kubespray/contrib/terraform/aws/modules/vpc/main.tf

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resource "aws_vpc" "cluster-vpc" {
cidr_block = var.aws_vpc_cidr_block
#DNS Related Entries
enable_dns_support = true
enable_dns_hostnames = true
tags = merge(var.default_tags, tomap({
Name = "kubernetes-${var.aws_cluster_name}-vpc"
}))
}
resource "aws_eip" "cluster-nat-eip" {
count = length(var.aws_cidr_subnets_public)
vpc = true
}
resource "aws_internet_gateway" "cluster-vpc-internetgw" {
vpc_id = aws_vpc.cluster-vpc.id
tags = merge(var.default_tags, tomap({
Name = "kubernetes-${var.aws_cluster_name}-internetgw"
}))
}
resource "aws_subnet" "cluster-vpc-subnets-public" {
vpc_id = aws_vpc.cluster-vpc.id
count = length(var.aws_avail_zones)
availability_zone = element(var.aws_avail_zones, count.index)
cidr_block = element(var.aws_cidr_subnets_public, count.index)
tags = merge(var.default_tags, tomap({
Name = "kubernetes-${var.aws_cluster_name}-${element(var.aws_avail_zones, count.index)}-public"
"kubernetes.io/cluster/${var.aws_cluster_name}" = "member"
}))
}
resource "aws_nat_gateway" "cluster-nat-gateway" {
count = length(var.aws_cidr_subnets_public)
allocation_id = element(aws_eip.cluster-nat-eip.*.id, count.index)
subnet_id = element(aws_subnet.cluster-vpc-subnets-public.*.id, count.index)
}
resource "aws_subnet" "cluster-vpc-subnets-private" {
vpc_id = aws_vpc.cluster-vpc.id
count = length(var.aws_avail_zones)
availability_zone = element(var.aws_avail_zones, count.index)
cidr_block = element(var.aws_cidr_subnets_private, count.index)
tags = merge(var.default_tags, tomap({
Name = "kubernetes-${var.aws_cluster_name}-${element(var.aws_avail_zones, count.index)}-private"
}))
}
#Routing in VPC
#TODO: Do we need two routing tables for each subnet for redundancy or is one enough?
resource "aws_route_table" "kubernetes-public" {
vpc_id = aws_vpc.cluster-vpc.id
route {
cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.cluster-vpc-internetgw.id
}
tags = merge(var.default_tags, tomap({
Name = "kubernetes-${var.aws_cluster_name}-routetable-public"
}))
}
resource "aws_route_table" "kubernetes-private" {
count = length(var.aws_cidr_subnets_private)
vpc_id = aws_vpc.cluster-vpc.id
route {
cidr_block = "0.0.0.0/0"
nat_gateway_id = element(aws_nat_gateway.cluster-nat-gateway.*.id, count.index)
}
tags = merge(var.default_tags, tomap({
Name = "kubernetes-${var.aws_cluster_name}-routetable-private-${count.index}"
}))
}
resource "aws_route_table_association" "kubernetes-public" {
count = length(var.aws_cidr_subnets_public)
subnet_id = element(aws_subnet.cluster-vpc-subnets-public.*.id, count.index)
route_table_id = aws_route_table.kubernetes-public.id
}
resource "aws_route_table_association" "kubernetes-private" {
count = length(var.aws_cidr_subnets_private)
subnet_id = element(aws_subnet.cluster-vpc-subnets-private.*.id, count.index)
route_table_id = element(aws_route_table.kubernetes-private.*.id, count.index)
}
#Kubernetes Security Groups
resource "aws_security_group" "kubernetes" {
name = "kubernetes-${var.aws_cluster_name}-securitygroup"
vpc_id = aws_vpc.cluster-vpc.id
tags = merge(var.default_tags, tomap({
Name = "kubernetes-${var.aws_cluster_name}-securitygroup"
}))
}
resource "aws_security_group_rule" "allow-all-ingress" {
type = "ingress"
from_port = 0
to_port = 65535
protocol = "-1"
cidr_blocks = [var.aws_vpc_cidr_block]
security_group_id = aws_security_group.kubernetes.id
}
resource "aws_security_group_rule" "allow-all-egress" {
type = "egress"
from_port = 0
to_port = 65535
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
security_group_id = aws_security_group.kubernetes.id
}
resource "aws_security_group_rule" "allow-ssh-connections" {
type = "ingress"
from_port = 22
to_port = 22
protocol = "TCP"
cidr_blocks = ["0.0.0.0/0"]
security_group_id = aws_security_group.kubernetes.id
}