anchor.diff:  
   Multiple instances of KAUI and the Kill Bill server are deployed in the VPC, each running on its own Ubuntu Linux server. AWS autoscaling is used to increase and decrease the number of instances of each package as needed.
   
  -Access to these instances is managed by an AWS *Elastic Load Balancer (ELB)*. The ELB routes each request to the correct package and distributes the requests across the available instances. The ELB will listen on port 80 for routing traffic to the Kill Bill instances, and on port 9090 for accessing KAUI.
  -
  -
  -The elastic load balancer will listen on port 80 for routing traffic to our Kill Bill server instances, and on port 9090 for accessing KAUI, our admin UI. Internally, both Kill Bill server instances, and KAUI server instances will listen on port 8080. These ports will be different if HTTPS is used (see below).
  +Access to these instances is managed by an AWS *Elastic Load Balancer (ELB)*. The ELB routes each request to the correct package and distributes the requests across the available instances. The ELB accepts traffic using HTTP by default, but we recommend upgrading to HTTPS for higher security (see below). Using HTTP, the ELB will listen on port 80 for routing traffic to the Kill Bill instances, and on port 9090 for accessing KAUI.
   
   The back end of the system is an *Aurora* database manager provided through the AWS *Relational Database System (RDS)*. Aurora is a robust database system developed by AWS, compatible with MySQL and Postgres. There are separate databases maintained for Kill Bill and KAUI.
   
  
positive.code: Congratulations! Your CloudFormation installation is ready to go!
  
  
  == TroubleShooting Section
  
  === Stack Creation
  
  There are a couple of possible issues when starting the stack from CloudFormation (CFN). The goal of this section
  is to provide some tips debugging the issues, and knowledge about where to find various logs. Also keep in mind
  that starting the CFN stack will typically take in the order of 15-20 minutes, mostly because of the time it takes to setup the 
  RDS cluster, so be patient...
  
negative.code: The Kill Bill core team will provide new AMIs whenever necessary.
  
  Because the CloudFormation from AWS Marketplace will always reflect the latest AMI ids, you can simply update the stack with the latest CloudFormation template and the instances in the AutoScaling groups will be updated automatically.
  We strongly recommend that you always test the upgrade in a test environment first.
  
  We recommend that you rely on the CloudFormation `ChangeSet` functionality to get a sense of what would be updated if the change was submitted. For more information about the CloudFormation `ChangeSet` functionality see this https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks.html[documentation]. Below is a summary of the steps:
  
  [1]. Update your CloudFormation template with the new Kill Bill and/or KAUI AMIs
  
  