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main.tf
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main.tf
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##########################
# Provider Configuration #
##########################
provider "aws" {
region = "${var.aws-region}"
}
resource "aws_key_pair" "k8s-key" {
key_name = "k8s-key"
# to allow ssh into the nodes, please adapt the path to your pub key below
public_key = "${file(var.public_key_path)}"
}
# Using these data sources allows the configuration to be
# generic for any region.
data "aws_region" "current" {}
data "aws_availability_zones" "available" {}
provider "http" {}
#################
# VPC Resources #
#################
resource "aws_vpc" "eks" {
cidr_block = "10.0.0.0/16"
tags = "${
map(
"Name", "${var.cluster-name}-eks-vpc",
"kubernetes.io/cluster/${var.cluster-name}", "shared",
)
}"
}
resource "aws_subnet" "eks" {
count = 2
availability_zone = "${data.aws_availability_zones.available.names[count.index]}"
cidr_block = "10.0.${count.index}.0/24"
vpc_id = "${aws_vpc.eks.id}"
tags = "${
map(
"Name", "${var.cluster-name}-eks",
"kubernetes.io/cluster/${var.cluster-name}", "shared",
)
}"
}
resource "aws_internet_gateway" "eks" {
vpc_id = "${aws_vpc.eks.id}"
tags {
Name = "${var.cluster-name}-eks-igw"
}
}
resource "aws_route_table" "eks" {
vpc_id = "${aws_vpc.eks.id}"
route {
cidr_block = "0.0.0.0/0"
gateway_id = "${aws_internet_gateway.eks.id}"
}
}
resource "aws_route_table_association" "eks" {
count = 2
subnet_id = "${aws_subnet.eks.*.id[count.index]}"
route_table_id = "${aws_route_table.eks.id}"
}
#########################
# EKS Cluster Resources #
#########################
resource "aws_iam_role" "cluster" {
name = "${var.cluster-name}-eks-cluster-role"
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" "cluster-AmazonEKSClusterPolicy" {
policy_arn = "arn:aws:iam::aws:policy/AmazonEKSClusterPolicy"
role = "${aws_iam_role.cluster.name}"
}
resource "aws_iam_role_policy_attachment" "cluster-AmazonEKSServicePolicy" {
policy_arn = "arn:aws:iam::aws:policy/AmazonEKSServicePolicy"
role = "${aws_iam_role.cluster.name}"
}
resource "aws_security_group" "cluster" {
name = "${var.cluster-name}-eks-cluster-sg"
description = "Cluster communication with worker nodes"
vpc_id = "${aws_vpc.eks.id}"
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
tags {
Name = "${var.cluster-name}-eks-cluster-sg"
}
}
resource "aws_security_group_rule" "cluster-ingress-node-https" {
description = "Allow pods to communicate with the cluster API Server"
from_port = 443
protocol = "tcp"
security_group_id = "${aws_security_group.cluster.id}"
source_security_group_id = "${aws_security_group.node.id}"
to_port = 443
type = "ingress"
}
resource "aws_security_group_rule" "cluster-ingress-workstation-https" {
cidr_blocks = ["${local.workstation-external-cidr}"]
description = "Allow workstation to communicate with the cluster API Server"
from_port = 443
protocol = "tcp"
security_group_id = "${aws_security_group.cluster.id}"
to_port = 443
type = "ingress"
}
resource "aws_eks_cluster" "eks" {
name = "${var.cluster-name}"
role_arn = "${aws_iam_role.cluster.arn}"
vpc_config {
security_group_ids = ["${aws_security_group.cluster.id}"]
subnet_ids = ["${aws_subnet.eks.*.id}"]
}
depends_on = [
"aws_iam_role_policy_attachment.cluster-AmazonEKSClusterPolicy",
"aws_iam_role_policy_attachment.cluster-AmazonEKSServicePolicy",
]
}
##############################
# EKS Worker Nodes Resources #
##############################
resource "aws_iam_role" "node" {
name = "${var.cluster-name}-eks-node-role"
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" "node-AmazonEKSWorkerNodePolicy" {
policy_arn = "arn:aws:iam::aws:policy/AmazonEKSWorkerNodePolicy"
role = "${aws_iam_role.node.name}"
}
resource "aws_iam_role_policy_attachment" "node-AmazonEKS_CNI_Policy" {
policy_arn = "arn:aws:iam::aws:policy/AmazonEKS_CNI_Policy"
role = "${aws_iam_role.node.name}"
}
resource "aws_iam_role_policy_attachment" "node-AmazonEC2ContainerRegistryReadOnly" {
policy_arn = "arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly"
role = "${aws_iam_role.node.name}"
}
resource "aws_iam_instance_profile" "node" {
name = "${var.cluster-name}-eks-node-instance-profile"
role = "${aws_iam_role.node.name}"
}
resource "aws_security_group" "node" {
name = "${var.cluster-name}-eks-node-sg"
description = "Security group for all nodes in the cluster"
vpc_id = "${aws_vpc.eks.id}"
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
# allow ssh into the nodes
ingress {
from_port = 22
to_port = 22
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
tags = "${
map(
"Name", "${var.cluster-name}-eks-node-sg",
"kubernetes.io/cluster/${var.cluster-name}", "owned",
)
}"
}
resource "aws_security_group_rule" "node-ingress-self" {
description = "Allow node to communicate with each other"
from_port = 0
protocol = "-1"
security_group_id = "${aws_security_group.node.id}"
source_security_group_id = "${aws_security_group.node.id}"
to_port = 65535
type = "ingress"
}
resource "aws_security_group_rule" "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 = "${aws_security_group.node.id}"
source_security_group_id = "${aws_security_group.cluster.id}"
to_port = 65535
type = "ingress"
}
data "aws_ami" "eks-worker-ami" {
filter {
name = "name"
values = ["amazon-eks-node-v*"]
