Support to use IPv6 address from ec2 meta data about cloud-provider-aws

[hangxie]

I have a quick and dirty patch to make things work for me:

root@3964054aba93:/go/src/k8s.io/kubernetes# git diff
diff --git a/pkg/cloudprovider/providers/aws/aws.go b/pkg/cloudprovider/providers/aws/aws.go
index c51e606175..f8f5c69728 100644
--- a/pkg/cloudprovider/providers/aws/aws.go
+++ b/pkg/cloudprovider/providers/aws/aws.go
@@ -571,6 +571,8 @@ type CloudConfig struct {
 		//yourself in an non-AWS cloud and open an issue, please indicate that in the
 		//issue body.
 		DisableStrictZoneCheck bool
+
+		ForceIpv6 bool
 	}
 	// [ServiceOverride "1"]
 	//  Service = s3
@@ -1329,7 +1331,12 @@ func (c *Cloud) NodeAddresses(ctx context.Context, name types.NodeName) ([]v1.No
 			if macID == "" {
 				continue
 			}
-			macPath := path.Join("network/interfaces/macs/", macID, "local-ipv4s")
+			macPath := ""
+			if c.cfg.Global.ForceIpv6 {
+				macPath = path.Join("network/interfaces/macs/", macID, "ipv6s")
+			} else {
+				macPath = path.Join("network/interfaces/macs/", macID, "local-ipv4s")
+			}
 			internalIPs, err := c.metadata.GetMetadata(macPath)
 			if err != nil {
 				return nil, fmt.Errorf("error querying AWS metadata for %q: %q", macPath, err)

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

In response to this:

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/close

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