Working VKS with Terraform

What is Terraform?

Terraform is an open source infrastructure as code tool that allows users to manage their infrastructure easily and efficiently across different cloud platforms, such as VNG Cloud, AWS, Google Cloud and Azure. Terraform Server refers to the instance of the Terraform engine running on a specific server or machine. This is where infrastructure code is written and executed, allowing users to create, modify, and destroy resources on the cloud platform.

Terraform itself does not have a graphical user interface, instead users interact with it using a command line interface. Terraform requires a cloud provider account and key to be configured along with a Terraform configuration file to execute the infrastructure as code. Additionally, Terraform can operate in clustered environments where multiple users can collaborate on the same infrastructure codebase, making it a powerful and flexible tool for infrastructure management. cloud.

Implementation steps

To initialize a Kubernetes Cluster using Terraform, you need to perform the following steps:

Access the IAM Portal here , create a Service Account with VKS Full Access authority . Specifically, at the IAM site, you can:
- Select " Create a Service Account ", enter a name for the Service Account and click Next Step to assign permissions to the Service Account.
- Find and select Policy: VKSFullAccess then click " Create a Service Account " to create a Service Account, Policy: VKSFullAccess is created by VNG Cloud, you cannot delete these policies.
- After successful creation, you need to save the Client_ID and Secret_Key of the Service Account to perform the next step.
Access the VKS Portal here , Activate the VKS service on the Overview tab. Please wait until we successfully create your VKS account.
Install Terraform:
- Download and install Terraform for your operating system from https://developer.hashicorp.com/terraform/install .
Initialize Terraform configuration:
- Create a file variable.tfand declare Service Account information in this file.
- Create a file main.tfand define the Kubernetes Cluster resources you want to create.

For example:

The file variable.tf:you need to replace the Client ID and Client Secret created in step 1 in this file.

variable "client_id" {
  type = string
  default = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}
variable "client_secret" {
  type = string
  default = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

On the main.tf file , you need to be able to add resources to create a Cluster/ Node Group:
- Create independent Cluster my-vks-cluster and Node Group my-nodegroup:

resource "vngcloud_vks_cluster" "primary" {
  name      = "my-cluster"
  cidr      = "172.16.0.0/16"
  vpc_id    = "net-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  subnet_id = "sub-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
}

resource "vngcloud_vks_cluster_node_group" "primary" {
  name= "my-nodegroup"
  ssh_key_id= "ssh-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  cluster_id= vngcloud_vks_cluster.primary.id
}

Create Cluster with Default Node Group

resource "vngcloud_vks_cluster" "primary" {
  name      = "my-cluster"
  cidr      = "172.16.0.0/16"
  vpc_id    = "net-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  subnet_id = "sub-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  node_group {
    name= "my-nodegroup"
    ssh_key_id= "ssh-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  }
}

Attention:

We recommend that you create and manage Clusters and Node Groups as separate resources, as in the example below. This allows you to add or remove Node Groups without recreating the entire Cluster. If you declare Node Group Default directly in the vngcloud_vks_cluster resource, you cannot delete them without recreating the Cluster itself.

In the main.tf file, to successfully create a cluster with a node group, you must enter information in the following 4 fields:

  vpc_id    = "net-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  subnet_id = "sub-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  ssh_key_id= "ssh-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"

Example 1:

Below is the main.tf file I used to initialize the Cluster with the following parameters:

Cluster name: cluster-demo
K8S Version: v1.29.1
Mode: Public Cluster and Public Node Group
Node Group name: nodegroup1
Initial Node: 3
Turn on AutoScaling: scale from 0 to 5 nodes

terraform {
  required_providers {
    vngcloud = {
      source  = "vngcloud/vngcloud"
      version = "1.2.2"
    }
  }
}

provider "vngcloud" {
  token_url        = "https://iamapis.vngcloud.vn/accounts-api/v2/auth/token"
  client_id        = var.client_id
  client_secret    = var.client_secret
  vserver_base_url = "https://hcm-3.api.vngcloud.vn/vserver/vserver-gateway"
  vlb_base_url     = "https://hcm-3.api.vngcloud.vn/vserver/vlb-gateway"
}

resource "vngcloud_vks_cluster" "primary" {
  name      = "cluster-demo"
  description = "Cluster create via terraform"
  version = "v1.29.1"
  cidr      = "172.16.0.0/16"
  enable_private_cluster = false
  network_type = "CALICO"
  vpc_id    = "net-70ef12d4-d619-43fc-88f0-1c1511683123"
  subnet_id = "sub-0725ef54-a32e-404c-96f2-34745239c123"
  enabled_load_balancer_plugin = true
  enabled_block_store_csi_plugin = true
}

resource "vngcloud_vks_cluster_node_group" "primary" {
  cluster_id = vngcloud_vks_cluster.primary.id
  name = "nodegroup1"
  num_nodes = 3
  auto_scale_config {
    min_size = 0
    max_size = 5
  }
  upgrade_config {
    strategy = "SURGE"
    max_surge = 1
    max_unavailable = 0
  }
  image_id = "img-108b3a77-ab58-4000-9b3e-190d0b4b07fc"
  flavor_id = "flav-9e88cfb4-ec31-4ad4-8ba5-243459f6d123"
  disk_size = 50
  disk_type = "vtype-61c3fc5b-f4e9-45b4-8957-8aa7b6029018"
  enable_private_nodes = false
  ssh_key_id= "ssh-f923c53c-cba7-4131-9f86-175d04ae2123"
  security_groups = ["secg-faf05344-fbd6-4f10-80a2-cda08d15ba5e"]
  labels = {
    "test" = "terraform"
  }
  taint {
    key    = "key1"
    value  = "value1"
    effect = "PreferNoSchedule"
  }
}

