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https://github.com/lazzaretti/helm-demo
Demo using Dev Containers; part of the presentation "An introduction to Helm: A better way to manage your Kubernetes applications"
https://github.com/lazzaretti/helm-demo
helm helmfile
Last synced: 10 days ago
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Demo using Dev Containers; part of the presentation "An introduction to Helm: A better way to manage your Kubernetes applications"
- Host: GitHub
- URL: https://github.com/lazzaretti/helm-demo
- Owner: Lazzaretti
- Created: 2023-11-21T06:20:35.000Z (about 1 year ago)
- Default Branch: main
- Last Pushed: 2023-11-22T19:02:50.000Z (about 1 year ago)
- Last Synced: 2024-10-28T12:35:31.519Z (about 2 months ago)
- Topics: helm, helmfile
- Language: Shell
- Homepage: https://lazzaretti.me/blog/talk-2023-cncf-meetup/
- Size: 7.81 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Helm Demo
This is a Helm demo using Dev Containers.
It was created as part of the presentation "An introduction to Helm: A better way to manage your Kubernetes applications" at the [Cloud Native Computing Meetup | November 2023](https://www.meetup.com/cloud-native-computing-switzerland/events/291068669/)
## Setup
You can use DevContainer to run everything inside Docker without installing anything.
Start the DevContainer either within VS Code or with GitHub Codespaces.
* Use the Dev Containers in VS Code: Reopen in Container command from the Command Palette (`F1`, `Ctrl+Shift+P`).
* [](https://codespaces.new/Lazzaretti/helm-demo?quickstart=1)
## Simple nginx Helm chart
Let's deploy a simple nginx http server for [Bitnami](https://artifacthub.io/packages/helm/bitnami/nginx).
### 1. Install with cli
> You can also run this with the script `./demo-1.sh`
```sh
helm install hello-world oci://registry-1.docker.io/bitnamicharts/nginx
```
test it
```sh
kubectl port-forward svc/hello-world-nginx 8000:80
```
#### Step-by-step: What happened
Check what we have deployed:
1. Via the web page https://artifacthub.io/packages/helm/bitnami/nginx
2. Locally
> you can also run this with the script `./demo-2.sh`
1. Download and unpack the Helm chart
`helm pull oci://registry-1.docker.io/bitnamicharts/nginx --untar --untardir out/`
2. Inspect the out folder
`tree out/ -L 3`
3. See how it looks after it is rendered
> you can also run this with the script `./demo-3.sh`
`helm template --output-dir './out' hello-world oci://registry-1.docker.io/bitnamicharts/nginx`
5. Release
`helm install hello-world oci://registry-1.docker.io/bitnamicharts/nginx`
6. Check the release
> you can also run this with the script `./demo-4.sh`
`helm ls`
### 2. Upgrade & add parameters
> You can also run this with the script `./demo-10.sh`
```sh
kubectl get po
helm upgrade hello-world oci://registry-1.docker.io/bitnamicharts/nginx --set replicaCount=2
kubectl get po
helm ls
helm rollback hello-world
kubectl get po
```
### 2. Install with values from file
```sh
helm upgrade hello-world oci://registry-1.docker.io/bitnamicharts/nginx -f hello-world-values.yaml
```
### Show diff
```sh
helm plugin install https://github.com/databus23/helm-diff
helm diff upgrade hello-world oci://registry-1.docker.io/bitnamicharts/nginx -f hello-world-values.yaml
```
### Uninstall the chart
```sh
helm uninstall hello-world
```
## Use Helmfile
```sh
helmfile apply
```
## Helm with Terraform
(Make sure to uninstall the old chart first if you haven't done so already: `helm uninstall hello-world`)
```sh
terraform init
terraform apply
```
## Create an own chart
1. The creation of a chart has already been completed; you can achieve this by using `helm create mychart`
2. `helm install mychart mychart`
3. `helm ls`
4. `kubectl get configmap`
5. `kubectl get configmap mychart-config-map -o yaml`