Variables file heritance

[marcelofabricanti]

Hello guys,

Is there a way to accomplish the below goal in a clever/clean way?

I have one ArgoCD instance per cluster, managing only that cluster, and I have the following structure in Git:

Directory structure

/bases
   - fluentd
   - prometheus
   - ...
/clusters
   - dev_cluster
      - apps-in-cluster.yaml
      - apps
         - application-fluentd.yaml
         - application-prometheus.yaml
         - ...
   - prod_cluster
      - apps-in-cluster.yaml
      - apps
         - application-fluentd.yaml
         - application-prometheus.yaml
         - ...

• Bases folder contains manifest with basic configuration (the common appliable to all clusters).

• Clusters folder is the overlay layer, contains one folder per cluster, named as the cluster_name (lets use dev_cluster as example), and have the customizations above the base folder, to apply the apps to this cluster specifically, like: cpu/memory deployment constraints due cluster size, etc.

• apps-in-cluster.yaml file is just a Argo Application, with directory recurse enabled, saying "Apply the manifests in apps subfolder to this cluster (https://kubernetes.default.svc)"

Problem

I got many configurations that should be at cluster level, but is the same for all apps (like: cluster_name, domain_name, region, etc). So at each application-<<app_name>>.yaml file, I need to repeat them for Kustomize.

Is it possible to make a env-file for the whole cluster, and heritage the values in all bellow apps?

Something like this:

/clusters
   - dev_cluster
      - apps-in-cluster.yaml
      - configs.json
      - apps
         - application-fluentd.yaml
         - application-prometheus.yaml
         - ...

• configs.json

{ "cluster_name": "dev_cluster", "region": "us-east-1" }

And somehow, in all application-<<app_name>>.yaml files, I can use the cluster_name and region values to patch the "base" that will be applied in cluster?

Thanks