Added terraform for Vultr (#458)

* Added terraform for Vultr

* Fixed terraform format
Fixed typo for container name

* Minor changes

Added ENABLE_PRIMITIVE option
Fixed md linter errors

* Fixed another md linter errors

Co-authored-by: Oleksii Titov <[email protected]>

terraform/vultr/README.md

@@ -0,0 +1,33 @@
+# Vultr deployment
+
+## Requirements
+
+* Vultr account
+* API token
+* `terraform`
+
+## Deploy
+
+```bash
+export VULTR_API_KEY="Your Vultr API Key"
+terraform init
+terraform plan -var "key=<path_to_ssh_key>" -var "num_inst=<number of instances to create>"
+terraform apply -var "key=<path_to_ssh_key>" -var "num_inst=<number of instances to create>"
+```
+
+## Destroy
+
+To delete all the resources that were created run
+
+```bash
+terraform destroy
+```
+
+## Tips
+
+Deploy script installs vnstat util that is useful for monitoring server network performance.
+Example, get network statistics for the last 5 hours:
+
+```bash
+ssh root@ip vnstat -h 5
+```

terraform/vultr/main.tf

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+terraform {
+  required_providers {
+    vultr = {
+      source  = "vultr/vultr"
+      version = "2.10.0"
+    }
+  }
+}
+
+resource "vultr_ssh_key" "ssh_key" {
+  name    = "my-ssh-key"
+  ssh_key = file("${var.key}.pub")
+}
+
+resource "vultr_instance" "my_instance" {
+  count       = var.num_inst
+  plan        = var.plan
+  region      = var.region
+  app_id      = var.app
+  ssh_key_ids = [vultr_ssh_key.ssh_key.id]
+
+  provisioner "remote-exec" {
+    script = "scripts/deploy.sh"
+
+    connection {
+      host        = self.main_ip
+      private_key = file("${var.key}")
+    }
+  }
+}
+
+

terraform/vultr/outputs.tf

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+output "ip" {
+  value = vultr_instance.my_instance[*].main_ip
+}

terraform/vultr/scripts/deploy.sh

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+#! /bin/bash
+
+apt install -y vnstat
+
+container_name="db1000n"
+docker_cmd="docker run -d -it --rm --name=${container_name} -e ENABLE_PRIMITIVE=false --pull always ghcr.io/arriven/db1000n"
+
+${docker_cmd}
+
+echo "0 */2 * * * docker kill ${container_name} || true && ${docker_cmd}" >> cronjob
+crontab cronjob

terraform/vultr/variable.tf

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+
+variable "region" {
+  default = "icn" # Seoul, South Korea
+}
+
+variable "plan" {
+  default = "vc2-1c-1gb"
+}
+
+variable "app" {
+  description = "Docker Ubuntu 20.04"
+  default     = "37"
+}
+
+variable "key" {
+  description = "Path to SSH key"
+  type        = string
+}
+
+variable "num_inst" {
+  type = number
+}