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Apache OpenWhisk is an open source serverless cloud platform

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# OpenWhisk

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OpenWhisk is a serverless functions platform for building cloud applications.
OpenWhisk offers a rich programming model for creating serverless APIs from functions,
composing functions into serverless workflows, and connecting events to functions using rules and triggers.
Learn more at [http://openwhisk.apache.org](http://openwhisk.apache.org).

* [Quick Start](#quick-start) (Deploy and Use OpenWhisk on your machine)
* [Deploy to Kubernetes](#deploy-to-kubernetes) (For development and production)
* For project contributors and Docker deployments:
  * [Deploy to Docker for Mac](./tools/macos/README.md)
  * [Deploy to Docker for Ubuntu](./tools/ubuntu-setup/README.md)
* [Learn Concepts and Commands](#learn-concepts-and-commands)
* [OpenWhisk Community and Support](#openwhisk-community-and-support)
* [Project Repository Structure](#project-repository-structure)

### Notice of Breaking Upgrade 10/17/2025

Apache Openwhisk has migrated to the Apache Pekko framework. The master branch as of 10/17/2025 uses Apache Pekko. This change results in a breaking change such that you must re-deploy new clusters and cutover traffic to the new cluster. All other changes should be transient to you other than instead of using Akka configuration overrides in your deployments, you would now need to update those to use the Pekko equivalent. A 3.x release branch will eventually follow this
change.

### Quick Start

The easiest way to start using OpenWhisk is to install the "Standalone" OpenWhisk stack.
This is a full-featured OpenWhisk stack running as a Java process for convenience.
Serverless functions run within Docker containers. You will need [Docker](https://docs.docker.com/install),
[Java](https://java.com/en/download/help/download_options.xml) and [Node.js](https://nodejs.org) available on your machine.

To get started:
```
git clone https://github.com/apache/openwhisk.git
cd openwhisk
./gradlew core:standalone:bootRun
```

- When the OpenWhisk stack is up, it will open your browser to a functions [Playground](./docs/images/playground-ui.png),
typically served from http://localhost:3232. The Playground allows you create and run functions directly from your browser.

- To make use of all OpenWhisk features, you will need the OpenWhisk command line tool called
`wsk` which you can download from https://s.apache.org/openwhisk-cli-download.
Please refer to the [CLI configuration](./docs/cli.md) for additional details. Typically you
configure the CLI for Standalone OpenWhisk as follows:
```
wsk property set \
  --apihost 'http://localhost:3233' \
  --auth '23bc46b1-71f6-4ed5-8c54-816aa4f8c502:123zO3xZCLrMN6v2BKK1dXYFpXlPkccOFqm12CdAsMgRU4VrNZ9lyGVCGuMDGIwP'
```

- Standalone OpenWhisk can be configured to deploy additional capabilities when that is desirable.
Additional resources are available [here](./core/standalone/README.md).

### Deploy to Kubernetes

OpenWhisk can also be installed on a Kubernetes cluster. You can use
a managed Kubernetes cluster provisioned from a public cloud provider
(e.g., AKS, EKS, IKS, GKE), or a cluster you manage yourself.
Additionally for local development, OpenWhisk is compatible with Minikube,
and Kubernetes for Mac using the support built into Docker 18.06 (or higher).

To get started:

```
git clone https://github.com/apache/openwhisk-deploy-kube.git
```

Then follow the instructions in the [OpenWhisk on Kubernetes README.md](https://github.com/apache/openwhisk-deploy-kube/blob/master/README.md).

### Learn Concepts and Commands

Browse the [documentation](docs/) to learn more. Here are some topics you may be
interested in:

- [System overview](docs/about.md)
- [Getting Started](docs/README.md)
- [Create and invoke actions](docs/actions.md)
- [Create triggers and rules](docs/triggers_rules.md)
- [Use and create packages](docs/packages.md)
- [Browse and use the catalog](docs/catalog.md)
- [OpenWhisk system details](docs/reference.md)
- [Implementing feeds](docs/feeds.md)
- [Developing a runtime for a new language](docs/actions-actionloop.md)

### OpenWhisk Community and Support

Report bugs, ask questions and request features [here on GitHub](../../issues).

You can also join the OpenWhisk Team on Slack [https://openwhisk-team.slack.com](https://openwhisk-team.slack.com) and chat with developers. To get access to our public Slack team, request an invite [https://openwhisk.apache.org/slack.html](https://openwhisk.apache.org/slack.html).

### Project Repository Structure

The OpenWhisk system is built from a [number of components](docs/dev/modules.md).  The picture below groups the components by their GitHub repos. Please open issues for a component against the appropriate repo (if in doubt just open against the main openwhisk repo).

![component/repo mapping](https://raw.githubusercontent.com/apache/openwhisk/master/docs/images/components_to_repos.png)

### What happens on an invocation?

This diagram depicts the steps which take place within Openwhisk when an action is invoked by the user:

![component/repo mapping](https://raw.githubusercontent.com/apache/openwhisk/master/docs/images/Openwhisk-flow-diagram.png)

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