vpc_peering.tf

resource "aws_vpc_peering_connection" "test-vpc" {
  peer_vpc_id = "${var.secondary_vpc_id}"
  vpc_id      = "${var.primary_vpc_id}"
  auto_accept = true

  tags {
    Name = "my-vpc-peering"
  }
}

resource "aws_route" "vpc1-to-vpc2" {
  route_table_id            = "${var.vpc1_route_id}"
  destination_cidr_block    = "${var.vpc2_cidr_block}"
  vpc_peering_connection_id = "${aws_vpc_peering_connection.test-vpc.id}"
}

resource "aws_route" "vpc2-to-vpc1" {
  route_table_id            = "${var.vpc2_route_id}"
  destination_cidr_block    = "${var.vpc1_cidr_block}"
  vpc_peering_connection_id = "${aws_vpc_peering_connection.test-vpc.id}"
}