1 files changed, 82 insertions, 0 deletions
diff --git a/Terraform/AWS/ha-instances-with-configs/transit_gateway.tf b/Terraform/AWS/ha-instances-with-configs/transit_gateway.tf
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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
+}