Terraform 0.12 (#20)

* Terraform 0.12

docker-demo-3/jenkins.tf

@@ -1,33 +1,32 @@
 resource "aws_instance" "jenkins-instance" {
-  ami           = "${lookup(var.AMIS, var.AWS_REGION)}"
+  ami           = var.AMIS[var.AWS_REGION]
   instance_type = "t2.small"
 
   # the VPC subnet
-  subnet_id = "${aws_subnet.main-public-1.id}"
+  subnet_id = aws_subnet.main-public-1.id
 
   # the security group
-  vpc_security_group_ids = ["${aws_security_group.jenkins-securitygroup.id}"]
+  vpc_security_group_ids = [aws_security_group.jenkins-securitygroup.id]
 
   # the public SSH key
-  key_name = "${aws_key_pair.mykeypair.key_name}"
+  key_name = aws_key_pair.mykeypair.key_name
 
   # user data
-  user_data = "${data.template_cloudinit_config.cloudinit-jenkins.rendered}"
-
+  user_data = data.template_cloudinit_config.cloudinit-jenkins.rendered
 }
 
 resource "aws_ebs_volume" "jenkins-data" {
-    availability_zone = "eu-west-1a"
-    size = 20
-    type = "gp2" 
-    tags {
-        Name = "jenkins-data"
-    }
+  availability_zone = "eu-west-1a"
+  size              = 20
+  type              = "gp2"
+  tags = {
+    Name = "jenkins-data"
+  }
 }
 
 resource "aws_volume_attachment" "jenkins-data-attachment" {
-  device_name = "${var.INSTANCE_DEVICE_NAME}"
-  volume_id = "${aws_ebs_volume.jenkins-data.id}"
-  instance_id = "${aws_instance.jenkins-instance.id}"
+  device_name = var.INSTANCE_DEVICE_NAME
+  volume_id   = aws_ebs_volume.jenkins-data.id
+  instance_id = aws_instance.jenkins-instance.id
 }