https://github.com/carvel-dev/ytt-library-for-kubernetes-demo
Demo of ytt + kapp + k8s-lib to deploy a simple app with basic autoscaling
https://github.com/carvel-dev/ytt-library-for-kubernetes-demo
carvel ytt
Last synced: 5 months ago
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Demo of ytt + kapp + k8s-lib to deploy a simple app with basic autoscaling
- Host: GitHub
- URL: https://github.com/carvel-dev/ytt-library-for-kubernetes-demo
- Owner: carvel-dev
- License: apache-2.0
- Created: 2019-03-22T19:32:24.000Z (over 6 years ago)
- Default Branch: develop
- Last Pushed: 2024-02-29T01:02:10.000Z (over 1 year ago)
- Last Synced: 2025-04-19T18:33:35.766Z (6 months ago)
- Topics: carvel, ytt
- Language: Go
- Homepage:
- Size: 66.4 KB
- Stars: 8
- Watchers: 15
- Forks: 2
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Security: SECURITY.md
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README
# k8s-lib-demo
Deploy nginx ingress with [ytt](https://github.com/k14s/ytt) and [kapp](https://github.com/k14s/kapp)
```bash
$ 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](https://github.com/k14s/k8s-lib))
```bash
$ ytt -f apps/config | kapp -y deploy -a apps -f -
```
See that there is only one hello1 Pod
```bash
$ kapp inspect -a apps -t
```
Expose ingress to your machine with [kwt](https://github.com/k14s/kwt)
```bash
$ sudo -E kwt net start
```
Check that app successfully responds with configured text
```bash
$ 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
```bash
$ 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
```bash
$ 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](https://github.com/k14s/ytt), [kbld](https://github.com/k14s/kbld), and [kapp](https://github.com/k14s/kapp)
```bash
$ 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](https://docs.docker.com/install/linux/docker-ce/binaries/).
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.)
```yaml
---
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](https://carvel.dev/community/).
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](https://github.com/vmware-tanzu/carvel/blob/master/ADOPTERS.md)