kasane [ 重ね ] (n.) pile; heap; layers
This is not an official Google product
Kasane is a layering tool for kubernetes. It allows you to use the officially published YAML documents and extend them further with your local configuration.
Kasane can utilise Jsonnet for deep object modification and patching.
Kasane requires Python 3+. Install via pip:
pip install kasane
Installation via Homebrew:
brew tap google/kasane https://github.com/google/kasane.git brew install google/kasane/kasane
You can run kasane from a docker container, the official image is
gcr.io/kasaneapp/kasane. The image is based on alpine and comes pre-packaged with bash, curl, git and kubectl in addition to kasane itself. The workdir is set to
/app and the default command is
kasane show so you can quickly examine your local Kasanefiles like this:
$ docker run --rm -ti -v $PWD/examples/03-environment:/app gcr.io/kasaneapp/kasane config: defaultFlag: UNRESOLVED_ENV_VAR__DEFAULT_VALUE defaultFromKasanefile: value jsonnetEnv: UNRESOLVED_ENV_VAR__OTHER_VALUE kind: VendoredObject metadata: name: PreconfiguredObject
Tagged builds for versions starting with 0.1.4 are also available as e.g.
Helm is fully-featured package management solution for kubernetes. Compared to it, kasane is a swiss army knife. It's simple, lightweight, doesn't install helper code into your production. Kasane allows you to use original YAML files written by application authors, modifying them to your local needs. If you see a
kubectl apply -f http:// example you can turn it into a Kasane deployment with a single line of code and then extend it to your needs.
Kasane doesn't do any templating, relying on Jsonnet for data manipulation. You won't ever need to count number of spaces to make sure your yaml go template is rendered correctly.
Kasane is similar to Ksonnet but is much simpler to use. Kasane allows to re-use original YAML files and minimizes amount of custom Jsonnet code you need to write. Most of the time your Kasane project would consist of a Kasanefile and single yaml or jsonnet file. Still, Kasane allows runtime flexibility with conditional layers and custom environment.