[aws-vpc-cni] Add CNI config via a configmap (#204)

* [aws-vpc-cni] add optional configmap for the cni config

* bump chart version

* add newline to config map

stable/aws-vpc-cni/README.md

@@ -29,6 +29,8 @@ The following table lists the configurable parameters for this chart and their d
 | Parameter               | Description                                             | Default                             |
 | ------------------------|---------------------------------------------------------|-------------------------------------|
 | `affinity`              | Map of node/pod affinities                              | `{}`                                |
+| `cniConfig.enabled`     | Enable overriding the default 10-aws.conflist file      | `false`                             |
+| `cniConfig.fileContents`| The contents of the custom cni config file              | `nil`                               |
 | `env`                   | List of environment variables. See [here](https://github.com/aws/amazon-vpc-cni-k8s#cni-configuration-variables) for options | (see `values.yaml`) |
 | `fullnameOverride`      | Override the fullname of the chart                      | `aws-node`                          |
 | `image.region`          | ECR repository region to use. Should match your cluster | `us-west-2`                         |

stable/aws-vpc-cni/templates/configmap.yaml

@@ -0,0 +1,10 @@
+{{- if .Values.cniConfig.enabled }}
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "aws-vpc-cni.fullname" . }}
+  labels:
+{{ include "aws-vpc-cni.labels" . | indent 4 }}
+data:
+  10-aws.conflist: {{ .Values.cniConfig.fileContents | b64enc }}
+{{- end -}}

stable/aws-vpc-cni/templates/daemonset.yaml

@@ -83,6 +83,13 @@ spec:
             name: cni-bin-dir
           - mountPath: /host/etc/cni/net.d
             name: cni-net-dir
+{{- if .Values.cniConfig.enabled }}
+            # the dockerfile copies the baked in config to this location, lets overwrite it with ours
+            # the entrypoint.sh script will then copy our config to /host/etc/cni/net.d on boot
+          - name: cni-config
+            mountPath: /app/10-aws.conflist
+            subPath: 10-aws.conflist
+{{- end }}
           - mountPath: /host/var/log/aws-routed-eni
             name: log-dir
           - mountPath: /var/run/dockershim.sock
@@ -98,6 +105,11 @@ spec:
       - name: cni-net-dir
         hostPath:
           path: /etc/cni/net.d
+{{- if .Values.cniConfig.enabled }}
+      - name: cni-config
+        configMap:
+          name: {{ include "aws-vpc-cni.fullname" . }}
+{{- end }}
       - name: dockershim
         hostPath:
           path: /var/run/dockershim.sock

stable/aws-vpc-cni/values.yaml

@@ -49,6 +49,10 @@ env:
 # You can then annotate and label the original aws-node resources and 'adopt' them into a helm release
 originalMatchLabels: false
 
+cniConfig: 
+  enabled: false
+  fileContents: ""
+
 imagePullSecrets: []
 
 fullnameOverride: "aws-node"