ksynth on ec2 instance (#61)

* ksynth on ec2 instance

* Implemented suggestions from review

synthetics_AWS/terraform/README.md

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+# Synthetics agent deployment on AWS ec2 instance
+
+The module creates ec2 instance with provided configuration and deploys `ksynth` agent.
+
+## Requirements
+
+| Name         | Version |
+|--------------|---------|
+| terraform    | ~> 1.0  |
+| aws provider | ~> 4.0  |
+| AWS CLI      | ~> 4.0  |
+
+
+## Inputs
+
+| Name                   | Description                                      | Type         | Default | Required |
+|------------------------|--------------------------------------------------|--------------|---------|----------|
+| vpc_security_group_ids | List of security groups IDs                      | list(string) |         | true     |
+| plan_id                | Kentik plan ID                                   | string       |         | true     |
+| region                 | Specifies AWS provider region                    | string       |         | false    |
+| key_name               | Key name of the Key Pair to use for the instance | string       |         | false    |
+| iam_instance_profile   | IAM role ID                                      | string       |         | false    |
+| subnet_id              | Subnet ID                                        | string       |         | false    |
+
+
+## Usage
+
+  ```bash
+  terraform init
+  terraform apply \
+  -var='vpc_security_group_ids=["<vpc-security-group-id>"]' \
+  -var='plan_id=<plan-id>' \
+  -var='region=<region-name>' \
+  -var='key_name=<key-name>' \
+  -var='iam_instance_profile=<iam-instance-profile>' \
+  -var='subnet_id=<subnet-id>'
+  ```

synthetics_AWS/terraform/ec2.tf

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+data "aws_ami" "ubuntu" {
+  most_recent = true
+
+  filter {
+    name   = "name"
+    # Make sure that given ami is not deprecated.
+    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
+  }
+
+  filter {
+    name   = "virtualization-type"
+    values = ["hvm"]
+  }
+
+  owners = ["099720109477"]
+}
+
+resource "aws_instance" "instance" {
+  ami           = data.aws_ami.ubuntu.id
+  instance_type = "t2.micro"
+
+  iam_instance_profile =  var.iam_instance_profile
+  key_name = var.key_name
+  vpc_security_group_ids = var.vpc_security_group_ids
+  subnet_id = var.subnet_id
+
+  user_data = <<EOF
+#!/bin/bash
+curl -s https://packagecloud.io/install/repositories/kentik/ksynth/script.deb.sh | sudo bash
+apt-get install ksynth
+echo "KENTIK_COMPANY=${var.plan_id}" >> /etc/default/ksynth
+systemctl start ksynth
+# Restart agent after setting variables
+systemctl stop ksynth && systemctl start ksynth
+EOF
+
+  tags = {
+    Name = "ksynth_agent"
+  }
+}

synthetics_AWS/terraform/main.tf

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+terraform {
+  required_version = "~> 1.0"
+  required_providers {
+    aws = {
+      version = "~> 4.0"
+    }
+  }
+}
+
+provider "aws" {
+  region  = var.region
+}

synthetics_AWS/terraform/variables.tf

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+variable "key_name" {
+  description = "Key name of the Key Pair to use for the instance"
+  type        = string
+  default     = ""
+}
+
+variable "iam_instance_profile" {
+  description = "IAM role ID"
+  type        = string
+  default     = ""
+}
+
+variable "subnet_id" {
+  description = "Subnet ID"
+  type        = string
+  default     = ""
+}
+
+variable "vpc_security_group_ids" {
+  description = "List of security groups IDs"
+  type        = list(string)
+  default     = [""]
+}
+
+variable "plan_id" {
+  description = "Kentik plan ID"
+  type        = string
+  default     = ""
+}
+
+variable "region" {
+  description = "Specifies AWS provider region"
+  type        = string
+  default = ""
+}