security_group.tf

#https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/default_security_group
resource "aws_default_security_group" "default" {
  vpc_id = aws_vpc.this.id
}
#https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group
resource "aws_security_group" "instance-sg" {
  name        = "${var.name}-ec2-access"
  description = "allow traffic to the ec2 instance"
  vpc_id      = aws_vpc.this.id
  tags = {
    "Name" = "${var.name}-ec2-sg"
  }
}
#https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group_rule
resource "aws_security_group_rule" "egress_instance_sg" {
  description       = "allow traffic from the vpc to reach outside the vpc"
  type              = "egress"
  from_port         = 0
  to_port           = 0
  protocol          = "-1"
  cidr_blocks       = ["0.0.0.0/0"]
  security_group_id = aws_security_group.instance-sg.id
}