Installation

$ gem install kran
$ kran version
kran     1.0.0
docker   Docker version 27.5.1, build 9f9e405
krane    krane 3.7.3
kubectl  Client Version: v1.32.1

In a Gemfile

To pin kran per project, put it in a group the application does not load:

group :deploy, optional: true do
  gem "kran"
end

$ bundle install --with deploy
$ bundle exec kran version
kran     1.0.0

Kran runs every external command with Bundler.with_unbundled_env, so bundle exec kran can drive a krane from a different Gemfile or a global install. See running under bundle exec.

Tools kran does not install

Kran shells out to docker, krane, kubectl, and to ejson when a registry password comes from krane’s encrypted secrets. None of them is a gem dependency; see Prerequisites.

Krane is deliberately excluded: it pulls in a large part of the Kubernetes client stack, and most projects already pin it in a deploy bundle of their own.