Adding support for ACI DNS name labels (#97)

providers/azure/README.md

@@ -284,15 +284,60 @@ Name                             ResourceGroup    ProvisioningState    Image
 helloworld-2559879000-8vmjw  myResourceGroup    Succeeded            microsoft/aci-helloworld  52.179.3.180:80  1.0 core/1.5 gb  Linux     eastus
 ```
 
+### Schedule an ACI pod with a DNS Name label
+
+Add an annotation to your Pod manifest, `virtualkubelet.io/dnsnamelabel` keyed to what you'd like the Azure Container Instance to receive as a DNS Name, and deploy it.
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: helloworld
+  annotations:
+    virtualkubelet.io/dnsnamelabel: "helloworld-aci"
+spec:
+  containers:
+  - image: microsoft/aci-helloworld
+    imagePullPolicy: Always
+    name: helloworld
+    resources:
+      requests:
+        memory: 1G
+        cpu: 1
+    ports:
+    - containerPort: 80
+      name: http
+      protocol: TCP
+    - containerPort: 443
+      name: https
+  dnsPolicy: ClusterFirst
+  nodeName: virtual-kubelet
+```
+
+To confirm the Azure Container Instance received and bound the DNS Name specified, use the [az container show][az-container-show] Azure CLI command. Virtual Kubelet's naming
+convention will affect how you use this query, with the argument to `-n` broken down as: nameSpace-podName. Unless specified, Kubernetes will assume
+the namespace is `default`.
+
+```azurecli-interactive
+az container show -g myResourceGroup -n default-helloworld --query ipAddress.fqdn
+```
+
+Output:
+
+```console
+"helloworld-aci.westus.azurecontainer.io"
+```
+
 ## Remove the Virtual Kubelet
 
-You can remove your Virtual Kubelet node, you can delete the Helm deployment, by running the following command:
+You can remove your Virtual Kubelet node by deleting the Helm deployment. Run the following command:
 
 ```
 helm delete virtual-kubelet --purge
-``` 
+```
 
 <!-- LINKS -->
 [kubectl-create]: https://kubernetes.io/docs/user-guide/kubectl/v1.6/#create
 [kubectl-get]: https://kubernetes.io/docs/user-guide/kubectl/v1.8/#get
-[az-container-list]: https://docs.microsoft.com/en-us/cli/azure/aks?view=azure-cli-latest#az_aks_list
+[az-container-list]: https://docs.microsoft.com/en-us/cli/azure/container?view=azure-cli-latest#az_container_list
+[az-container-show]: https://docs.microsoft.com/en-us/cli/azure/container?view=azure-cli-latest#az_container_show

providers/azure/aci.go

@@ -26,6 +26,8 @@ import (
 // The service account secret mount path.
 const serviceAccountSecretMountPath = "/var/run/secrets/kubernetes.io/serviceaccount"
 
+const virtualKubeletDNSNameLabel = "virtualkubelet.io/dnsnamelabel"
+
 // ACIProvider implements the virtual-kubelet provider interface and communicates with Azure's ACI APIs.
 type ACIProvider struct {
 	aciClient          *aci.Client
@@ -231,6 +233,10 @@ func (p *ACIProvider) CreatePod(pod *v1.Pod) error {
 			Ports: ports,
 			Type:  "Public",
 		}
+
+		if dnsNameLabel := pod.Annotations[virtualKubeletDNSNameLabel]; dnsNameLabel != "" {
+			containerGroup.ContainerGroupProperties.IPAddress.DNSNameLabel = dnsNameLabel
+		}
 	}
 
 	podUID := string(pod.UID)

providers/azure/client/aci/client.go

@@ -10,8 +10,8 @@ import (
 const (
 	// BaseURI is the default URI used for compute services.
 	BaseURI    = "https://management.azure.com"
-	userAgent  = "virtual-kubelet/azure-arm-aci/2017-12-01"
-	apiVersion = "2017-12-01-preview"
+	userAgent  = "virtual-kubelet/azure-arm-aci/2018-02-01"
+	apiVersion = "2018-02-01-preview"
 
 	containerGroupURLPath                    = "subscriptions/{{.subscriptionId}}/resourceGroups/{{.resourceGroup}}/providers/Microsoft.ContainerInstance/containerGroups/{{.containerGroupName}}"
 	containerGroupListURLPath                = "subscriptions/{{.subscriptionId}}/providers/Microsoft.ContainerInstance/containerGroups"

providers/azure/client/aci/types.go

@@ -172,9 +172,10 @@ type ImageRegistryCredential struct {
 
 // IPAddress is IP address for the container group.
 type IPAddress struct {
-	Ports []Port `json:"ports,omitempty"`
-	Type  string `json:"type,omitempty"`
-	IP    string `json:"ip,omitempty"`
+	Ports        []Port `json:"ports,omitempty"`
+	Type         string `json:"type,omitempty"`
+	IP           string `json:"ip,omitempty"`
+	DNSNameLabel string `json:"dnsNameLabel,omitempty"`
 }
 
 // Logs is the logs.