main.tf

...

resource "aws_instance" "jenkins" {
  ami             = data.aws_ami.ubuntu.id
  instance_type   = "t2.micro"
  security_groups = [aws_security_group.web_traffic.name]
  key_name        = "kluu"

  provisioner "remote-exec" {
    inline = [
      "wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -",
      "sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'",
      "sudo apt update -qq",
      "sudo apt install -y default-jre",
      "sudo apt install -y jenkins",
      "sudo systemctl start jenkins",
      "sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080",
      "sudo sh -c \"iptables-save > /etc/iptables.rules\"",
      "echo iptables-persistent iptables-persistent/autosave_v4 boolean true | sudo debconf-set-selections",
      "echo iptables-persistent iptables-persistent/autosave_v6 boolean true | sudo debconf-set-selections",
      "sudo apt-get -y install iptables-persistent",
      "sudo ufw allow 8080",
    ]
  }

  connection {
    type        = "ssh"
    host        = self.public_ip
    user        = "ubuntu"
    private_key = file("~/kluu.pem")
  }

  tags = {
    "Name"      = "Jenkins_Server"
    "Terraform" = "true"
  }
}