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Kamal Proxy is a new, purpose-built HTTP proxy service that powers Kamal 2.0. It is designed to make zero-downtime deployments simpler, and comes with additional features to make your Rails applications faster and easier to operate. Kevin McConnell explains what Kamal Proxy does, why they built it, and how it works in his talk at #RailsWorld. #Kamalproxy #kamal2 #rails #rubyonrails #rails8 Thank you Shopify for sponsoring the editing and post-production of these videos. Check out insights from the Engineering team at: https://shopify.engineering/ Stay tuned: all 2024 Rails World videos will be subtitled in Japanese and Brazilian Portuguese soon thanks to our sponsor Happy Scribe, a transcription service built on Rails. https://www.happyscribe.com/
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## Introducing Kamal Proxy In this presentation, Kevin McConnell introduces **Kamal Proxy**, a new HTTP proxy service developed to enhance the capabilities of **Kamal 2.0**. This service is aimed at simplifying zero-downtime deployments for **Rails applications** while improving their speed and usability. McConnell outlines the essential functionalities of Kamal Proxy, explaining its purpose and benefits through a structured talk at **Rails World 2024**. ### Key Points Discussed: - **Overview of Kamal Proxy**: Kamal Proxy is a tool that aids in deploying apps, particularly those built with Rails, using a **Docker-based** architecture. It aims to manage traffic seamlessly between different versions of an app, ensuring no downtime during updates. - **Gapless Deployments**: The proxy supports gapless deployments by allowing traffic to migrate from the old to the new version of an app effortlessly through its proxy layer, providing a stable endpoint for user requests. - **Reasons for Developing Kamal Proxy**: - **Iterative Improvement**: The new proxy simplifies the previously complex mechanics of deploying apps with gapless transitions and enhances overall performance. - **User Experience Focus**: Aimed to provide an easy-to-use experience for users deploying their apps, Kamal Proxy integrates features that would often be found in hosted solutions, thus making self-hosting more appealing. - **Features of Kamal Proxy**: 1. **Host-based Routing**: Enables deploying multiple apps on a single server by distinguishing between app traffic based on hostnames. 2. **Automatic HTTPS**: Simplifies HTTPS setup using Let's Encrypt. 3. **Request and Response Buffering**: Mitigates issues from slow clients, allowing for smoother app performance. 4. **HTTP/2 Support**: Offers improved performance for apps with many assets through faster file downloads. 5. **Caching Mechanisms**: Enhances server efficiency by caching static files and responses, significantly increasing request handling capacity. 6. **X-Accel-Redirect Support**: Facilitates efficient file downloads by serving files directly, bypassing Rails processes for larger files. 7. **Maintenance Page Management**: Simplifies putting apps in maintenance mode and customizing maintenance messages. 8. **Request Pausing**: Allows temporary holding of incoming requests during brief maintenance periods without erroring out users. 9. **Rollout Features**: Facilitates gradual deployments by controlling traffic distribution between versions for testing purposes. ### Conclusion The presentation effectively highlights how Kamal Proxy is designed not only to simplify but also to enhance the deployment experience for Rails apps. By addressing both functional performance and user-friendly deployment features, Kamal Proxy is positioned as a robust solution for developers looking to manage their applications efficiently in production environments. In essence, Kamal Proxy represents a significant advancement for Rails developers, promoting effective self-hosted solutions by incorporating desirable features typically found in managed hosting environments.
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