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subnet_nat.tf
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subnet_nat.tf
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resource "aws_subnet" "nat" {
count = length(data.aws_availability_zones.this.names)
vpc_id = aws_vpc.this.id
availability_zone = data.aws_availability_zones.this.names[count.index]
map_public_ip_on_launch = true
cidr_block = cidrsubnet(
aws_vpc.this.cidr_block,
ceil(log(length(var.subnets), 2)) + ceil(log(length(data.aws_availability_zones.this.names), 2)),
index(var.subnets, "nat") * length(data.aws_availability_zones.this.names) + count.index
)
tags = merge(var.tags,
{
Name = "${var.name}-nat-${data.aws_availability_zones.this.names[count.index]}"
SubnetType = "nat"
},
{
"kubernetes.io/cluster/${var.name}" = "owned"
}
)
}
resource "aws_route_table" "nat" {
vpc_id = aws_vpc.this.id
route {
cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.this.id
}
tags = merge(var.tags,
{
Name = "${var.name}-nat"
}
)
}
resource "aws_route_table_association" "nat" {
count = length(aws_subnet.nat)
subnet_id = "${aws_subnet.nat.*.id[count.index]}"
route_table_id = aws_route_table.nat.id
}
resource "aws_eip" "nat" {
count = length(aws_subnet.private)
vpc = true
tags = merge(var.tags,
{
Name = "${var.name}-nat-${data.aws_availability_zones.this.names[count.index]}"
}
)
}
# https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html
resource "aws_nat_gateway" "this" {
count = length(aws_subnet.private)
allocation_id = aws_eip.nat[count.index].id
subnet_id = aws_subnet.nat[count.index].id
depends_on = [aws_internet_gateway.this]
tags = merge(var.tags,
{
Name = "${var.name}-${data.aws_availability_zones.this.names[count.index]}"
}
)
}
resource "aws_flow_log" "nat" {
count = var.enable_flow_logs ? length(data.aws_availability_zones.this.names) : 0
iam_role_arn = aws_iam_role.vpc_flow_logs[0].arn
log_destination = aws_cloudwatch_log_group.vpc_flow_logs[0].arn
traffic_type = var.flow_log_traffic_type
subnet_id = aws_subnet.nat[count.index].id
}
resource "aws_network_acl" "nat" {
count = var.enable_network_acls ? length(data.aws_availability_zones.this.names) : 0
vpc_id = aws_vpc.this.id
subnet_ids = [aws_subnet.nat[count.index].id]
tags = merge(var.tags,
{
Name = "${var.name}-nat-${data.aws_availability_zones.this.names[count.index]}"
}
)
}
# Allow all egress traffic for NAT
resource "aws_network_acl_rule" "nat_egress_all" {
count = var.enable_network_acls ? length(data.aws_availability_zones.this.names) : 0
network_acl_id = aws_network_acl.nat[count.index].id
rule_number = 1
egress = true
protocol = "all"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
}
resource "aws_network_acl_rule" "nat_ingress_all" {
count = var.enable_network_acls ? length(data.aws_availability_zones.this.names) : 0
network_acl_id = aws_network_acl.nat[count.index].id
rule_number = 1
egress = false
protocol = "all"
rule_action = "allow"
cidr_block = "0.0.0.0/0"
}
# resource "aws_network_acl_rule" "nat_ingress_tcp" {
# count = length(data.aws_availability_zones.this.names)
# network_acl_id = aws_network_acl.nat[count.index].id
# rule_number = 1
# egress = false
# protocol = "tcp"
# rule_action = "allow"
# cidr_block = aws_subnet.private[count.index].cidr_block
# from_port = 0
# to_port = 65535
# }
# resource "aws_network_acl_rule" "nat_ingress_tcp_return" {
# count = length(data.aws_availability_zones.this.names)
# network_acl_id = aws_network_acl.nat[count.index].id
# rule_number = 2
# egress = false
# protocol = "tcp"
# rule_action = "allow"
# cidr_block = "0.0.0.0/0"
# from_port = 1024
# to_port = 65535
# }
# resource "aws_network_acl_rule" "nat_ingress_ntp" {
# count = length(data.aws_availability_zones.this.names)
# network_acl_id = aws_network_acl.nat[count.index].id
# rule_number = 3
# egress = false
# protocol = "udp"
# rule_action = "allow"
# cidr_block = aws_subnet.private[count.index].cidr_block
# from_port = 123
# to_port = 123
# }