title: Configuration of EC2 AMI
body: <p>it is said after we configure a system in an EC2, we can create EC2 AMI of that, then later on we use the AMI for auto scaling, fail over, etc. But usually the configuration will set something related to the specific information of the EC2, such as IP address, etc. creating EC2 AMI to a new EC2 will setup the old IP to the new EC2 which does not make sense.</p>
  
  <p>So how is EC2 AMI use is this case? Do we need some additional steps to modify the configuration? is it how people use the AMI?  </p>