allow external redis instance (#6)

Chart.yaml

@@ -34,3 +34,4 @@ dependencies:
   - name: redis
     version: 16.13.2
     repository: https://raw.githubusercontent.com/bitnami/charts/archive-full-index/bitnami
+    condition: redis.enabled

templates/configmap-env.yaml

@@ -32,8 +32,12 @@ data:
   MALLOC_ARENA_MAX: "2"
   NODE_ENV: "production"
   RAILS_ENV: "production"
+  {{- if .Values.redis.enabled }}
   REDIS_HOST: {{ template "mastodon.redis.fullname" . }}-master
-  REDIS_PORT: "6379"
+  {{- else }}
+  REDIS_HOST: {{ required "When the redis chart is disabled .Values.redis.hostname is required" .Values.redis.hostname }}
+  {{- end }}
+  REDIS_PORT: {{ .Values.redis.port | default "6379" | quote }}
   {{- if .Values.mastodon.s3.enabled }}
   S3_BUCKET: {{ .Values.mastodon.s3.bucket }}
   S3_ENABLED: "true"

values.yaml

@@ -167,6 +167,11 @@ postgresql:
 
 # https://github.com/bitnami/charts/tree/master/bitnami/redis#parameters
 redis:
+  # disable if you want to use an existing redis instance; in which case the
+  # values below must match those of that external redis instance
+  enabled: true
+  hostname: ""
+  port: 6379
   # you must set a password; the password generated by the redis chart will be
   # rotated on each upgrade:
   password: ""