Kubernetes File Sharing: A Better Solution

Published {$created} by Carsten Blum

Ad-hoc file sharing solutions, like WeTransfer or similar services, serve a purpose. They's quick for occasional transfers. However, their limitations become immediately apparent when integrated into a Kubernetes (k8s) environment or for consistent, scalable file management. The unscheduled nature of these services clashes with the predictable requirements of containerized applications and automation.

The Problem with Ad-Hoc: Reliability and Control

Consider a scenario where a k8s pod needs access to a large dataset for machine learning model training. Relying on a service like WeTransfer—or any similar tool—introduces significant dependencies and instability. Transfers aren’t guaranteed, file retention policies are opaque, and there’s minimal control over access. Furthermore, these ad-hoc solutions typically lack robust auditing and security features vital for production workloads. These tools were not designed as external storage for k8s workloads. Instead, a solution built around a reliable protocol like SFTP – specifically leveraging a service like ftpGrid – offers stability and predictable performance. Explore our SFTP and FTP quick start guide for a hands-on introduction.

Structured Storage with ftpGrid: A Kubernetes-Friendly Solution

ftpGrid addresses these shortcomings. We offer a scalable, managed SFTP and FTP solution. Unlike ad-hoc transfers, files reside within a structured storage environment with granular access control, quota management, and comprehensive audit logging. This aligns perfectly with the requirements of k8s deployments.

Here’s how ftpGrid improves upon ad-hoc methods:

• Persistent Storage: Files are stored reliably, adhering to configurable retention policies.
• Controlled Access: Implement granular permissions for individual users and accounts, mirroring k8s security principles. We support key-based authentication (SSH-ED25519 is recommended), alongside password authentication, though key-based is preferable.
• Auditing & Monitoring: All file operations are logged, providing a clear audit trail—essential for compliance and troubleshooting. Monitor storage and bandwidth usage via our dashboard.
• API Integration: Access ftpGrid as cloud storage directly from your applications via our SFTP API. This facilitates automated workflows and simplifies integration with k8s deployments.
• External Storage for k8s Workloads: Our architecture is well-suited to handle the demands of containerized applications. The free tier allows you to explore these capabilities immediately.

Pricing and Practical Considerations

Moving away from individual file transfers to a structured, managed service naturally has a pricing model. Our pricing page details the various tiers and features available. The cost is often offset by increased efficiency, reduced operational overhead, and improved security posture, especially when considering that our solution provides GDPR compliant hosting within the EU with no data scanning.