resource "aws_instance" "web" {
  instance_type = "t2.micro"
  ami = "${lookup(var.aws_amis, var.aws_region)}"

  key_name = "${var.key_name}" # this is my keypair
  connection {
    type = "ssh"
    user = "${var.ssh_user}"
  }
  vpc_security_group_ids = ["${aws_security_group.default.id}"]
  subnet_id = "${aws_subnet.default.id}"
  provisioner "remote-exec" {
    inline = [
      "sudo apt-get -y update"
    ]
  }
}

aws_instance.web: Still creating... (5m20s elapsed)
aws_instance.web (remote-exec): Connecting to remote host via SSH...
aws_instance.web (remote-exec):   Host: 34.250.66.198
aws_instance.web (remote-exec):   User: ubuntu
aws_instance.web (remote-exec):   Password: false
aws_instance.web (remote-exec):   Private key: false
aws_instance.web (remote-exec):   SSH Agent: true
Error applying plan:

1 error(s) occurred:

* aws_instance.web: 1 error(s) occurred:

* timeout

variable "aws_amis" {
  default = {
    eu-west-1 = "ami-674cbc1e"
    us-east-1 = "ami-1d4e7a66"
    us-west-1 = "ami-969ab1f6"
    us-west-2 = "ami-8803e0f0"
  }
}