Components

A component is anything an app depends on but doesn't own. Two flavors:

• Kustomize components — pulled in by an app's kustomization.yaml via the components: field. Things like a CNPG Cluster patch tuned for one app, a Valkey sidecar, a backup Schedule.
• Shared resources — declared once at the cluster level and referenced by many apps. Things like internal HTTPRoute targets and StorageClass definitions.

Both fit one mental model: primitive an app composes with, not state the app maintains itself. So they live in one section, each with its own page.

Building blocks

Kustomize components (composable patches an app pulls in):

Page	What it composes
workspace	Namespace + RBAC stub — pre-condition for every other component
app-network-policy	Default-deny NetworkPolicy baseline
cnpg	CloudNative-PG Cluster resource with backup hooks
mongodb	Single-replica MongoDB StatefulSet
valkey	Single-replica Valkey/Redis cache (ephemeral)
backups	k8up Schedule pointed at the cluster Restic repo
email	SMTP relay credentials in a uniform shape

Shared cluster resources (declared once, referenced by many apps):

Page	What it provides
http-internal	Internal Gateway for non-public HTTPRoutes
storage	StorageClass catalogue (Longhorn variants + NFS)

How an app uses a component

# k8s/apps/talos/<app>/kustomization.yaml
components:
  - ../../../components/talos/workspace
  - ../../../components/talos/cnpg
  - ../../../components/talos/backups
  - ../../../components/talos/app-network-policy

The component overlays its own resources on top of the base manifests. Platform controllers like CNPG and k8up then reconcile what the components declared.

Adding a new component

1. It earns a component when two or more apps would benefit. One-off patches stay inline.
2. Declare it under k8s/components/<cluster>/<name> with its own kustomization.yaml.
3. Document it with a README.md in that folder — that README is what shows up under "Cluster Deployment" on the component's page (via the partial generator).
4. Reference it from each consuming app's kustomization.yaml.