Use fullnameOverride to fix duplicate deployments and services

Signed-off-by: Maël Valais <mael@vls.dev>

Author: maelvls

chart/jetstack-secure-gcm/charts/cert-manager/templates/deployment.yaml

@@ -4,7 +4,6 @@ metadata:
   name: {{ template "cert-manager.fullname" . }}
   namespace: {{ .Release.Namespace | quote }}
   labels:
-    app: {{ template "cert-manager.name" . }}
     app.kubernetes.io/name: {{ template "cert-manager.name" . }}
     app.kubernetes.io/instance: {{ .Release.Name }}
     app.kubernetes.io/managed-by: {{ .Release.Service }}
@@ -28,7 +27,6 @@ spec:
   template:
     metadata:
       labels:
-        app: {{ template "cert-manager.name" . }}
         app.kubernetes.io/name: {{ template "cert-manager.name" . }}
         app.kubernetes.io/instance: {{ .Release.Name }}
         app.kubernetes.io/component: "controller"

chart/jetstack-secure-gcm/charts/google-cas-issuer/templates/deployment.yaml

@@ -1,7 +1,7 @@
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: {{ include "google-cas-issuer.fullname" . }}-controller
+  name: {{ include "google-cas-issuer.fullname" . }}
   namespace: {{ .Release.Namespace | quote }}
   labels:
     {{- include "google-cas-issuer.labels" . | nindent 4 }}

chart/jetstack-secure-gcm/charts/preflight/templates/deployment.yaml

@@ -1,7 +1,7 @@
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: {{ include "preflight.fullname" . }}-agent
+  name: {{ include "preflight.fullname" . }}
   namespace: {{ .Release.Namespace | quote }}
   labels:
     {{- include "preflight.labels" . | nindent 4 }}

chart/jetstack-secure-gcm/templates/application.yaml

@@ -37,16 +37,19 @@ spec:
       #    app.kubernetes.io/name: "{{ .Chart.Name }}"        # Will be "jetstack-secure-gcm" due to the name override
       #    app.kubernetes.io/instance: "{{ .Release.Name }}"  # Example: "jetstack-secure-for-cert-mana-2"
       #
-      # Note that we had to set nameOverride for all the subcharts so that
-      # the app.kubernetes.io/name is correctly set on the cert-manager.
-      # In values.yaml [2], we have set:
+      # Note that we had to set nameOverride and fullnameOverrode for all
+      # the subcharts so that the app.kubernetes.io/name the same across all
+      # objects. In values.yaml [2], we have set:
       #
       #   cert-manager:
       #     nameOverride: jetstack-secure-gcm
+      #     fullnameOverride: jetstack-secure-gcm
       #   google-cas-issuer:
       #     nameOverride: jetstack-secure-gcm
+      #     fullnameOverride: google-cas-issuer
       #   preflight:
       #     nameOverride: jetstack-secure-gcm
+      #     fullnameOverride: preflight
       #
       # [1]: https://sigs.k8s.io/application/docs/api.md
       # [2] ./chart/jetstack-secure-gcm/values.yaml

chart/jetstack-secure-gcm/values.yaml

@@ -6,6 +6,7 @@
 
 cert-manager:
   nameOverride: jetstack-secure-gcm
+  fullnameOverride: cert-manager
   installCRDs: true
   global:
     rbac:
@@ -46,6 +47,7 @@ cert-manager:
 
 google-cas-issuer:
   nameOverride: jetstack-secure-gcm
+  fullnameOverride: google-cas-issuer
   installCRDs: true
   serviceAccount:
     create: false # see note (1)
@@ -55,6 +57,7 @@ google-cas-issuer:
 
 preflight:
   nameOverride: jetstack-secure-gcm
+  fullnameOverride: preflight
   serviceAccount:
     # name: foo
     create: false # see note (1)

docs/TESTING-DEPLOYER.md

@@ -190,16 +190,27 @@ spec:
       app.kubernetes.io/instance: {{ .Release.Name }}    # Example: "jetstack-secure-for-cert-mana-2"
 ```
 
-First, we set the name override for all our charts:
+Then, we use the `nameOverride` and `fullnameOverride`:
+1. `nameOverride` makes sure that all the objects across all subcharts have
+   the following label:
+   ```yaml
+   app.kubernetes.io/name: "jetstack-secure-gcm"
+   ```
+2. `fullnameOverride` makes sure that the object names actually make sense;
+   if we did not use this, we would end up with duplicate names in
+   deployments and services.
 
 ```yaml
 # https://github.com/jetstack/jetstack-secure-gcm/blob/main/chart/jetstack-secure-gcm/values.yaml
 cert-manager:
   nameOverride: jetstack-secure-gcm
+  fullnameOverride: jetstack-secure-gcm
 google-cas-issuer:
   nameOverride: jetstack-secure-gcm
+  fullnameOverride: google-cas-issuer
 preflight:
   nameOverride: jetstack-secure-gcm
+  fullnameOverride: preflight
 ```
 
 Then we make sure all the objects are set with the labels: