Install Krustlet

This guide shows how to install Krustlet.

From the Binary Releases

Every release of Krustlet provides compiled releases for a variety of Operating Systems. These compiled releases can be manually downloaded and installed. Please note these instructions will work on Linux, MacOS, and Windows (in PowerShell)

  1. Download your desired version from the releases page
  2. Unpack it (tar -xzf krustlet-v0.6.0-linux-amd64.tar.gz)
  3. Find the desired Krustlet provider in the unpacked directory, and move it to its desired destination somewhere in your $PATH (e.g. mv krustlet-wasi /usr/local/bin/ on unix-like systems or mv krustlet-wasi.exe C:\Windows\system32\ on Windows)

From there, you should be able to run the client in your terminal emulator. If your terminal cannot find Krustlet, check to make sure that your $PATH environment variable is set correctly.


If you’d like to validate the download, checksums can be downloaded from


As of Krustlet 0.4, there are now Windows builds available. However, there are some caveats. The underlying dependencies used to support Windows do not support certs with IP SANs (subject alternate names). Because of this, the serving certs requested during bootstrap will not work for local development options like minikube or KinD as they do not have an FQDN. So these builds can only be used in environments with an actual hostname/FQDN accessible to the Kubernetes cluster.

From Canary Builds

“Canary” builds are versions of Krustlet that are built from main. They are not official releases, and may not be stable. However, they offer the opportunity to test the cutting edge features before they are released.

Here are links to the common builds:

Compiling from Source

If you want to compile Krustlet from source, you will need to follow the developer guide.

Next Steps

After installing Krustlet, if you’d like to get started and see something running, go checkout any one of the demos. Each of them has a prebuilt WebAssembly module stored in a registry and a Kubernetes manifest that you can kubectl apply.

If you’d like to learn how to write your own simple module in Rust and deploy it, follow through the tutorial to deploy your first application.