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Showing content from https://docs.aws.amazon.com/eks/latest/userguide/creating-a-vpc.html below:

Create an Amazon VPC for your Amazon EKS cluster

You can use Amazon Virtual Private Cloud (Amazon VPC) to launch AWS resources into a virtual network that you’ve defined. This virtual network closely resembles a traditional network that you might operate in your own data center. However, it comes with the benefits of using the scalable infrastructure of Amazon Web Services. We recommend that you have a thorough understanding of the Amazon VPC service before deploying production Amazon EKS clusters. For more information, see the Amazon VPC User Guide.

An Amazon EKS cluster, nodes, and Kubernetes resources are deployed to a VPC. If you want to use an existing VPC with Amazon EKS, that VPC must meet the requirements that are described in View Amazon EKS networking requirements for VPC and subnets. This topic describes how to create a VPC that meets Amazon EKS requirements using an Amazon EKS provided AWS CloudFormation template. Once you’ve deployed a template, you can view the resources created by the template to know exactly what resources it created, and the configuration of those resources. If you are using hybrid nodes, your VPC must have routes in its route table for your on-premises network. For more information about the network requirements for hybrid nodes, see Prepare networking for hybrid nodes.

To create a VPC for Amazon EKS, you must have the necessary IAM permissions to create Amazon VPC resources. These resources are VPCs, subnets, security groups, route tables and routes, and internet and NAT gateways. For more information, see Create a VPC with a public subnet example policy in the Amazon VPC User Guide and the full list of Actions in the Service Authorization Reference.

You can create a VPC with public and private subnets, only public subnets, or only private subnets.

This VPC has two public and two private subnets. A public subnet’s associated route table has a route to an internet gateway. However, the route table of a private subnet doesn’t have a route to an internet gateway. One public and one private subnet are deployed to the same Availability Zone. The other public and private subnets are deployed to a second Availability Zone in the same AWS Region. We recommend this option for most deployments.

With this option, you can deploy your nodes to private subnets. This option allows Kubernetes to deploy load balancers to the public subnets that can load balance traffic to Pods that run on nodes in the private subnets. Public IPv4 addresses are automatically assigned to nodes that are deployed to public subnets, but public IPv4 addresses aren’t assigned to nodes deployed to private subnets.

You can also assign IPv6 addresses to nodes in public and private subnets. The nodes in private subnets can communicate with the cluster and other AWS services. Pods can communicate to the internet through a NAT gateway using IPv4 addresses or outbound-only Internet gateway using IPv6 addresses deployed in each Availability Zone. A security group is deployed that has rules that deny all inbound traffic from sources other than the cluster or nodes but allows all outbound traffic. The subnets are tagged so that Kubernetes can deploy load balancers to them.

1. Open the AWS CloudFormation console.

2. From the navigation bar, select an AWS Region that supports Amazon EKS.

3. Choose Create stack, With new resources (standard).

4. Under Prerequisite - Prepare template, make sure that Template is ready is selected and then under Specify template, select Amazon S3 URL.

5. You can create a VPC that supports only IPv4, or a VPC that supports IPv4 and IPv6. Paste one of the following URLs into the text area under Amazon S3 URL and choose Next:

https://s3.us-west-2.amazonaws.com/amazon-eks/cloudformation/2020-10-29/amazon-eks-vpc-private-subnets.yaml

https://s3.us-west-2.amazonaws.com/amazon-eks/cloudformation/2020-10-29/amazon-eks-ipv6-vpc-public-private-subnets.yaml

1. On the Specify stack details page, enter the parameters, and then choose Next.

   • Stack name: Choose a stack name for your AWS CloudFormation stack. For example, you can use the template name you used in the previous step. The name can contain only alphanumeric characters (case-sensitive) and hyphens. It must start with an alphanumeric character and can’t be longer than 100 characters. The name must be unique within the AWS Region and AWS account that you’re creating the cluster in.

