Terraform Demo Snippet

sg_rules.tf

# LB -> Clients
resource "aws_security_group_rule" "lb_client_egress" {
  type                     = "egress"
  from_port                = "${local.client_port}"
  to_port                  = "${local.client_port}"
  protocol                 = "tcp"
  source_security_group_id = "${aws_security_group.client.id}"
  security_group_id        = "${aws_security_group.lb.id}"
}

resource "aws_security_group_rule" "client_lb_inbound" {
  type                     = "ingress"
  from_port                = "${local.client_port}"
  to_port                  = "${local.client_port}"
  protocol                 = "tcp"
  source_security_group_id = "${aws_security_group.lb.id}"
  security_group_id        = "${aws_security_group.client.id}"
}