The {product-title} cluster uses a number of Amazon Web Services (AWS) components, and the default link:https://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html[service limits] affect your ability to install {product-title} clusters. If you use certain cluster configurations, deploy your cluster in certain AWS regions, or run multiple clusters from your account, you might need to request additional resources for your AWS account.
The following table summarizes the AWS components whose limits can impact your ability to install and run {product-title} clusters.
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|Component |Number of clusters available by default| Default AWS limit |Description
These instance type counts are within a new account's default limit. To deploy more worker nodes, deploy large workloads, or use a different instance type, review your account limits to ensure that your cluster can deploy the machines that you need.
In most regions, the bootstrap and worker machines uses an `m4.large` machines and the control plane machines use `m4.xlarge` instances. In some regions, including all regions that do not support these instance types, `m5.large` and `m5.xlarge` instances are used instead.
|To provision the cluster in a highly available configuration, the installation program creates a public and private subnet for each link:https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html[availability zone within a region]. Each private subnet requires a link:https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html[NAT Gateway], and each NAT gateway requires a separate
link:https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ipaddresses-eip.html[elastic IP]. Review the link:https://aws.amazon.com/about-aws/global-infrastructure/[AWS region map] to determine how many availability zones are in each region. To take advantage of the default high availability, install the cluster in a region with at least three availability zones. To install a cluster in a region with more than five availability zones, you must increase the EIP limit.
// TODO: The above elastic IP link is redirected. Find new link. Is it https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html ?
[IMPORTANT]
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To use the `us-east-1` region, you must increase the EIP limit for your account.
|By default, each cluster creates internal and external Network Load Balancers for the primary API server and a single Classic Load Balancer for the router. Deploying more Kubernetes LoadBalancer Service objects will create additional link:https://aws.amazon.com/elasticloadbalancing/[load balancers].
|The cluster deploys one NAT gateway in each availability zone.
|Elastic Network Interfaces (ENIs)
|At least 12
|350 per region
|The default installation creates 21 ENIs and an ENI for each availability zone in your region. For example, the `us-east-1` region contains six availability zones, so a cluster that is deployed in that zone uses 27 ENIs. Review the link:https://aws.amazon.com/about-aws/global-infrastructure/[AWS region map] to determine how many availability zones are in each region.
|Each cluster creates a single VPC Gateway for S3 access.
|S3 buckets
|99
|100 buckets per account
|Because the installation process creates a temporary bucket and the registry component in each cluster creates a bucket, you can create only 99 {product-title} clusters per AWS account.