   • VpcBlock: Choose an IPv4 CIDR range for your VPC. Each node, Pod, and load balancer that you deploy is assigned an IPv4 address from this block. The default IPv4 values provide enough IP addresses for most implementations, but if it doesn’t, then you can change it. For more information, see VPC and subnet sizing in the Amazon VPC User Guide. You can also add additional CIDR blocks to the VPC once it’s created. If you’re creating an IPv6 VPC, IPv6 CIDR ranges are automatically assigned for you from Amazon’s Global Unicast Address space.

   • PublicSubnet01Block: Specify an IPv4 CIDR block for public subnet 1. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it. If you’re creating an IPv6 VPC, this block is specified for you within the template.

   • PublicSubnet02Block: Specify an IPv4 CIDR block for public subnet 2. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it. If you’re creating an IPv6 VPC, this block is specified for you within the template.

   • PrivateSubnet01Block: Specify an IPv4 CIDR block for private subnet 1. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it. If you’re creating an IPv6 VPC, this block is specified for you within the template.

   • PrivateSubnet02Block: Specify an IPv4 CIDR block for private subnet 2. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it. If you’re creating an IPv6 VPC, this block is specified for you within the template.

2. (Optional) On the Configure stack options page, tag your stack resources and then choose Next.

3. On the Review page, choose Create stack.

4. When your stack is created, select it in the console and choose Outputs.

5. Record the VpcId for the VPC that was created. You need this when you create your cluster and nodes.

6. Record the SubnetIds for the subnets that were created and whether you created them as public or private subnets. You need at least two of these when you create your cluster and nodes.

7. If you created an IPv4 VPC, skip this step. If you created an IPv6 VPC, you must enable the auto-assign IPv6 address option for the public subnets that were created by the template. That setting is already enabled for the private subnets. To enable the setting, complete the following steps:

   1. Open the Amazon VPC console at https://console.aws.amazon.com/vpc/.

   2. In the left navigation pane, choose Subnets

   3. Select one of your public subnets ( stack-name/SubnetPublic01 or stack-name/SubnetPublic02 contains the word public) and choose Actions, Edit subnet settings.

   4. Choose the Enable auto-assign IPv6 address check box and then choose Save.

   5. Complete the previous steps again for your other public subnet.

This VPC has three public subnets that are deployed into different Availability Zones in an AWS Region. All nodes are automatically assigned public IPv4 addresses and can send and receive internet traffic through an internet gateway. A security group is deployed that denies all inbound traffic and allows all outbound traffic. The subnets are tagged so that Kubernetes can deploy load balancers to them.

1. Open the AWS CloudFormation console.

2. From the navigation bar, select an AWS Region that supports Amazon EKS.

3. Choose Create stack, With new resources (standard).

4. Under Prepare template, make sure that Template is ready is selected and then under Template source, select Amazon S3 URL.

5. Paste the following URL into the text area under Amazon S3 URL and choose Next:

https://s3.us-west-2.amazonaws.com/amazon-eks/cloudformation/2020-10-29/amazon-eks-vpc-sample.yaml

1. On the Specify Details page, enter the parameters, and then choose Next.

   • Stack name: Choose a stack name for your AWS CloudFormation stack. For example, you can call it amazon-eks-vpc-sample. The name can contain only alphanumeric characters (case-sensitive) and hyphens. It must start with an alphanumeric character and can’t be longer than 100 characters. The name must be unique within the AWS Region and AWS account that you’re creating the cluster in.

   • VpcBlock: Choose a CIDR block for your VPC. Each node, Pod, and load balancer that you deploy is assigned an IPv4 address from this block. The default IPv4 values provide enough IP addresses for most implementations, but if it doesn’t, then you can change it. For more information, see VPC and subnet sizing in the Amazon VPC User Guide. You can also add additional CIDR blocks to the VPC once it’s created.

   • Subnet01Block: Specify a CIDR block for subnet 1. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it.

   • Subnet02Block: Specify a CIDR block for subnet 2. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it.

