update unit test and docs

Signed-off-by: Sachin Tiptur <sachin@kubermatic.com>

Author: Sachin Tiptur

README.md

@@ -136,6 +136,7 @@ endpoint that will expose them. The command will look similar to this:
 cd cloud-controller-manager/cmd/digitalocean-cloud-controller-manager
 DO_ACCESS_TOKEN=your_access_token                  \
 METRICS_ADDR=<host>:<port>                         \
+DO_IP_ADDR_FAMILIES=ipv4                           \
 digitalocean-cloud-controller-manager              \
   --kubeconfig <path to your kubeconfig file>      \
   --leader-elect=false --v=5 --cloud-provider=digitalocean
@@ -145,6 +146,11 @@ The `METRICS_ADDR` environment variable takes a valid endpoint that you'd
 like to use to serve your Prometheus metrics. To be valid it should be in the
 form `<host>:<port>`.
 
+The `DO_IP_ADDR_FAMILIES` is used to configure the required IP familes and the
+order in which address should be populated in nodes status. The accepted values
+are one of the `{"", "ipv4", "ipv6", "ipv4,ipv6", "ipv6,ipv4"}`.IPv4 is the 
+default, if not set or empty.
+
 After you have started up `digitalocean-cloud-controller-manager`, run the
 following curl command to view the Prometheus metrics output:
 

cloud-controller-manager/do/droplets_test.go

@@ -118,6 +118,12 @@ func newFakeDroplet() *godo.Droplet {
 					Type:      "public",
 				},
 			},
+			V6: []godo.NetworkV6{
+				{
+					IPAddress: "2a01::10",
+					Type:      "public",
+				},
+			},
 		},
 		Region: &godo.Region{
 			Name: "test-region",
@@ -143,6 +149,12 @@ func newFakeShutdownDroplet() *godo.Droplet {
 					Type:      "public",
 				},
 			},
+			V6: []godo.NetworkV6{
+				{
+					IPAddress: "2a01::10",
+					Type:      "public",
+				},
+			},
 		},
 		Region: &godo.Region{
 			Name: "test-region",
@@ -186,6 +198,10 @@ func TestNodeAddresses(t *testing.T) {
 			Type:    v1.NodeExternalIP,
 			Address: "99.99.99.99",
 		},
+		{
+			Type:    "public",
+			Address: "2a01::10",
+		},
 	}
 
 	addresses, err := instances.NodeAddresses(context.TODO(), "test-droplet")
@@ -222,6 +238,10 @@ func TestNodeAddressesByProviderID(t *testing.T) {
 			Type:    v1.NodeExternalIP,
 			Address: "99.99.99.99",
 		},
+		{
+			Type:    "public",
+			Address: "2a01::10",
+		},
 	}
 
 	addresses, err := instances.NodeAddressesByProviderID(context.TODO(), "digitalocean://123")

docs/controllers/node/examples/README.md

@@ -68,6 +68,8 @@ status:
     type: InternalIP
   - address: 138.197.174.81
     type: ExternalIP
+  - address: 2a03:b0c0:3:d0::e68:a001
+    type: ExternalIP
   allocatable:
     cpu: "4"
     memory: 6012700Ki
@@ -80,7 +82,7 @@ status:
 
 DigitalOcean cloud controller manager has made the cluster aware of the size of the node, in this case c-4 (4 core high CPU droplet). It has also assigned the node
 a failure domain which the scheduler can use for region failovers. Note also that the correct addresses were assigned to the node. The `InternalIP` now represents
-the private IP of the droplet, and the `ExternalIP` is it's public IP.
+the private IP of the droplet, and the `ExternalIP` is it's public IP. The order and IP families depends on the env variable `DO_IP_ADDR_FAMILIES`.
 
 ## Node clean up
 

docs/example-manifests/cloud-controller-manager.yml

@@ -66,6 +66,8 @@ spec:
               secretKeyRef:
                 name: digitalocean
                 key: access-token
+          - name: DO_IP_ADDR_FAMILIES
+            value: ipv4,ipv6
 
 ---
 apiVersion: v1