############################################################
# AWS # Setup the cloud provider "Amazon Web Services" (AWS)
############################################################

provider "aws" {

	access_key = "${var.access_key}"
	secret_key = "${var.secret_key}"
	region = "${var.region}"

}

############################################################
# Instances # Defining resources to create by terraform
############################################################

resource "aws_instance"  "docker_swarm_manager" {

	ami = "ami-f90a4880"
	instance_type= "t2.large"


	#Define securit_group to allow incoming or outcoming traffic from an EC2 instance
	security_groups = ["${aws_security_group.swarm_security_group.name}"]

	#key name is necessary to establish ssh connection to the EC2 instance
	key_name = "${aws_key_pair.keyPair.key_name}"

	
	#Define how to connect to instances EC2 (resources just created by terraform in AWS) via ssh protocol
	connection {
	    
	    # Connection type
	    type = "ssh"
	    
	    # The default username for our AMI
	    user = "ec2-user"
	    
	    # The path to our keyfile
	    private_key = "${file("AccessKeys/EC2Access/privateKey.pem")}" 
	    
	    password = "${var.password}"
	  }
	
	#Provisioner block is used to execute scripts on a local or remote machine 
	provisioner "remote-exec" {
		    inline = [
			"sudo apt-get update",
			"sudo apt-get install -y docker",
			"sudo service docker start",
			"sudo usermod -aG docker ec2-user",      
			"docker swarm init",
	     	        "sudo docker swarm join-token --q worker > /home/ec2-user/token",
			
	   ] 
	  }
	tags {
		#Instance name
		Name = "swarm-master"
	}

}

resource "aws_instance" "docker_swarm_worker" {
	
	count = 4
	ami = "ami-f90a4880"
	instance_type = "t2.large"
	user_data = "${file("${var.docker_install}")}"
	
	#Define securit_group to allow incoming or outcoming traffic from an EC2 instance
	security_groups = ["${aws_security_group.swarm_security_group.name}"]


	#key name is necessary to establish ssh connection to the EC2 instance
	key_name = "${aws_key_pair.keyPair.key_name}"


	connection {
	    
	    # Connection type
	    type = "ssh"
	    
	    # The default username for our AMI
	    user = "ec2-user"

	    # The path to our keyfile
	    private_key = "${file("AccessKeys/EC2Access/privateKey.pem")}" 

	    password = "${var.password}"
	  }
	
	#Provisioner block is used to execute scripts on a local or remote machine 
	provisioner "remote-exec" {
		    inline = [
			"sudo apt-get update",
			"sudo apt-get install -y docker",
			"sudo service docker start",
			"sudo usermod -aG docker ec2-user",
		        "sudo docker swarm join --token $(cat /home/ec2-user/token) ${aws_instance.docker_swarm_manager.private_ip}:2377",
		    ]
		  }
	
	
	tags {
		#Instance name
		Name = "swarm-worker-${count.index}"
	}
}