   • Subnet03Block: Specify a CIDR block for subnet 3. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it.

2. (Optional) On the Options page, tag your stack resources. Choose Next.

3. On the Review page, choose Create.

4. When your stack is created, select it in the console and choose Outputs.

5. Record the VpcId for the VPC that was created. You need this when you create your cluster and nodes.

6. Record the SubnetIds for the subnets that were created. You need at least two of these when you create your cluster and nodes.

7. (Optional) Any cluster that you deploy to this VPC can assign private IPv4 addresses to your Pods and services. If you want to deploy clusters to this VPC to assign private IPv6 addresses to your Pods and services, make updates to your VPC, subnet, route tables, and security groups. For more information, see Migrate existing VPCs from IPv4 to IPv6 in the Amazon VPC User Guide. Amazon EKS requires that your subnets have the Auto-assign IPv6 addresses option enabled. By default, it’s disabled.

This VPC has three private subnets that are deployed into different Availability Zones in the AWS Region. Resources that are deployed to the subnets can’t access the internet, nor can the internet access resources in the subnets. The template creates VPC endpoints using AWS PrivateLink for several AWS services that nodes typically need to access. If your nodes need outbound internet access, you can add a public NAT gateway in the Availability Zone of each subnet after the VPC is created. A security group is created that denies all inbound traffic, except from resources deployed into the subnets. A security group also allows all outbound traffic. The subnets are tagged so that Kubernetes can deploy internal load balancers to them. If you’re creating a VPC with this configuration, see Deploy private clusters with limited internet access for additional requirements and considerations.

1. Open the AWS CloudFormation console.

2. From the navigation bar, select an AWS Region that supports Amazon EKS.

3. Choose Create stack, With new resources (standard).

4. Under Prepare template, make sure that Template is ready is selected and then under Template source, select Amazon S3 URL.

5. Paste the following URL into the text area under Amazon S3 URL and choose Next:

https://s3.us-west-2.amazonaws.com/amazon-eks/cloudformation/2020-10-29/amazon-eks-fully-private-vpc.yaml

1. On the Specify Details page, enter the parameters and then choose Next.

   • Stack name: Choose a stack name for your AWS CloudFormation stack. For example, you can call it amazon-eks-fully-private-vpc. The name can contain only alphanumeric characters (case-sensitive) and hyphens. It must start with an alphanumeric character and can’t be longer than 100 characters. The name must be unique within the AWS Region and AWS account that you’re creating the cluster in.

   • VpcBlock: Choose a CIDR block for your VPC. Each node, Pod, and load balancer that you deploy is assigned an IPv4 address from this block. The default IPv4 values provide enough IP addresses for most implementations, but if it doesn’t, then you can change it. For more information, see VPC and subnet sizing in the Amazon VPC User Guide. You can also add additional CIDR blocks to the VPC once it’s created.

   • PrivateSubnet01Block: Specify a CIDR block for subnet 1. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it.

   • PrivateSubnet02Block: Specify a CIDR block for subnet 2. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it.

   • PrivateSubnet03Block: Specify a CIDR block for subnet 3. The default value provides enough IP addresses for most implementations, but if it doesn’t, then you can change it.

2. (Optional) On the Options page, tag your stack resources. Choose Next.

3. On the Review page, choose Create.

4. When your stack is created, select it in the console and choose Outputs.

5. Record the VpcId for the VPC that was created. You need this when you create your cluster and nodes.

6. Record the SubnetIds for the subnets that were created. You need at least two of these when you create your cluster and nodes.

7. (Optional) Any cluster that you deploy to this VPC can assign private IPv4 addresses to your Pods and services. If you want deploy clusters to this VPC to assign private IPv6 addresses to your Pods and services, make updates to your VPC, subnet, route tables, and security groups. For more information, see Migrate existing VPCs from IPv4 to IPv6 in the Amazon VPC User Guide. Amazon EKS requires that your subnets have the Auto-assign IPv6 addresses option enabled (it’s disabled by default).

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