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The combined Terraform file for creating a very simple EKS cluster
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variable "cluster-name" { | |
default = "terraform-eks-demo" | |
type = string | |
} | |
# This data source is included for ease of sample architecture deployment | |
# and can be swapped out as necessary. | |
data "aws_availability_zones" "available" {} | |
resource "aws_vpc" "demo" { | |
cidr_block = "10.0.0.0/16" | |
enable_dns_hostnames = true | |
tags = map( | |
"Name", "terraform-eks-demo-node", | |
"kubernetes.io/cluster/${var.cluster-name}", "shared", | |
) | |
} | |
resource "aws_subnet" "demo" { | |
count = 3 | |
availability_zone = data.aws_availability_zones.available.names[count.index] | |
cidr_block = "10.0.${count.index}.0/24" | |
vpc_id = aws_vpc.demo.id | |
tags = map( | |
"Name", "terraform-eks-demo-node", | |
"kubernetes.io/cluster/${var.cluster-name}", "shared", | |
) | |
} | |
resource "aws_internet_gateway" "demo" { | |
vpc_id = aws_vpc.demo.id | |
tags = { | |
Name = "terraform-eks-demo" | |
} | |
} | |
resource "aws_route_table" "demo" { | |
vpc_id = aws_vpc.demo.id | |
route { | |
cidr_block = "0.0.0.0/0" | |
gateway_id = aws_internet_gateway.demo.id | |
} | |
} | |
resource "aws_route_table_association" "demo" { | |
count = 3 | |
subnet_id = aws_subnet.demo.*.id[count.index] | |
route_table_id = aws_route_table.demo.id | |
} | |
resource "aws_iam_role" "demo-cluster" { | |
name = "terraform-eks-demo-cluster" | |
assume_role_policy = <<POLICY | |
{ | |
"Version": "2012-10-17", | |
"Statement": [ | |
{ | |
"Effect": "Allow", | |
"Principal": { | |
"Service": "eks.amazonaws.com" | |
}, | |
"Action": "sts:AssumeRole" | |
} | |
] | |
} | |
POLICY | |
} | |
resource "aws_iam_role_policy_attachment" "demo-cluster-AmazonEKSClusterPolicy" { | |
policy_arn = "arn:aws:iam::aws:policy/AmazonEKSClusterPolicy" | |
role = aws_iam_role.demo-cluster.name | |
} | |
resource "aws_iam_role_policy_attachment" "demo-cluster-AmazonEKSServicePolicy" { | |
policy_arn = "arn:aws:iam::aws:policy/AmazonEKSServicePolicy" | |
role = aws_iam_role.demo-cluster.name | |
} | |
resource "aws_security_group" "demo-cluster" { | |
name = "terraform-eks-demo-cluster" | |
description = "Cluster communication with worker nodes" | |
vpc_id = aws_vpc.demo.id | |
egress { | |
from_port = 0 | |
to_port = 0 | |
protocol = "-1" | |
cidr_blocks = [ | |
"0.0.0.0/0"] | |
} | |
tags = { | |
Name = "terraform-eks-demo" | |
} | |
} | |
resource "aws_security_group_rule" "demo-cluster-ingress-workstation-https" { | |
cidr_blocks = ["0.0.0.0/0"] | |
description = "Allow workstation to communicate with the cluster API Server" | |
from_port = 443 | |
protocol = "tcp" | |
security_group_id = aws_security_group.demo-cluster.id | |
to_port = 443 | |
type = "ingress" | |
} | |
resource "aws_eks_cluster" "demo" { | |
name = var.cluster-name | |
role_arn = aws_iam_role.demo-cluster.arn | |
vpc_config { | |
security_group_ids = [aws_security_group.demo-cluster.id] | |
subnet_ids = aws_subnet.demo.*.id | |
} | |
depends_on = [ | |
aws_iam_role_policy_attachment.demo-cluster-AmazonEKSClusterPolicy, | |
aws_iam_role_policy_attachment.demo-cluster-AmazonEKSServicePolicy, | |
] | |
} | |
locals { | |
kubeconfig = <<KUBECONFIG | |
apiVersion: v1 | |
clusters: | |
- cluster: | |
server: ${aws_eks_cluster.demo.endpoint} | |
certificate-authority-data: ${aws_eks_cluster.demo.certificate_authority.0.data} | |
name: kubernetes | |
contexts: | |
- context: | |
cluster: kubernetes | |
user: aws | |
name: aws | |
current-context: aws | |
kind: Config | |
preferences: {} | |
users: | |
- name: aws | |
user: | |
exec: | |
apiVersion: client.authentication.k8s.io/v1alpha1 | |
command: aws-iam-authenticator | |
args: | |
- "token" | |
- "-i" | |
- "${var.cluster-name}" | |
KUBECONFIG | |
} | |
output "kubeconfig" { | |
value = local.kubeconfig | |
} | |
resource "aws_iam_role" "demo-node" { | |
name = "terraform-eks-demo-node" | |
assume_role_policy = <<POLICY | |
{ | |
"Version": "2012-10-17", | |
"Statement": [ | |
{ | |
"Effect": "Allow", | |
"Principal": { | |
"Service": "ec2.amazonaws.com" | |
}, | |
"Action": "sts:AssumeRole" | |
} | |
] | |
} | |
POLICY | |
} | |
resource "aws_iam_role_policy_attachment" "demo-node-AmazonEKSWorkerNodePolicy" { | |
policy_arn = "arn:aws:iam::aws:policy/AmazonEKSWorkerNodePolicy" | |
role = aws_iam_role.demo-node.name | |
} | |
