add postgresql.existingHost & existingSecret for backend's SECRETKEY (#18)

* feat(postgresql/existingSecret): add an existingSecret for the SECRETKEY and allow setting an existingHost for the database

Signed-off-by: Toni Tauro <toni.tauro@adfinis.com>

* fix(values): lint

Signed-off-by: Toni Tauro <toni.tauro@adfinis.com>

---------

Signed-off-by: Toni Tauro <toni.tauro@adfinis.com>

Author: eyenx

charts/caluma/Chart.yaml

@@ -7,7 +7,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.10.8
+version: 0.11.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to

charts/caluma/templates/backend-deployment.yaml

@@ -27,7 +27,16 @@ spec:
           imagePullPolicy: {{ .Values.image.backend.pullPolicy }}
           env:
             - name: DATABASE_HOST
+              {{- if and .Values.postgresql.enabled .Values.backend.postgresql.existingHost }}
+              {{ fail "postgresql.enabled and backend.postgresql.existingHost are mutually exclusive, please pick one" }}
+              {{- end }}
+              {{- if .Values.postgresql.enabled }}
               value: "{{ template "caluma.fullname" . }}-postgresql"
+              {{- else if .Values.backend.postgresql.existingHost }}
+              value: {{ .Values.backend.postgresql.existingHost | quote }}
+              {{- else }}
+              {{ fail "neither postgresql.enabled or backend.postgresql.existingHost are set, please pick one" }}
+              {{- end }}
             - name: DATABASE_PORT
               value: "5432"
             - name: DATABASE_USER
@@ -40,7 +49,11 @@ spec:
             - name: SECRET_KEY
               valueFrom:
                 secretKeyRef:
+                  {{- if .Values.existingSecret }}
+                  name: {{ .Values.existingSecret | quote }}
+                  {{- else }}
                   name: "{{ template "caluma.fullname" . }}-backend"
+                  {{- end }}
                   key: secretkey
             - name: ALLOWED_HOSTS
               value: "{{ .Values.allowedHosts }}"

charts/caluma/templates/backend-secret.yaml

@@ -1,3 +1,4 @@
+{{- if not .Values.existingSecret }}
 {{- $fullName := include "caluma.fullname" . -}}
 apiVersion: v1
 kind: Secret
@@ -9,3 +10,4 @@ metadata:
 type: Opaque
 data:
   secretkey: {{ if .Values.secretKey }}{{ .Values.secretKey | b64enc | quote }}{{ else }}{{ randAlphaNum 40 | b64enc | quote }}{{ end }}
+{{- end }}

charts/caluma/values.yaml

@@ -32,6 +32,11 @@ nameOverride: ""
 fullnameOverride: ""
 
 secretKey: "SUPERSECRET"
+# instead of exposing the secretKey in the values, a existingSecret can be defined
+# if set no secret will be created by the Helm chart.
+# create the secret manually:
+# kubectl create secret generic -n your-namespace --from-literal=secretKey=SUPERSECRETKEY
+existingSecret: ""
 allowedHosts: "*"
 
 frontend:
@@ -54,6 +59,12 @@ backend:
   service:
     type: ClusterIP
 
+  postgresql:
+    ## Optionally sepcify an existing database host to connect to
+    ## this can only be used if postgresql.enabled is set to false
+    existingHost: ""
+
+
 ingress:
   enabled: false
   annotations: {}