title: CloudFormation template AutoScalingGroup availability zones
body: <p>Hi I would like to get all my servers in one availability zone, namely us-west-1a.  How can I specify this with an autoscalinggroup? </p>
  
  <pre><code>  "MyFixedSizeGroup":{
      "Type":"AWS::AutoScaling::AutoScalingGroup",
      "Properties":{
          "LaunchConfigurationName":{"Ref":"GlobalWorkersSmallLaunchConf"},
          "AvailabilityZones" :["us-west-1a"],
          "MinSize":"3",
          "MaxSize":"3",
          "DesiredCapacity":"3",
          "Tags":[{"Key":"Name", "Value":"Neo4j Instance", "PropagateAtLaunch":"true"}],
           "NotificationConfiguration" : {
        "TopicARN" : { "Ref" : "NotificationTopic" },
        "NotificationTypes" : [ "autoscaling:EC2_INSTANCE_LAUNCH","autoscaling:EC2_INSTANCE_LAUNCH_ERROR","autoscaling:EC2_INSTANCE_TERMINATE", "autoscaling:EC2_INSTANCE_TERMINATE_ERROR"]          
      }
    }           
  },
  </code></pre>
  
  <p>Currently I am getting errors where <code>The availability zone [us-west-1a] is not legal</code>  Thanks!</p>