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: 
  == Installation via CloudFormation
  
  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:
  
negative.code: ** `3`: up to 50,000 subscriptions
  ** `4`: beyond 50,000 subscriptions
  * *KauiServerCapacity:* the initial number of Kaui instances in the Auto Scaling group. We recommend using the default value `2`.
  * *KBAdminPassword:* the `admin` password that will be used for the default `root` user which has all the permissions. By default such password is set to `password`. Typically, one would use the `root` user to create additional roles (along with their permissions) to limit the scope of what specific applications or users can do. See our https://docs.killbill.io/latest/user_management.html[User Management Documentation].
  * *DBClass:* the database instance type to use for RDS. Here are some guidelines:
  ** `db.t3.medium`: test environment
  ** `db.r5.xlarge`: up to 5,000 subscriptions
  