thyme/infrastructure/aws/vpc.tf at main · ollygarden/thyme · GitHub

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# VPC
resource "aws_vpc" "main" {
  cidr_block           = var.vpc_cidr
  enable_dns_hostnames = true
  enable_dns_support   = true

  tags = merge(
    var.common_tags,
    {
      Name                                        = "${local.cluster_name}-vpc"
      "kubernetes.io/cluster/${local.cluster_name}" = "shared"
    }
  )
}

# Internet Gateway
resource "aws_internet_gateway" "main" {
  vpc_id = aws_vpc.main.id

  tags = merge(
    var.common_tags,
    {
      Name = "${local.cluster_name}-igw"
    }
  )
}

# Public Subnets
resource "aws_subnet" "public" {
  count                   = length(local.azs)
  vpc_id                  = aws_vpc.main.id
  cidr_block              = local.public_subnet_cidrs[count.index]
  availability_zone       = local.azs[count.index]
  map_public_ip_on_launch = true

  tags = merge(
    var.common_tags,
    {
      Name                                        = "${local.cluster_name}-public-${local.azs[count.index]}"
      "kubernetes.io/cluster/${local.cluster_name}" = "shared"
      "kubernetes.io/role/elb"                      = "1"
    }
  )
}

# Private Subnets
resource "aws_subnet" "private" {
  count             = length(local.azs)
  vpc_id            = aws_vpc.main.id
  cidr_block        = local.private_subnet_cidrs[count.index]
  availability_zone = local.azs[count.index]

  tags = merge(
    var.common_tags,
    {
      Name                                        = "${local.cluster_name}-private-${local.azs[count.index]}"
      "kubernetes.io/cluster/${local.cluster_name}" = "shared"
      "kubernetes.io/role/internal-elb"             = "1"
    }
  )
}

# Elastic IPs for NAT Gateways
resource "aws_eip" "nat" {
  count  = var.enable_nat_gateway_ha ? length(local.azs) : 1
  domain = "vpc"

  tags = merge(
    var.common_tags,
    {
      Name = "${local.cluster_name}-nat-eip-${count.index + 1}"
    }
  )

  depends_on = [aws_internet_gateway.main]
}

# NAT Gateways
resource "aws_nat_gateway" "main" {
  count         = var.enable_nat_gateway_ha ? length(local.azs) : 1
  allocation_id = aws_eip.nat[count.index].id
  subnet_id     = aws_subnet.public[count.index].id

  tags = merge(
    var.common_tags,
    {
      Name = "${local.cluster_name}-nat-${count.index + 1}"
    }
  )

  depends_on = [aws_internet_gateway.main]
}

# Public Route Table
resource "aws_route_table" "public" {
  vpc_id = aws_vpc.main.id

  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = aws_internet_gateway.main.id
  }

  tags = merge(
    var.common_tags,
    {
      Name = "${local.cluster_name}-public-rt"
    }
  )
}

# Public Route Table Associations
resource "aws_route_table_association" "public" {
  count          = length(local.azs)
  subnet_id      = aws_subnet.public[count.index].id
  route_table_id = aws_route_table.public.id
}

# Private Route Tables
resource "aws_route_table" "private" {
  count  = var.enable_nat_gateway_ha ? length(local.azs) : 1
  vpc_id = aws_vpc.main.id

  route {
    cidr_block     = "0.0.0.0/0"
    nat_gateway_id = aws_nat_gateway.main[count.index].id
  }

  tags = merge(
    var.common_tags,
    {
      Name = "${local.cluster_name}-private-rt-${count.index + 1}"
    }
  )
}

# Private Route Table Associations
resource "aws_route_table_association" "private" {
  count          = length(local.azs)
  subnet_id      = aws_subnet.private[count.index].id
  route_table_id = var.enable_nat_gateway_ha ? aws_route_table.private[count.index].id : aws_route_table.private[0].id
}