Fix backwards compatibility when backend mode isnt set

docs/authentication.md

@@ -113,7 +113,7 @@ data:
         - system:masters
 ```
 
-It is also possible to configure alternative backend modes for aws-iam-authenticator. The `backendMode` configuration option allows defining multiple backends in a comma separated string. The mappings in these backends will be merged. When the same mapping is found in multiple backends, the first backend in the list will take precedence. If MountedFile is not included in the list of backends, no configmap is required and the [cluster-id](https://github.com/kubernetes-sigs/aws-iam-authenticator#what-is-a-cluster-id) will default to the cluster's master API DNS name. The cluster-id can be overridden by setting the `clusterID` API field. If you wish to continue using a configmap for authenticator settings other than mappings, MountedFile must be included in the backendMode list.
+It is also possible to configure alternative backend modes for aws-iam-authenticator. The `backendMode` configuration option allows defining multiple backends in a comma separated string. The mappings in these backends will be merged. When the same mapping is found in multiple backends, the first backend in the list will take precedence. If MountedFile is not included in the list of backends, no configmap is required and the [cluster-id](https://github.com/kubernetes-sigs/aws-iam-authenticator#what-is-a-cluster-id) will default to the cluster's name. The cluster-id can be overridden by setting the `clusterID` API field. If you wish to continue using a configmap for authenticator settings other than mappings, MountedFile must be included in the backendMode list.
 
 This requires an aws-iam-authenticator image >= 0.5.0 For more information see [usergroup-mappings](https://github.com/kubernetes-sigs/aws-iam-authenticator#4-create-iam-roleuser-to-kubernetes-usergroup-mappings)
 

upup/models/bindata.go

@@ -355,8 +355,8 @@ spec:
         {{- if or (not .Authentication.Aws.BackendMode) (contains "MountedFile" .Authentication.Aws.BackendMode) }}
         - --config=/etc/aws-iam-authenticator/config.yaml
         {{- end }}
-        {{- if or .Authentication.Aws.ClusterID (not (contains "MountedFile" .Authentication.Aws.BackendMode))}}
+        {{- if or .Authentication.Aws.ClusterID (and .Authentication.Aws.BackendMode (not (contains "MountedFile" .Authentication.Aws.BackendMode)))}}
-        - --cluster-id={{ or .Authentication.Aws.ClusterID .MasterPublicName }}
+        - --cluster-id={{ or .Authentication.Aws.ClusterID ClusterName }}
         {{- end }}
         - --state-dir=/var/aws-iam-authenticator
         - --kubeconfig-pregenerated=true

upup/models/cloudup/resources/addons/authentication.aws/k8s-1.12.yaml.template

@@ -131,8 +131,8 @@ spec:
         {{- if or (not .Authentication.Aws.BackendMode) (contains "MountedFile" .Authentication.Aws.BackendMode) }}
         - --config=/etc/aws-iam-authenticator/config.yaml
         {{- end }}
-        {{- if or .Authentication.Aws.ClusterID (not (contains "MountedFile" .Authentication.Aws.BackendMode))}}
+        {{- if or .Authentication.Aws.ClusterID (and .Authentication.Aws.BackendMode (not (contains "MountedFile" .Authentication.Aws.BackendMode)))}}
-        - --cluster-id={{ or .Authentication.Aws.ClusterID .MasterPublicName }}
+        - --cluster-id={{ or .Authentication.Aws.ClusterID ClusterName }}
         {{- end }}
         - --state-dir=/var/aws-iam-authenticator
         - --kubeconfig-pregenerated=true

upup/pkg/fi/cloudup/tests/bootstrapchannelbuilder/awsiamauthenticator/authentication.aws-k8s-1.12.yaml

@@ -108,10 +108,11 @@ spec:
       containers:
       - args:
         - server
-        - --cluster-id=api.minimal.example.com
+        - --config=/etc/aws-iam-authenticator/config.yaml
+        - --cluster-id=custom-cluster-ID
         - --state-dir=/var/aws-iam-authenticator
         - --kubeconfig-pregenerated=true
-        - --backend-mode=CRD
+        - --backend-mode=CRD,MountedFile
         image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/amazon/aws-iam-authenticator:v0.5.1-debian-stretch
         livenessProbe:
           httpGet:
@@ -128,6 +129,8 @@ spec:
             cpu: 10m
             memory: 20Mi
         volumeMounts:
+        - mountPath: /etc/aws-iam-authenticator/
+          name: config
         - mountPath: /var/aws-iam-authenticator/
           name: state
         - mountPath: /etc/kubernetes/aws-iam-authenticator/
@@ -143,6 +146,9 @@ spec:
       - key: CriticalAddonsOnly
         operator: Exists
       volumes:
+      - configMap:
+          name: aws-iam-authenticator
+        name: config
       - hostPath:
           path: /srv/kubernetes/aws-iam-authenticator/
         name: output

upup/pkg/fi/cloudup/tests/bootstrapchannelbuilder/awsiamauthenticator/cluster.yaml

@@ -8,7 +8,8 @@ spec:
     - manifest: s3://somebucket/example.yaml
   authentication:
     aws:
-      backendMode: CRD
+      backendMode: CRD,MountedFile
+      clusterID: custom-cluster-ID
   kubernetesApiAccess:
   - 0.0.0.0/0
   channel: stable

upup/pkg/fi/cloudup/tests/bootstrapchannelbuilder/awsiamauthenticator/manifest.yaml

@@ -97,7 +97,7 @@ spec:
   - id: k8s-1.12
     kubernetesVersion: '>=1.12.0'
     manifest: authentication.aws/k8s-1.12.yaml
-    manifestHash: c4f7cd3bf0b39ca7ab1b27f875da96bf5feacca9
+    manifestHash: dbfc79bb5908416ca06803461ab076b4896d0f7c
     name: authentication.aws
     selector:
       role.kubernetes.io/authentication: "1"