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Building an Example CloudImage

This is an example for building an nginx-ingress CloudImage using helm.

Download helm chart​

$ mkdir ingress-nginx && cd ingress-nginx
$ helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
$ helm pull ingress-nginx/ingress-nginx

Then you will got the chart:

$ ls
ingress-nginx-4.1.0.tgz

Add image list​

sealos will automatically download images parsed from those locations, and cache them into registry dir:

  • images/shim/$images_file
  • manifests/*.yaml
  • manifests rendered from chart in charts/ directory, chart directory and chart tar file are both supported

for example:

$ cat images/shim/nginxImages
k8s.gcr.io/ingress-nginx/controller:v1.2.0
k8s.gcr.io/ingress-nginx/kube-webhook-certgen:v1.1.1
$ tree
ingress-nginx
|-- Dockerfile
|-- charts
|   |-- ingress-nginx-4.1.0.tgz
|   `-- ingress-nginx.values.yaml

if custom values file named with form $chartName.values.yaml exists, manifests will rendered with custom values, just like helm template -f $chartName.values.yaml ....

Add a Dockerfile​

FROM scratch
COPY . .
CMD ["helm install ingress-nginx charts/ingress-nginx-4.1.0.tgz --namespace ingress-nginx --create-namespace -f charts/ingress-nginx.values.yaml"]

Build​

$ sealos build -f Dockerfile -t docker.io/fanux/ingress-nginx:v1.2.0 .

Push to registry​

$ sealos login docker.io
$ sealos push docker.io/fanux/ingress-nginx:v1.2.0