}
most_recent = true
owners = ["602401143452"] # Amazon
}
# EKS currently documents this required userdata for EKS worker nodes to
# properly configure Kubernetes applications on the EC2 instance.
# We utilize a Terraform local here to simplify Base64 encoding this
# information into the AutoScaling Launch Configuration.
# More information: https://amazon-eks.s3-us-west-2.amazonaws.com/1.10.3/2018-06-05/amazon-eks-nodegroup.yaml
locals {
node-userdata = <<USERDATA
#!/bin/bash -xe
CA_CERTIFICATE_DIRECTORY=/etc/kubernetes/pki
CA_CERTIFICATE_FILE_PATH=$CA_CERTIFICATE_DIRECTORY/ca.crt
mkdir -p $CA_CERTIFICATE_DIRECTORY
echo "${aws_eks_cluster.eks.certificate_authority.0.data}" | base64 -d > $CA_CERTIFICATE_FILE_PATH
INTERNAL_IP=$(curl -s http://169.254.169.254/latest/meta-data/local-ipv4)
sed -i s,MASTER_ENDPOINT,${aws_eks_cluster.eks.endpoint},g /var/lib/kubelet/kubeconfig
sed -i s,CLUSTER_NAME,${var.cluster-name},g /var/lib/kubelet/kubeconfig
sed -i s,REGION,${data.aws_region.current.name},g /etc/systemd/system/kubelet.service
sed -i s,MAX_PODS,20,g /etc/systemd/system/kubelet.service
sed -i s,MASTER_ENDPOINT,${aws_eks_cluster.eks.endpoint},g /etc/systemd/system/kubelet.service
sed -i s,INTERNAL_IP,$INTERNAL_IP,g /etc/systemd/system/kubelet.service
DNS_CLUSTER_IP=10.100.0.10
if [[ $INTERNAL_IP == 10.* ]] ; then DNS_CLUSTER_IP=172.20.0.10; fi
sed -i s,DNS_CLUSTER_IP,$DNS_CLUSTER_IP,g /etc/systemd/system/kubelet.service
sed -i s,CERTIFICATE_AUTHORITY_FILE,$CA_CERTIFICATE_FILE_PATH,g /var/lib/kubelet/kubeconfig
sed -i s,CLIENT_CA_FILE,$CA_CERTIFICATE_FILE_PATH,g /etc/systemd/system/kubelet.service
systemctl daemon-reload
systemctl restart kubelet
USERDATA
}
resource "aws_launch_configuration" "eks" {
associate_public_ip_address = true
iam_instance_profile = "${aws_iam_instance_profile.node.name}"
image_id = "${data.aws_ami.eks-worker-ami.id}"
instance_type = "${var.node-instance-type}"
name_prefix = "${var.cluster-name}-eks-"
security_groups = ["${aws_security_group.node.id}"]
user_data_base64 = "${base64encode(local.node-userdata)}"
# to allow ssh into the nodes
key_name = "${aws_key_pair.k8s-key.key_name}"
lifecycle {
create_before_destroy = true
}
}
resource "aws_autoscaling_group" "eks" {
desired_capacity = "${var.desired-capacity}"
launch_configuration = "${aws_launch_configuration.eks.id}"
max_size = "${var.max-size}"
min_size = "${var.min-size}"
name = "${var.cluster-name}-eks-asg"
vpc_zone_identifier = ["${aws_subnet.eks.*.id}"]
tag {
key = "Name"
value = "${var.cluster-name}-eks-node"
propagate_at_launch = true
}
tag {
key = "kubernetes.io/cluster/${var.cluster-name}"
value = "owned"
propagate_at_launch = true
}
}
###########################
# Workstation External IP #
###########################
data "http" "workstation-external-ip" {
url = "http://icanhazip.com"
}
locals {
workstation-external-cidr = "${chomp(data.http.workstation-external-ip.body)}/32"
}