storage, implementing a log retention policy, and establishing monitoring and alerting mechanisms. Regular disk space management also helped prevent the recurrence of this problem.