anchor.diff:  The installation supports the following configuration options:
   
   * *VpcId:* the VPC to use for the installation. In your AWS Console, go to *Services* and search for *VPC*. Under *Your VPCs*, locate the VPC ID you would like to use or create a new one.
  -* *Subnets:* the subnets to use, associated with at least two different availability zones. In the VPC Dashboard, go to *Subnets* and find two subnets in your VPC *in two different availability zones*. Alternatively, create new ones (use 10.0.0.0/24 and 10.0.1.0/24 as the IPv4 CIDR for instance).
  +* *Subnets:* the subnets to use for the KB and KAUi instances. They should be associated with at least two different availability zones. In the VPC Dashboard, go to *Subnets* and find two subnets in your VPC *in two different availability zones*. Alternatively, create new ones (use 10.0.0.0/24 and 10.0.1.0/24 as the IPv4 CIDR for instance).
  +* *RDSSubnets:* the subnets to use for the RDS instance. The RDS instances require a subnet group with at least two different availability zones.
   * *KeyName:* name of an existing EC2 KeyPair to enable SSH access to the instances. You can create a new one by going to *Key Pairs* in your EC2 Dashboard.
   * *HTTPLocation:* IP address range allowed to access the load balancer (you can always use 0.0.0.0/0 initially and adjust access later on).
   * *EnvType:* environment purpose (test, prod, etc.)
   * *InstanceType:* the EC2 instance type to use for Kill Bill. Here are some guidelines:
  -** `m5.large`: test environment
  -** `c5.xlarge`: up to 5,000 subscriptions
  +** `t2.medium` -> `t2.xlarge`: test environment
  +** `m5.large`: up to 5,000 subscriptions
   ** `c5.2xlarge`: up to 50,000 subscriptions
   ** `c5.4xlarge`: beyond 50,000 subscriptions
   * *KillBillServerCapacity:* the initial number of Kill Bill instances in the Auto Scaling group. Here are some guidelines:
  
positive.code: * A load balancer, integrated with our internal healthchecks to promptly take out of rotation unhealthy instances
  * A RDS Aurora Cluster with automatic failover
  
  image:https://github.com/killbill/killbill-docs/raw/v3/userguide/assets/img/aws/cloudwatch.png[align=center]
  
  By installating additional plugins suchs as our free Analytics plugin, you get a subscription billing management solution as feature-rich as popular SaaS platforms, but you are in control.
  
  
  image:https://github.com/killbill/killbill-docs/raw/v3/userguide/assets/img/aws/analytics.png[align=center]
  
  
  For installation support along the way, reach out to `support@killbill.io`.
  
negative.code: 
  == Installation via CloudFormation
  
  === Overview of the Stack
  
  Running Kill Bill on AWS using our +++<a href="https://aws.amazon.com/marketplace/pp/prodview-nochv5omslmds?ref=_ptnr_doc_" onclick="getOutboundLink('https://aws.amazon.com/marketplace/pp/prodview-nochv5omslmds?ref=_ptnr_doc_'); return false;">official CloudFormation template</a>+++ is the easiest and fastest way to get started with a production cluster. *It is also the only method of installation that is certified by the core developers for a Highly Available, horizontally scalable and production-ready installation.*
  
  With the click of a button, the template will install and configure:
  