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# TRANSIT GATEWAY
resource "aws_ec2_transit_gateway" "tgw" {
description = "Main Transit Gateway"
amazon_side_asn = 64512
auto_accept_shared_attachments = "enable"
default_route_table_association = "disable"
default_route_table_propagation = "disable"
tags = {
Name = "${var.prefix}-tgw"
}
}
# TRANSIT GATEWAY ATTACHMENT
resource "aws_ec2_transit_gateway_vpc_attachment" "transit_vpc_attachment" {
subnet_ids = [aws_subnet.transit_vpc_private_subnet_01.id, aws_subnet.transit_vpc_private_subnet_02.id]
transit_gateway_id = aws_ec2_transit_gateway.tgw.id
vpc_id = aws_vpc.transit_vpc.id
tags = {
Name = "${var.prefix}-${var.transit_vpc_name}-attachment"
}
}
resource "aws_ec2_transit_gateway_vpc_attachment" "data_vpc_attachment" {
subnet_ids = [aws_subnet.data_vpc_private_subnet.id]
transit_gateway_id = aws_ec2_transit_gateway.tgw.id
vpc_id = aws_vpc.data_vpc.id
tags = {
Name = "${var.prefix}-${var.data_vpc_name}-attachment"
}
}
resource "aws_ec2_transit_gateway_connect" "tgw_connect" {
transport_attachment_id = aws_ec2_transit_gateway_vpc_attachment.transit_vpc_attachment.id
transit_gateway_id = aws_ec2_transit_gateway.tgw.id
tags = {
Name = "${var.prefix}-${var.transit_vpc_name}-connect"
}
}
# TRANSIT GATEWAY ROUTE
resource "aws_ec2_transit_gateway_route_table" "tgw_rt" {
transit_gateway_id = aws_ec2_transit_gateway.tgw.id
tags = {
Name = "${var.prefix}-tgw-rtb"
}
}
resource "aws_ec2_transit_gateway_route" "azure" {
transit_gateway_route_table_id = aws_ec2_transit_gateway_route_table.tgw_rt.id
destination_cidr_block = var.on_prem_subnet_cidr
transit_gateway_attachment_id = aws_ec2_transit_gateway_vpc_attachment.transit_vpc_attachment.id
}
# TRANSIT GATEWAY ASSOSIATION and PROPAGATION
resource "aws_ec2_transit_gateway_route_table_association" "transit_vpc_rt_assoc" {
transit_gateway_attachment_id = aws_ec2_transit_gateway_vpc_attachment.transit_vpc_attachment.id
transit_gateway_route_table_id = aws_ec2_transit_gateway_route_table.tgw_rt.id
}
resource "aws_ec2_transit_gateway_route_table_association" "data_vpc_rt_assoc" {
transit_gateway_attachment_id = aws_ec2_transit_gateway_vpc_attachment.data_vpc_attachment.id
transit_gateway_route_table_id = aws_ec2_transit_gateway_route_table.tgw_rt.id
}
resource "aws_ec2_transit_gateway_route_table_propagation" "transit_vpc_rt_prop" {
transit_gateway_attachment_id = aws_ec2_transit_gateway_vpc_attachment.transit_vpc_attachment.id
transit_gateway_route_table_id = aws_ec2_transit_gateway_route_table.tgw_rt.id
}
resource "aws_ec2_transit_gateway_route_table_propagation" "data_vpc_rt_prop" {
transit_gateway_attachment_id = aws_ec2_transit_gateway_vpc_attachment.data_vpc_attachment.id
transit_gateway_route_table_id = aws_ec2_transit_gateway_route_table.tgw_rt.id
}
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