securitygroup.tf

#https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group
resource "aws_security_group" "ec2_instance" {
  name        = "IN-SG"
  description = "Allow inbound and outbound traffic to EC2 instances from load balancer security group"
  ingress {
    from_port       = 80
    to_port         = 80
    protocol        = "tcp"
    security_groups = [aws_security_group.lb.id]
    description     = "Allow traffic from load balancer security group."
  }
  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
    description = "Allow all outbound traffic."
  }
  vpc_id = module.vpc.vpc.id
}

#https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group
resource "aws_security_group" "lb" {
  name        = "LB-SG"
  description = "Allow inbound and outbound traffic to load balancer from the internet."
  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
    description = "Allow traffic into the load balancer from the EC2 instance."
  }
  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
    description = "Allow traffic out of the load balancer to the Internet."
  }
  vpc_id = module.vpc.vpc.id
}