From 02e79b9e52eeea4e33deaacbd09bb6e65e8504ca Mon Sep 17 00:00:00 2001
From: Justin Santa Barbara <justin@fathomdb.com>
Date: Sat, 27 Feb 2016 11:59:09 -0500
Subject: [PATCH] AWS: If we have no subnets, bail out early

We know the ELB call will fail, so we error out early rather than
hitting the API.  Preserves rate limit quota, and also allows us to give
a more self-evident message.

Fix #21993
---
 pkg/cloudprovider/providers/aws/aws.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkg/cloudprovider/providers/aws/aws.go b/pkg/cloudprovider/providers/aws/aws.go
index dbf171e4248..5ba3091486a 100644
--- a/pkg/cloudprovider/providers/aws/aws.go
+++ b/pkg/cloudprovider/providers/aws/aws.go
@@ -2149,6 +2149,11 @@ func (s *AWSCloud) EnsureLoadBalancer(name, region string, publicIP net.IP, port
 		return nil, err
 	}
 
+	// Bail out early if there are no subnets
+	if len(subnetIDs) == 0 {
+		return nil, fmt.Errorf("could not find any suitable subnets for creating the ELB")
+	}
+
 	// Create a security group for the load balancer
 	var securityGroupID string
 	{