Add EVS module (#89)

Co-authored-by: Victor Getz <sd>

README.md

@@ -42,6 +42,7 @@ module "vpc" {
 - [snat:](https://github.com/iits-consulting/terraform-opentelekomcloud-project-factory/tree/master/modules/snat) Public SNAT gateway to grant internet access from a VPC without shared SNAT.
 - [vpn:](https://github.com/iits-consulting/terraform-opentelekomcloud-project-factory/tree/master/modules/vpn) Creates a VPN tunnel.
 - [waf:](https://github.com/iits-consulting/terraform-opentelekomcloud-project-factory/tree/master/modules/waf) Create Web Application Firewall for a Domain
+- [evs:](https://github.com/iits-consulting/terraform-opentelekomcloud-project-factory/tree/master/modules/evs) Create an encrypted Elastic Volume Service (EVS)
 
 ## Quickstart
 

modules/evs/README.MD

@@ -0,0 +1,55 @@
+# Terraform OpenTelekomCloud Module
+
+This is a Terraform module that provisions encrypted Elastic Volume Service (EVS) on OpenTelekomCloud. 
+This module is capable of creating multiple EVS volumes using parameters for their names, specifications, and availability zones.
+
+
+### Usage example
+
+```hcl
+
+module "elasticsearch_volumes" {
+  source      = "registry.terraform.io/iits-consulting/project-factory/opentelekomcloud//modules/evs"
+  volume_names       = ["elasticsearch-${var.stage}-0","elasticsearch-${var.stage}-1"]
+  availability_zones = [  "eu-de-02", "eu-de-03"]
+  kms_key_prefix     = "elasticsearch-${var.stage}"
+  spec = {
+    size        = 200
+    volume_type = "SSD"
+    device_type = "SCSI"
+  }
+  tags = local.tags
+}
+
+
+```
+
+
+## Requirements
+
+| Name | Version |
+|------|---------|
+| terraform | >= 0.13 |
+| opentelekomcloud | * |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| opentelekomcloud | * |
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|:----:|:-----:|:-----:|
+| volume_names | List of names for the volumes to be created | list(string) | n/a | yes |
+| tags | Common tag set for project resources | map(string) | {} | no |
+| spec | Volume specifications like size, volume type and device type | object | { size=20, volume_type="SSD", device_type="SCSI" } | no |
+| availability_zones | List of availability zones for the volumes | list(string) | ["eu-de-01"] | no |
+| kms_key_prefix | Prefix to be used for creating the kms key | string | n/a | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| volumes | A map of created volumes where keys are volume names |

modules/evs/evs.tf

@@ -0,0 +1,26 @@
+resource "random_id" "volume_kms_id" {
+  byte_length = 4
+}
+
+resource "opentelekomcloud_kms_key_v1" "volume_kms_key" {
+  key_alias       = "${var.kms_key_prefix}-evs-key-${random_id.volume_kms_id.hex}"
+  key_description = "Persistent volume encryption key for ${var.kms_key_prefix}"
+  pending_days    = 7
+  is_enabled      = "true"
+}
+
+resource "opentelekomcloud_evs_volume_v3" "evs_volumes" {
+  count             = length(var.volume_names)
+  name              = var.volume_names[count.index]
+  description       = "${var.volume_names[count.index]} EVS volume"
+  availability_zone = var.availability_zones[count.index % length(var.availability_zones)]
+  size              = var.spec.size
+  volume_type       = var.spec.volume_type
+  device_type       = var.spec.device_type
+  tags              = var.tags
+  kms_id            = opentelekomcloud_kms_key_v1.volume_kms_key.id
+}
+
+output "volumes" {
+  value = { for volume in opentelekomcloud_evs_volume_v3.evs_volumes : volume.name => volume }
+}

modules/evs/variables.tf

@@ -0,0 +1,25 @@
+variable "volume_names" {
+  type = list(string)
+}
+
+variable "tags" {
+  type        = map(string)
+  description = "Common tag set for project resources"
+  default     = {}
+}
+
+variable "spec" {
+  default = {
+    size        = 20
+    volume_type = "SSD"
+    device_type = "SCSI"
+  }
+}
+
+variable "availability_zones" {
+  default = ["eu-de-01"]
+}
+
+variable "kms_key_prefix" {
+  type = string
+}

modules/evs/versions.tf

@@ -0,0 +1,7 @@
+terraform {
+  required_providers {
+    opentelekomcloud = {
+      source = "opentelekomcloud/opentelekomcloud"
+    }
+  }
+}