Apache OpenWhisk vs Kubeless: What are the differences?

Introduction

In this markdown code, we will discuss the key differences between Apache OpenWhisk and Kubeless, two popular serverless platforms.

1. Execution Model: Apache OpenWhisk follows an event-driven execution model, where functions are triggered by events or time-based intervals. Kubeless, on the other hand, follows a function-driven execution model, where functions are directly invoked by external triggers or APIs.

2. Language Support: Apache OpenWhisk supports a wide range of programming languages, including JavaScript, Python, Java, Ruby, Swift, and more. Kubeless primarily focuses on providing support for Python and Node.js, although it also allows the execution of custom Docker containers to support other languages.

3. Infrastructure: Apache OpenWhisk is built on a microservices architecture, leveraging Docker containers and Kubernetes for scalability and resiliency. Kubeless is also based on Kubernetes, making it simpler to deploy and manage functions within a Kubernetes cluster.

4. Event Sources: Apache OpenWhisk offers a comprehensive set of built-in event sources, such as HTTP, timer, message queue, database, and IoT devices. Kubeless provides a pluggable architecture, allowing users to connect to various event sources and trigger functions based on events generated by those sources.

5. Ecosystem Integration: Apache OpenWhisk has a strong integration with other cloud services, such as IBM Cloud, Amazon Web Services (AWS), and Azure. It provides seamless integration with these services, enabling developers to leverage their existing cloud infrastructure. Kubeless, being Kubernetes-based, can easily integrate with other Kubernetes-native tools and services.

6. Community Support: Apache OpenWhisk has a larger and more active community compared to Kubeless. It has a diverse user base and a wide range of contributors, resulting in better support, documentation, and continuous improvement. Kubeless, although relatively newer, also has an active community, but with fewer resources and contributors.

In summary, Apache OpenWhisk and Kubeless differ in their execution models, language support, infrastructure, event sources, ecosystem integration, and community support. Apache OpenWhisk offers a more versatile and feature-rich platform with broader language support and extensive integration options. Kubeless, on the other hand, is simpler to deploy and manage within a Kubernetes environment, with a narrower focus on Python and Node.js. Choose the platform that best fits your requirements and resources.