Add an example of applicationSet with multiple kustomize environment (dev/staging/prod)

[lknite]

I know the answer is 'just use kustomization' but being new to argocd and kustomization I'm finding locating examples difficult.

Will I run a kustomize against a repo which will build additional application files which I need to include? When I try to ask I often get answer like sure you can do like this or this or this, but without any detail.

I suspect it is very common for someone who has come across argo to see it as a possible solution with multiple clusters. The idea will always be can I have one application file that I can apply to multiple clusters? Or will I need an application file for each cluster and the only difference will be the destination?

I wonder if a couple examples could be added, using a single argo instance with multiple clusters added:

1. here's how to install something like metric-server to multiple clusters
2. here's how to install nginx with an ingress using an fqdn built using the cluster names, e.g.:
   • demo.dev.domain.net, demo.test.domain.net, demo.prod.domain.net

I know the ApplicationSet will be here soon, but it would be good to know how its supposed to be done with what currently exists. I know App of Apps exists, so is that the answer? One application targets exactly one destination? So if I have 18 clusters I'll need 18 application files?

[kostis-codefresh]

I'm finding locating examples difficult.

Kustomize Overlays

• Example Repo https://github.com/kostis-codefresh/gitops-environment-promotion
• Usage guide https://codefresh.io/blog/how-to-model-your-gitops-environments-and-promote-releases-between-them/

Application Sets

• Example Repo https://github.com/kostis-codefresh/many-appsets-demo
• Usage guide https://codefresh.io/blog/how-to-structure-your-argo-cd-repositories-using-application-sets/

Cluster generator

• Example Repo https://github.com/kostis-codefresh/multi-app-multi-value-argocd
• Usage guide https://codefresh.io/blog/argocd-clusters-labels-with-apps/