Conftest is available for Windows, macOS and Linux on the releases page.

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 openpolicyagent/conftest test deployment.yaml
FAIL - deployment.yaml - Containers must not run as root in Deployment hello-kubernetes

1 test, 0 passed, 0 warnings, 1 failure, 0 exceptions

NOTE: The instrumenta/conftest image is deprecated and will no longer be updated. Please use the openpolicyagent/conftest image.