Terraform EKS submodule: eks managed node groups

Terraform EKS module: eks_managed_node_groups

• Submodule: https://registry.terraform.io/modules/terraform-aws-modules/eks/aws/latest/submodules/eks-managed-node-group
• Input: https://registry.terraform.io/modules/terraform-aws-modules/eks/aws/latest#input_eks_managed_node_groups
• Example: https://registry.terraform.io/modules/terraform-aws-modules/eks/aws/latest/examples/eks_managed_node_group

• instance_types: min_size, max_size, desired_size
• use_custom_launch_template
• fargate_profiles
• eks_managed_node_group_defaults

Examples

eks_managed_node_groups = {
  one = {
    name = "node-group-1"

    instance_types = ["t3.small"]

    min_size     = 1
    max_size     = 3
    desired_size = 2       # https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/docs/faq.md#why-are-there-no-changes-when-a-node-groups-desired_size-is-modified

    pre_bootstrap_user_data = <<-EOT
    echo 'foo bar'
    EOT

    vpc_security_group_ids = [
      aws_security_group.node_group_one.id
    ]
  }

  two = {
    name = "node-group-2"

    instance_types = ["t3.medium"]

    min_size     = 1
    max_size     = 2
    desired_size = 1
 
    pre_bootstrap_user_data = <<-EOT
    echo 'foo bar'
    EOT

    vpc_security_group_ids = [
      aws_security_group.node_group_two.id
    ]
  }
}

module "eks_managed_node_group" {
 source = "terraform-aws-modules/eks/aws//modules/eks-managed-node-group"

 name            = "separate-eks-mng"
 cluster_name    = "my-cluster"
 cluster_version = "1.24"

 subnet_ids = ["subnet-abcde012", "subnet-bcde012a", "subnet-fghi345a"]

 // The following variables are necessary if you decide to use the module outside of the parent EKS module context.
 // Without it, the security groups of the nodes are empty and thus won't join the cluster.
 cluster_primary_security_group_id = module.eks.cluster_primary_security_group_id
 vpc_security_group_ids            = [module.eks.node_security_group_id]

 // Note: `disk_size`, and `remote_access` can only be set when using the EKS managed node group default launch template
 // This module defaults to providing a custom launch template to allow for custom security groups, tag propagation, etc.
 // use_custom_launch_template = false
 // disk_size = 50
 //
 //  # Remote access cannot be specified with a launch template
 //  remote_access = {
 //    ec2_ssh_key               = module.key_pair.key_pair_name
 //    source_security_group_ids = [aws_security_group.remote_access.id]
 //  }

 min_size     = 1
 max_size     = 10
 desired_size = 1

 instance_types = ["t3.large"]
 capacity_type  = "SPOT"

 labels = {
   Environment = "test"
   GithubRepo  = "terraform-aws-eks"
   GithubOrg   = "terraform-aws-modules"
 }
 
 taints = {
   dedicated = {
     key    = "dedicated"
     value  = "gpuGroup"
     effect = "NO_SCHEDULE"
   }
 }
 
 tags = {
   Environment = "dev"
   Terraform   = "true"
 }
 }

Errors

│ Error: error updating EKS Node Group (your-ng:node_default-20230320234324234001) config: InvalidParameterException: Minimum capacity 2 can't be greater than desired size 1

Related

• eks-cluster.tf
• FAQ: https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/docs/faq.md#why-are-there-no-changes-when-a-node-groups-desired_size-is-modified
• taints
• Terraform resource: eks_managed_node_group
• Terraform submodule

See also

• eks_managed_node_groups: desired_size, min_size, max_size, use_custom_launch_template
• Terraform EKS module: manage_aws_auth_configmap, create_aws_auth_configmap, aws_auth_roles, aws_auth_users, aws_auth_accounts, module.eks, Amazon EKS Blueprints for Terraform, OIDC