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eks-worker-nodes.tf
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eks-worker-nodes.tf
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#
# EKS Worker Nodes Resources
# * IAM role allowing Kubernetes actions to access other AWS services
# * EC2 Security Group to allow networking traffic
# * Data source to fetch latest EKS worker AMI
# * AutoScaling Launch Configuration to configure worker instances
# * AutoScaling Group to launch worker instances
#
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 = "${aws_security_group.demo-cluster.id}"
to_port = 65535
type = "ingress"
}
data "aws_ami" "eks-worker" {
filter {
name = "name"
values = ["eks-worker-*"]
}
most_recent = true
owners = ["602401143452"] # Amazon
}
# EKS currently documents this required userdata for EKS worker nodes to
# properly configure Kubernetes applications on the EC2 instance.
# We utilize a Terraform local here to simplify Base64 encoding this
# information into the AutoScaling Launch Configuration.
# More information: https://amazon-eks.s3-us-west-2.amazonaws.com/1.10.3/2018-06-05/amazon-eks-nodegroup.yaml
locals {
demo-node-userdata = <<USERDATA
#!/bin/bash -xe
CA_CERTIFICATE_DIRECTORY=/etc/kubernetes/pki
CA_CERTIFICATE_FILE_PATH=$CA_CERTIFICATE_DIRECTORY/ca.crt
mkdir -p $CA_CERTIFICATE_DIRECTORY
echo "${aws_eks_cluster.demo.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,${aws_eks_cluster.demo.endpoint},g /var/lib/kubelet/kubeconfig
sed -i s,CLUSTER_NAME,${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.demo.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 kube-proxy
USERDATA
}
resource "aws_launch_configuration" "demo" {
associate_public_ip_address = false
iam_instance_profile = "${aws_iam_instance_profile.demo-node.name}"
image_id = "${data.aws_ami.eks-worker.id}"
instance_type = "m4.xlarge"
name_prefix = "terraform-eks-demo"
security_groups = ["${aws_security_group.demo-node.id}"]
user_data_base64 = "${base64encode(local.demo-node-userdata)}"
key_name = "jim_aws"
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-private.*.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
}
}