Conftest is available for Windows, macOS and Linux on the releases page. On Linux amd64 and arm64 are supported architectures. On Linux and macOS you can download as follows:

$ wget
$ tar xzf conftest_0.21.0_Linux_x86_64.tar.gz
$ sudo mv conftest /usr/local/bin


Install with Homebrew on macOS or Linux:

brew tap instrumenta/instrumenta
brew install conftest


You can also install using Scoop on Windows:

scoop bucket add instrumenta
scoop install conftest


Conftest Docker images are also available. Simply mount your configuration and policy at /project and specify the relevant command like so:

$ docker run --rm -v $(pwd):/project instrumenta/conftest test deployment.yaml
FAIL - deployment.yaml - Containers must not run as root in Deployment hello-kubernetes