resource "aws_iam_role_policy_attachment" "demo-node-AmazonEKS_CNI_Policy" { | |
policy_arn = "arn:aws:iam::aws:policy/AmazonEKS_CNI_Policy" | |
role = aws_iam_role.demo-node.name | |
} | |
resource "aws_iam_role_policy_attachment" "demo-node-AmazonEC2ContainerRegistryReadOnly" { | |
policy_arn = "arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly" | |
role = aws_iam_role.demo-node.name | |
} | |
resource "aws_iam_instance_profile" "demo-node" { | |
name = "terraform-eks-demo" | |
role = aws_iam_role.demo-node.name | |
} | |
resource "aws_security_group" "demo-node" { | |
name = "terraform-eks-demo-node" | |
description = "Security group for all nodes in the cluster" | |
vpc_id = aws_vpc.demo.id | |
egress { | |
from_port = 0 | |
to_port = 0 | |
protocol = "-1" | |
cidr_blocks = [ | |
"0.0.0.0/0"] | |
} | |
tags = map( | |
"Name", "terraform-eks-demo-node", | |
"kubernetes.io/cluster/${var.cluster-name}", "owned", | |
) | |
} | |
resource "aws_security_group_rule" "demo-node-ingress-self" { | |
description = "Allow node to communicate with each other" | |
from_port = 0 | |
protocol = "-1" | |
security_group_id = aws_security_group.demo-node.id | |
source_security_group_id = aws_security_group.demo-node.id | |
to_port = 65535 | |
type = "ingress" | |
} | |
resource "aws_security_group_rule" "demo-node-ingress-cluster" { | |
description = "Allow worker Kubelets and pods to receive communication from the cluster control plane" | |
from_port = 1025 | |
protocol = "tcp" | |
security_group_id = aws_security_group.demo-node.id | |
source_security_group_id = aws_security_group.demo-cluster.id | |
to_port = 65535 | |
type = "ingress" | |
} | |
resource "aws_security_group_rule" "demo-cluster-ingress-node-https" { | |
description = "Allow pods to communicate with the cluster API Server" | |
from_port = 443 | |
protocol = "tcp" | |
security_group_id = aws_security_group.demo-node.id | |
source_security_group_id = aws_security_group.demo-cluster.id | |
to_port = 443 | |
type = "ingress" | |
} | |
data "aws_ami" "eks-worker" { | |
filter { | |
name = "name" | |
values = [ | |
"amazon-eks-node-${aws_eks_cluster.demo.version}-v*"] | |
} | |
most_recent = true | |
owners = [ | |
"602401143452"] | |
# Amazon EKS AMI Account ID | |
} | |
# This data source is included for ease of sample architecture deployment | |
# and can be swapped out as necessary. | |
data "aws_region" "current" {} | |
# EKS currently documents this required userdata for EKS worker nodes to | |
# properly configure Kubernetes applications on the EC2 instance. | |
# We implement a Terraform local here to simplify Base64 encoding this | |
# information into the AutoScaling Launch Configuration. | |
# More information: https://docs.aws.amazon.com/eks/latest/userguide/launch-workers.html | |
locals { | |
demo-node-userdata = <<USERDATA | |
#!/bin/bash | |
set -o xtrace | |
/etc/eks/bootstrap.sh --apiserver-endpoint '${aws_eks_cluster.demo.endpoint}' --b64-cluster-ca '${aws_eks_cluster.demo.certificate_authority.0.data}' '${var.cluster-name}' | |
USERDATA | |
} | |
resource "aws_launch_configuration" "demo" { | |
associate_public_ip_address = true | |
iam_instance_profile = aws_iam_instance_profile.demo-node.name | |
image_id = data.aws_ami.eks-worker.id | |
instance_type = "m4.large" | |
name_prefix = "terraform-eks-demo" | |
security_groups = [ | |
aws_security_group.demo-node.id] | |
user_data_base64 = base64encode(local.demo-node-userdata) | |
lifecycle { | |
create_before_destroy = true | |
} | |
} | |
resource "aws_autoscaling_group" "demo" { | |
desired_capacity = 2 | |
launch_configuration = aws_launch_configuration.demo.id | |
max_size = 2 | |
min_size = 1 | |
name = "terraform-eks-demo" | |
vpc_zone_identifier = aws_subnet.demo.*.id | |
tag { | |
key = "Name" | |
value = "terraform-eks-demo" | |
propagate_at_launch = true | |
} | |
tag { | |
key = "kubernetes.io/cluster/${var.cluster-name}" | |
value = "owned" | |
propagate_at_launch = true | |
} | |
} | |
locals { | |
config_map_aws_auth = <<CONFIGMAPAWSAUTH | |
apiVersion: v1 | |
kind: ConfigMap | |
metadata: | |
name: aws-auth | |
namespace: kube-system | |
data: | |
mapRoles: | | |
- rolearn: ${aws_iam_role.demo-node.arn} | |
username: system:node:{{EC2PrivateDNSName}} | |
groups: | |
- system:bootstrappers | |
- system:nodes | |
CONFIGMAPAWSAUTH | |
} | |
output "config_map_aws_auth" { | |
value = local.config_map_aws_auth | |
} |
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