Application Load Balancer (path-based-route) to AWS Lambda

Create an Application Load Balancer with path-based routing using AWS Lambda as target

This pattern shows how to create an Application Load Balancer with path-based routing along with associated listener and target as AWS Lambda. Implemented in Terraform.


# Create AWS VPC 
resource "aws_vpc" "vpc" {
  cidr_block = var.vpc_cidr

}

# Create public subnet 1
resource "aws_subnet" "public_subnet1" {
  cidr_block = "10.0.1.0/24"
  vpc_id = aws_vpc.vpc.id
  availability_zone = "${var.region}a"
  tags = {
    Name = "Subnet for ${var.region}a"
  }
}

# Create public subnet 2
resource "aws_subnet" "public_subnet2" {
  cidr_block = "10.0.2.0/24"
  vpc_id = aws_vpc.vpc.id
  availability_zone = "${var.region}b"
  tags = {
    Name = "Subnet for ${var.region}b"
  }
}

# Create a route table 
resource "aws_route_table" "public_rt" {
  vpc_id = aws_vpc.vpc.id

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

  tags = {
    Name = "public_rt"
  }
}

# Associate the route table with public subnet 1
resource "aws_route_table_association" "public_rt_table_a" {
  subnet_id      = aws_subnet.public_subnet1.id
  route_table_id = aws_route_table.public_rt.id
}

# Associate the route table with public subnet 2
resource "aws_route_table_association" "public_rt_table_b" {
  subnet_id      = aws_subnet.public_subnet2.id
  route_table_id = aws_route_table.public_rt.id
}

# Create an Internet Gateway
resource "aws_internet_gateway" "gw" {
  vpc_id = aws_vpc.vpc.id
  tags = {
    "Name" = "example-igw"
  }
}

# Create IAM Role for Lambda Function
resource "aws_iam_role" "lambda_role" {
name   = "Lambda_Function_Role"
assume_role_policy = <