k8s-lib-demo

Deploy nginx ingress with ytt and kapp

$ ytt -f nginx-ingress/ | kapp -y deploy -a nginx-ingress -f -

(Included nginx ingress is not configured for production use, only for demo purposes)

apps

Deploy two apps (see apps/hello1.yml for definition; relies on k8s-lib)

$ ytt -f apps/config | kapp -y deploy -a apps -f -

See that there is only one hello1 Pod

$ kapp inspect -a apps -t

Expose ingress to your machine with kwt

$ sudo -E kwt net start

Check that app successfully responds with configured text

$ curl http://nginx-ingress-controller.default.svc.cluster.local/

Throw some load at the app, and you should see it be autoscaled some time after

$ siege -c 100 http://nginx-ingress-controller.default.svc.cluster.local/

(In my setup, it took several minutes for HPA to scale up/down)

You can also access second app

$ curl http://nginx-ingress-controller.default.svc.cluster.local/ -H "Host: hello2.com"

simple-app (exercises kbld)

Deploy simple Golang app with help of ytt, kbld, and kapp

$ cd simple-app
$ ytt -f . | kbld -f - | kapp -y deploy -a simple-app -f - --diff-changes

kbld requires Docker CLI (docker) available on $PATH as it builds a container based on simple-app/src/ directory. You can grab Docker CLI binaries here.

If you are using minikube you'll have to expose Docker daemon via eval $(minikube docker-env) where kbld will run. Otherwise, you will have to add configuration (below) for pushing images to simple-app/manifest.yml so that built image is available to your Kubernetes cluster. (Don't forget to run docker login so that images can be pushed.)

---
apiVersion: kbld.k14s.io/v1alpha1
kind: ImageDestinations
destinations:
- image: simple-app-image
  newImage: docker.io/dkalinin/simple-app # or whatever push target your Docker can push to

simple-app-k8s-lib/ directory is similar to simple-app/ with an exception that it uses k8s-lib to generate app configuration (use ytt -f config/).

Join the Community and Make Carvel Better

Carvel is better because of our contributors and maintainers. It is because of you that we can bring great software to the community. Please join us during our online community meetings. Details can be found on our Carvel website.

You can chat with us on Kubernetes Slack in the #carvel channel and follow us on Twitter at @carvel_dev.

Check out which organizations are using and contributing to Carvel: Adopter's list