title: Cannot create a new RDS database on AWS Elastic Beanstalk
body: <p>After using <code>eb create</code> to create a new environment, I am unable to create a new RDS database inside my environment using AWS console. It required me to select at least at least two availability zones from a list of four.</p>
  
  <p>whichever I select I get the error:</p>
  
  <blockquote>
    <p>DBSubnets: Invalid option value: '["subnet-3dbb9564","subnet-b2edb199"]' (Namespace: 'aws:ec2:vpc', OptionName: 'DBSubnets'): Specify the VPC ID and make sure all subnets exist.</p>
  </blockquote>
  
  <p>Using EB CLI with the following command <code>eb create --database.engine postgres</code>, I get a timeout.</p>
  
  <pre><code>Environment details for: iod-test
    Application name: image_of_day2
    Region: us-east-1
    Deployed Version: 642b
    Environment ID: e-u7q9j5ft2e
    Platform: 64bit Amazon Linux 2015.03 v2.0.1 running Python 2.7
    Tier: WebServer-Standard
    CNAME: iotd-test2.elasticbeanstalk.com
    Updated: 2015-09-21 19:29:37.262000+00:00
  Printing Status:
  INFO: createEnvironment is starting.
  INFO: Using elasticbeanstalk-us-east-1-249541483051 as Amazon S3 storage bucket for environment data.
  INFO: Created security group named: sg-7e948419
  INFO: Environment health has transitioned to Pending. There are no instances.
  INFO: Created security group named: awseb-e-u7q9j5ft2e-stack-AWSEBSecurityGroup-D0EHQ2UNQQWH
  INFO: Created Auto Scaling launch configuration named: awseb-e-u7q9j5ft2e-stack-AWSEBAutoScalingLaunchConfiguration-FQZXDALSR4Z6
  INFO: Created RDS database security group named: awseb-e-u7q9j5ft2e-stack-awsebrdsdbsecuritygroup-1xo7y4uzxrwgx
  INFO: Creating RDS database named: aaaqgf0bktrtyg. This may take a few minutes.
  
  ERROR: The operation timed out. The state of the environment is unknown.
  </code></pre>
  
  <p>What other options do I have. Is this a problem from AWS side?</p>