Added helm envFrom value parameter for cluster-name (#3683)

* Added helm envFrom value parameter for cluster-name

* Update README.md file

* Add envFrom configuration to values.yaml

* Remove empty line in values.yaml

Author: omerap12

helm/aws-load-balancer-controller/README.md

@@ -243,6 +243,8 @@ The default values set by the application itself can be confirmed [here](https:/
 | `externalManagedTags`                          | Specifies the list of tag keys on AWS resources that are managed externally                                                                                                                                                                                                                                                                  | `[]`                                              |
 | `livenessProbe`                                | Liveness probe settings for the controller                                                                                                                                                                                                                                                                                                   | (see `values.yaml`)                               |
 | `env`                                          | Environment variables to set for aws-load-balancer-controller pod                                                                                                                                                                                                                                                                            | None                                              |
+| `envFrom`                                       | Environment variables to set for aws-load-balancer-controller pod from configMap or Secret                                                                                                                                                                                                                                                                              | None                                              |
+
 | `envSecretName`                                | AWS credentials as environment variables from Secret (Secret keys `key_id` and `access_key`).                                                                                                                                                                                                                                                | None                                              |
 | `hostNetwork`                                  | If `true`, use hostNetwork                                                                                                                                                                                                                                                                                                                   | `false`                                           |
 | `dnsPolicy`                                    | Set dnsPolicy if required                                                                                                                                                                                                                                                                                                                    | `ClusterFirst`                                    |

helm/aws-load-balancer-controller/templates/deployment.yaml

@@ -170,14 +170,17 @@ spec:
         {{- if .Values.loadBalancerClass }}
         - --load-balancer-class={{ .Values.loadBalancerClass }}
         {{- end }}
-        {{- if or .Values.env .Values.envSecretName }}
+        {{- if or .Values.env .Values.envSecretName .Values.envFrom }}
         env:
         {{- if .Values.env}}
         {{- range $key, $value := .Values.env }}
         - name: {{ $key }}
           value: "{{ $value }}"
         {{- end }}
         {{- end }}
+        {{- if .Values.envFrom }}
+        {{ .Values.envFrom | toYaml | nindent 8 }}
+        {{- end }}
         {{- if .Values.envSecretName  }}
         - name: AWS_ACCESS_KEY_ID
           valueFrom:

helm/aws-load-balancer-controller/values.yaml

@@ -281,8 +281,13 @@ env:
 # Use Environment variables credentials from Secret (aws-secret) for aws-load-balancer-controller pod similarly as The EBS CSI Driver does.
 # envSecretName: aws-secret
 
+# Use envFrom to set environment variables from a Secret or ConfigMap
+envFrom: 
+  # valueFrom:
+  #   - secretKeyRef:
+  #       name: aws-load-balancer-controller
+
 # Specifies if aws-load-balancer-controller should be started in hostNetwork mode.
-#
 # This is required if using a custom CNI where the managed control plane nodes are unable to initiate
 # network connections to the pods, for example using Calico CNI plugin on EKS. This is not required or
 # recommended if using the Amazon VPC CNI plugin.