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Kapp

https://get-kapp.io/

Kapp is a simple deployment tool focused on the concept of "K8S application" = a set of resources with the same label. Deploy and view groups of Kubernetes resources as "applications". Apply changes safely and predictably, watching resources as they converge.

NOTE : you have to be into delivery/kapp folder to run the commands below.

Install

You can install kapp CLI with :

./setup/install.sh

Basic usages

Deploy from a directory

  • Deploy an application :
kapp deploy -a podtatoserver-app -f ../kubectl/manifest.yaml

Note: No need to write a script to wait until all your resources are really created : kapp is waiting for all dependencies of your resources to be ready.

If you try to run the above command a second time, nothing happens : kapp only changes what is necessary.

  • Inspect an app : kapp inspect -a podtatoserver-app --tree
  • Display apps : kapp ls
  • Update an app :
    • change image tag in ../kubectl/manifest.yaml
    • display diff before deploying : kapp deploy -a podtatoserver-app -f ../kubectl/manifest.yaml --diff-changes
  • Delete app : kapp delete -a podtatoserver-app

Note: Those who know Terraform should see similarities regarding resources management.

Deploy with Helm charts

kapp -y deploy -a podtatoserver-chart -f <(helm template ph ../chart/)

and simply delete with kapp delete -a podtatoserver-chart

Deploy with Kustomize

kapp -y deploy -a podtatoserver-kusto-app -f <(kustomize build ../kustomize/overlay)

and simply delete with kapp delete -a podtatoserver-kusto-app

Useful usages

  • See what would be deployed

Example : If you want to check what resources Istio is going to deploy in your cluster :

kapp deploy -a istio -f <(istioctl manifest generate --set profile=default)
# To abort deployment, enter 'N' or 'Ctrl+C'

TODO