security_groups.tf

resource "aws_security_group" "apps" {
  name        = "Main SG for apps"
  description = "Allow SSH and traffic on port 3000 from anywhere"
  vpc_id      = "${var.vpc_id}"

  ingress {
    description = "SSH"
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    description = "Traffic"
    from_port   = 3000
    to_port     = 3000
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  egress {
    description = "Allow all outgoing traffic"
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

resource "aws_security_group" "elb" {
  name        = "Main SG for ELBs"
  description = "Allow incoming traffic on listening port"
  vpc_id      = "${var.vpc_id}"

  ingress {
    description = "Traffic"
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  egress {
    description     = "Traffic"
    from_port       = 3000
    to_port         = 3000
    protocol        = "tcp"
    security_groups = ["${aws_security_group.apps.id}"]
  }
}