Added patch snippets for adjusting env vars and resource allocation in the flux components

docs/configuration.md

@@ -12,6 +12,8 @@ Table of Contents
     - [`flux`](#flux)
     - [Package](#package)
   - [Flux Resources](#flux-resources)
+    - [Example resource requirement patch](#example-resource-requirement-patch)
+    - [Example environment variable injection](#example-environment-variable-injection)
   - [Big Bang Version](#big-bang-version)
   - [Environment Location](#environment-location)
   - [Registry Pull Credentials](#registry-pull-credentials)
@@ -118,6 +120,72 @@ In addition, each package contains its own GitRepository and HelmRelease resourc
 
 Settings for eny of these resources can be overridden by [patching](https://kubectl.docs.kubernetes.io/references/kustomize/patches/) the resource in your environment's kustomization files.  Use Flux's documentation for [GitRepository](https://toolkit.fluxcd.io/components/source/gitrepositories/), [HelmRelease](https://toolkit.fluxcd.io/components/helm/helmreleases/), and [Kustomization](https://toolkit.fluxcd.io/components/kustomize/kustomization/) to find settings for these resources.
 
+### Example resource requirement patch
+The following patch snippet could be used to adjust the resources requested by the `flux-system/helm-controller` resource. A similar patch could be used to adjust the resources required by the other flux components.
+```yaml
+- |-
+  apiVersion: apps/v1
+  kind: Deployment
+  metadata:
+    labels:
+      app.kubernetes.io/instance: flux-system
+      app.kubernetes.io/part-of: flux
+      app.kubernetes.io/version: v0.13.2
+      control-plane: controller
+    name: helm-controller
+    namespace: flux-system
+  spec:
+    replicas: 1
+    selector:
+      matchLabels:
+        app: helm-controller
+    template:
+      metadata:
+        annotations:
+          prometheus.io/port: "8080"
+          prometheus.io/scrape: "true"
+        labels:
+          app: helm-controller
+      spec:
+        containers:
+        - name: manager
+          resources:
+            limits:
+              cpu: 100m
+              memory: 1Gi
+            requests:
+              cpu: 100m
+              memory: 64Mi
+```
+> NOTE: If flux is under-resourced, occasionally requests can fail in a manner that looks like a network connectivity issue (use with caution)
+
+### Example environment variable injection
+The following patch snippet could be used to add AWS credential environment variables into the `flux-system/kustomize-controller` resource to enable SOPS decryption using a KMS key from outside of AWS:
+```yaml
+- |-
+  apiVersion: apps/v1
+  kind: Deployment
+  metadata:
+    name: kustomize-controller
+    namespace: flux-system
+  spec:
+    template:
+      spec:
+        containers:
+        - name: manager
+          env:
+          - name: AWS_ACCESS_KEY_ID
+            valueFrom:
+              secretKeyRef:
+                name: sops-aws-creds
+                key: access_key_id
+          - name: AWS_SECRET_ACCESS_KEY
+            valueFrom:
+              secretKeyRef:
+                name: sops-aws-creds
+                key: access_key_secret
+```
+
 ## Big Bang Version
 
 In your `kustomization.yaml` under your environment, here is an example of how to override the version of Big Bang you will use.  You can also use a tag or branch if desired.