Example 2

Below is the main.tf file I used to initialize the Cluster with the following parameters:

Cluster name: my-cluster
K8S Version: v1.29.1
Mode: Public Cluster and Private Node Group
Node Group name: my-nodegroup
Initial Node: 3 nodes
Turn on AutoScaling: scale from 0 to 5 nodes

First, apply the main file according to the following structure:

terraform {
  required_providers {
    vngcloud = {
      source  = "vngcloud/vngcloud"
      version = "1.2.2"
    }
  }
}

provider "vngcloud" {
  token_url        = "https://iamapis.vngcloud.vn/accounts-api/v2/auth/token"
  client_id        = var.client_id
  client_secret    = var.client_secret
  vserver_base_url = "https://hcm-3.api.vngcloud.vn/vserver/vserver-gateway"
  vlb_base_url     = "https://hcm-3.api.vngcloud.vn/vserver/vlb-gateway"
}

resource "vngcloud_vks_cluster" "primary" {
  name      = "my-cluster"
  description = "VNGCLOUD uses terraform"
  version = "v1.29.1"
  cidr      = "172.16.0.0/16"
  enable_private_cluster = false
  network_type = "CALICO"
  vpc_id    = "net-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  subnet_id = "sub-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  enabled_load_balancer_plugin = true
  enabled_block_store_csi_plugin = true
}

resource "vngcloud_vks_cluster_node_group" "primary" {
  cluster_id= vngcloud_vks_cluster.primary.id
  name= "my-nodegroup"
  num_nodes = 3
  auto_scale_config {
    min_size = 0
    max_size = 5
  }
  upgrade_config {
    strategy = "SURGE"
    max_surge = 1
	max_unavailable = 0
  }
  image_id = "img-108b3a77-ab58-4000-9b3e-190d0b4b07fc"
  flavor_id = "flav-9e88cfb4-ec31-4ad4-8ba5-243459f6dc4b"
  disk_size = 20
  disk_type = "vtype-61c3fc5b-f4e9-45b4-8957-8aa7b6029018"
  enable_private_nodes = true
  ssh_key_id= "ssh-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  labels = {
    "mylabel" = "vngcloud"
  }
  taint {
    key    = "mykey"
    value  = "myvalue"
    effect = "PreferNoSchedule"
  }
}

Then, if you need to add Whitelist IP for Control Plane, add this field to the main.tf file and reapply this file:

terraform {
  required_providers {
    vngcloud = {
      source  = "vngcloud/vngcloud"
      version = "1.2.2"
    }
  }
}

provider "vngcloud" {
  token_url        = "https://iamapis.vngcloud.vn/accounts-api/v2/auth/token"
  client_id        = var.client_id
  client_secret    = var.client_secret
  vserver_base_url = "https://hcm-3.api.vngcloud.vn/vserver/vserver-gateway"
  vlb_base_url     = "https://hcm-3.api.vngcloud.vn/vserver/vlb-gateway"
}

resource "vngcloud_vks_cluster" "primary" {
  name      = "my-cluster"
  description = "VNGCLOUD uses terraform"
  version = "v1.29.1"
  cidr      = "172.16.0.0/16"
  white_list_node_cidr = "172.25.32.1/16"
  enable_private_cluster = false
  network_type = "CALICO"
  vpc_id    = "net-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  subnet_id = "sub-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  enabled_load_balancer_plugin = true
  enabled_block_store_csi_plugin = true
}

resource "vngcloud_vks_cluster_node_group" "primary" {
  cluster_id= vngcloud_vks_cluster.primary.id
  name= "my-nodegroup"
  num_nodes = 3
  auto_scale_config {
    min_size = 0
    max_size = 5
  }
  upgrade_config {
    strategy = "SURGE"
    max_surge = 1
	max_unavailable = 0
  }
  image_id = "img-108b3a77-ab58-4000-9b3e-190d0b4b07fc"
  flavor_id = "flav-9e88cfb4-ec31-4ad4-8ba5-243459f6dc4b"
  disk_size = 20
  disk_type = "vtype-61c3fc5b-f4e9-45b4-8957-8aa7b6029018"
  enable_private_nodes = true
  ssh_key_id= "ssh-xxxxxxxx-xxxx-xxxxx-xxxx-xxxxxxxxxxxx"
  labels = {
    "mylabel" = "vngcloud"
  }
  taint {
    key    = "mykey"
    value  = "myvalue"
    effect = "PreferNoSchedule"
  }
}

Attention:

To get the image_id you want to use, you can access VKS Portal, select System Image menu and get the ID you want or get this information here .
To get the flavor_id you want to use for your Node group, please get the ID here .

Launch Terraform command

After completing the above information, run the command below:

terraform init

Then, to see the changes that will be applied to the resources that terraform is managing, you can run:

terraform plan

Finally, you choose to run the command line:

terraform apply

Select YES to initiate Cluster and Node Group via Terraform

Check the newly created Cluster on the VNG Cloud Portal interface

After successfully initializing Terraform, you can go to VKS Portal to view the newly created Cluster information.

See more about how to use Terraform to work with VKS here .

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