Add extraEnvConfigMaps and document some values

There already is `envFromSecret` and `extraEnvSecrets`, so I made
`envFromConfigMap` behave like `envFromSecret` and added
`extraEnvConfigMaps` to replace it.

This pattern should make the intended use of the values clearer.

Author: Mario Valderrama

charts/cluster-autoscaler/Chart.yaml

@@ -17,4 +17,4 @@ name: cluster-autoscaler
 sources:
   - https://github.com/kubernetes/autoscaler/tree/master/cluster-autoscaler
 type: application
-version: 9.0.0
+version: 9.1.0

charts/cluster-autoscaler/README.md

@@ -46,6 +46,10 @@ Releases of the chart from `9.0.0` onwards return the naming of the chart to `cl
 
 To migrate from a 1.X release of the chart to a `9.0.0` or later release, you should first uninstall your `1.X` install of the `cluster-autoscaler-chart` chart, before performing the installation of the new `cluster-autoscaler` chart.
 
+## Migration from 9.0 to 9.1
+
+Starting from `9.1.0` the `envFromConfigMap` value is expected to contain the name of a ConfigMap that is used as ref for `envFrom`, similar to `envFromSecret`. If you want to keep the previous behaviour of `envFromConfigMap` you must rename it to `extraEnvConfigMaps`.
+
 ## Installing the Chart
 
 **By default, no deployment is created and nothing will autoscale**.
@@ -343,9 +347,13 @@ Though enough for the majority of installations, the default PodSecurityPolicy _
 | cloudProvider | string | `"aws"` | The cloud provider where the autoscaler runs. Currently only `gce`, `aws`, `azure` and `magnum` are supported. `aws` supported for AWS. `gce` for GCE. `azure` for Azure AKS. `magnum` for OpenStack Magnum. |
 | containerSecurityContext | object | `{}` | [Security context for container](https://kubernetes.io/docs/tasks/configure-pod-container/security-context/) |
 | dnsPolicy | string | `"ClusterFirst"` | Defaults to `ClusterFirst`. Valid values are: `ClusterFirstWithHostNet`, `ClusterFirst`, `Default` or `None`. If autoscaler does not depend on cluster DNS, recommended to set this to `Default`. |
+| envFromConfigMap | string | `""` | ConfigMap name to use as envFrom. |
+| envFromSecret | string | `""` | Secret name to use as envFrom. |
 | expanderPriorities | object | `{}` | The expanderPriorities is used if `extraArgs.expander` is set to `priority` and expanderPriorities is also set with the priorities. If `extraArgs.expander` is set to `priority`, then expanderPriorities is used to define cluster-autoscaler-priority-expander priorities. See: https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/expander/priority/readme.md |
 | extraArgs | object | `{"logtostderr":true,"stderrthreshold":"info","v":4}` | Additional container arguments. |
 | extraEnv | object | `{}` | Additional container environment variables. |
+| extraEnvConfigMaps | object | `{}` | Additional container environment variables from ConfigMaps. |
+| extraEnvSecrets | object | `{}` | Additional container environment variables from Secrets. |
 | fullnameOverride | string | `""` | String to fully override `cluster-autoscaler.fullname` template. |
 | image.pullPolicy | string | `"IfNotPresent"` | Image pull policy |
 | image.pullSecrets | list | `[]` | Image pull secrets |

charts/cluster-autoscaler/README.md.gotmpl

@@ -46,6 +46,10 @@ Releases of the chart from `9.0.0` onwards return the naming of the chart to `cl
 
 To migrate from a 1.X release of the chart to a `9.0.0` or later release, you should first uninstall your `1.X` install of the `cluster-autoscaler-chart` chart, before performing the installation of the new `cluster-autoscaler` chart.
 
+## Migration from 9.0 to 9.1
+
+Starting from `9.1.0` the `envFromConfigMap` value is expected to contain the name of a ConfigMap that is used as ref for `envFrom`, similar to `envFromSecret`. If you want to keep the previous behaviour of `envFromConfigMap` you must rename it to `extraEnvConfigMaps`.
+
 ## Installing the Chart
 
 **By default, no deployment is created and nothing will autoscale**.

charts/cluster-autoscaler/templates/deployment.yaml

@@ -142,7 +142,7 @@ spec:
             - name: {{ $key }}
               value: "{{ $value }}"
           {{- end }}
-          {{- range $key, $value := .Values.envFromConfigMap }}
+          {{- range $key, $value := .Values.extraEnvConfigMaps }}
             - name: {{ $key }}
               valueFrom:
                 configMapKeyRef:
@@ -156,11 +156,17 @@ spec:
                   name: {{ default (include "cluster-autoscaler.fullname" $) $value.name }}
                   key: {{ required "Must specify key!" $value.key }}
           {{- end }}
-          {{- if .Values.envFromSecret }}
+          {{- if or .Values.envFromSecret .Values.envFromConfigMap }}
           envFrom:
+          {{- if .Values.envFromSecret }}
             - secretRef:
                 name: {{ .Values.envFromSecret }}
           {{- end }}
+          {{- if .Values.envFromConfigMap }}
+            - configMapRef:
+                name: {{ .Values.envFromConfigMap }}
+          {{- end }}
+          {{- end }}
           livenessProbe:
             httpGet:
               path: /health-check

charts/cluster-autoscaler/values.yaml

@@ -150,6 +150,18 @@ extraArgs:
 # extraEnv -- Additional container environment variables.
 extraEnv: {}
 
+# extraEnvConfigMaps -- Additional container environment variables from ConfigMaps.
+extraEnvConfigMaps: {}
+
+# extraEnvSecrets -- Additional container environment variables from Secrets.
+extraEnvSecrets: {}
+
+# envFromConfigMap -- ConfigMap name to use as envFrom.
+envFromConfigMap: ""
+
+# envFromSecret -- Secret name to use as envFrom.
+envFromSecret: ""
+
 # fullnameOverride -- String to fully override `cluster-autoscaler.fullname` template.
 fullnameOverride: ""