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Fast and Simple Serverless Functions for Kubernetes

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<p align="center">
  <img src="https://fission.io/images/logo-gh.svg" width="300" />
  <br>
  <h1 align="center">Fission: Serverless Functions for Kubernetes</h1>
</p>

--------------

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. With Fission, developers can easily create and deploy serverless functions that can be triggered by a variety of events, such as HTTP requests, messages from a message queue, or scheduled tasks.

Fission provides a simple, easy-to-use interface for developers to create serverless functions in their language of choice, without having to worry about the underlying infrastructure. The framework also offers automatic scaling, so functions can scale up or down based on demand, without any additional configuration.

Fission operates on _just the code_: Docker and Kubernetes are
abstracted away under normal operation, though you can use both to
extend Fission if you want to.

Fission is extensible to any language; the core is written in Go, and
language-specific parts are isolated in something called
_environments_ (more below).  Fission currently supports NodeJS, Python, Ruby, Go, 
PHP, Bash, and any Linux executable, with more languages coming soon.

Table of Contents
=================
- [Table of Contents](#table-of-contents)
  - [Performance: 100msec cold start](#performance-100msec-cold-start)
  - [Kubernetes is the right place for Serverless](#kubernetes-is-the-right-place-for-serverless)
  - [Getting Started](#getting-started)
  - [Learn More](#learn-more)
  - [Contributing](#contributing)
  - [Who is using Fission?](#who-is-using-fission)
  - [Sponsors](#sponsors)
- [License](#license)

## Performance: 100msec cold start

Fission maintains a pool of "warm" containers that each contain a
small dynamic loader.  When a function is first called,
i.e. "cold-started", a running container is chosen and the function is
loaded.  This pool is what makes Fission fast: cold-start latencies
are typically about 100msec.

## Kubernetes is the right place for Serverless

We're built on Kubernetes because we think any non-trivial app will
use a combination of serverless functions and more conventional
microservices, and Kubernetes is a great framework to bring these
together seamlessly.

Building on Kubernetes also means that anything you do for operations
on your Kubernetes cluster &mdash; such as monitoring or log
aggregation &mdash; also helps with ops on your Fission deployment.

## Getting Started

```bash
  # Add the stock NodeJS env to your Fission deployment
  $ fission env create --name nodejs --image ghcr.io/fission/node-env

# Create a function with a javascript one-liner that prints "hello world"
  $ fission function create --name hello --env nodejs --code https://raw.githubusercontent.com/fission/examples/master/nodejs/hello.js

# Run the function.  This takes about 100msec the first time.
  $ fission function test --name hello
  Hello, world!
```

## Learn More

- Understand [Fission Concepts](https://fission.io/docs/concepts/).
- See the [installation guide](https://fission.io/docs/installation/) for installing and running Fission.
- You can learn more about Fission and get started from [Fission Docs](https://fission.io/docs).
- To see Fission in action, check out the [Fission Examples Repo](https://github.com/fission/examples).
- See the [troubleshooting guide](https://fission.io/docs/trouble-shooting/) for debugging your functions and Fission installation.

## Contributing

Check out the [contributing guide](CONTRIBUTING.md).

## Who is using Fission?
- [Fareye](https://www.getfareye.com)
- Apple
- [iQuanti](https://www.iquanti.com)
- A large telecom CSP
- [Gadget](https://gadget.dev)
- [CinnamonAI](https://cinnamon.is/en)
- [Armo](https://www.armosec.io/)
- [The Social Audience](https://thesocialaudience.com/)
- [KubeML](https://github.com/DiegoStock12/kubeml)
- Unilever
- [BD](https://www.bd.com/en-in)
- [Biofourmis](https://biofourmis.com/)
- [Babylon](https://www.babylonhealth.com/en-gb)

## Sponsors

The following companies, organizations, and individuals support Fission's ongoing maintenance and development. If you are using/contributing to Fission, we would be happy to list you here, please raise a Pull request.

# License

Fission is licensed under the Apache License 2.0 - see the [LICENSE](./LICENSE) file for details

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