kubectl/cmd/kinflate

kinflate

kinflate is a kubernetes cluster configuration utility, a prototype of ideas discussed in this proposal for Declarative Application Management (DAM).

DAM allows one to customize native kubernetes resources using new modification declarations rather than using template or configuration languages.

It facilitates coupling cluster state changes to version control commits. It encourages forking a configuration, customizing it, and occasionally rebasing to capture upgrades from the original configuration.

Installation

Prerequisites: Go, git

tmp=$(mktemp -d)
GOBIN=$tmp go get k8s.io/kubectl/cmd/kinflate

Example

Clone an app, customize the resources in the app with a name prefix, then pipe the resulting YAML directly to a cluster via kubectl.

# Download a demo app
cd $tmp
git clone https://github.com/monopole/damapps
cd damapps/demo

# Use kinflate to customize it
$tmp/kinflate setprefixname acme-

# See the added line:
grep namePrefix Kube-manifest.yaml
git diff Kube-manifest.yaml

# Send the app to your cluster:
$tmp/kinflate inflate -f . | kubectl apply -f -

At this point, you could commit your fork to your own repository, and rebase as desired.