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Excerpt

The available selectable options could also be checked using the Opnstack CLI commands :

Code Block
$ openstack keypair list $ openstack image list $ openstack flavor list $ openstack network list

Write configuration files

Create a directory for your configuration and change directory into it:

Code Block
$ mkdir example-magnum-k8s $ cd example-magnum-k8s

Create the main configuration file to define the infrastructure:

Code Block
$ touch main.tf

Open the main.tf file in a text editor and fill it as needed like in the following minimal example :

Code Block

terraform {
  required_providers {
    openstack = {
      source = "terraform-provider-openstack/openstack"
    }
  }
}

provider "openstack" {
  cloud = "openstack"
}

variable "magnum_cluster_template" {
  description = <<EOT
  The name of the Magnum cluster template to create the kubernetes cluster with

  You may view a list of available template by running `openstack coe cluster template list`
  EOT
  type        = string
  default     = "cluster-template-name"
}

data "openstack_containerinfra_clustertemplate_v1" "clustertemplate" {
  name = var.magnum_cluster_template
}

resource "openstack_containerinfra_cluster_v1" "cluster" {
  name                = "cluster-name"
  cluster_template_id = data.openstack_containerinfra_clustertemplate_v1.clustertemplate.id
  master_count        = "master-count"
  master_flavor       = "master-flavor-name"
  node_count          = "worker-node-count"
  flavor              = "worker-node-flavor-name"
  keypair             = "ssh-keypair-name"
  fixed_network       = "private-network-name"
  fixed_subnet        = "private-subnet-name"
  labels              = {
     monitoring_enabled   = "true"
     auto_healing_enabled = "true"
     }
  merge_labels        = "true"
  create_timeout      = "180"

}

Replace the following fields as desired:

cluster-template-name
cluster-name
master-count
master-flavor-name
worker-node-count
worker-node-flavor-name
ssh-keypair-name
private-network-name
private-subnet-name

For instance for ECMWF it can be :

Expand

title	Click here to expand the example...

Code Block

terraform {
  required_providers {
    openstack = {
      source = "terraform-provider-openstack/openstack"
    }
  }
}

provider "openstack" {
  cloud = "openstack"
}

variable "magnum_cluster_template" {
  description = <<EOT
  The name of the Magnum cluster template to create the kubernetes cluster with

  You may view a list of available template by running `openstack coe cluster template list`
  EOT
  type        = string
  default     = "kubernetes-1-32-jammy"
}

data "openstack_containerinfra_clustertemplate_v1" "clustertemplate" {
  name = var.magnum_cluster_template
}

resource "openstack_

compute

containerinfra_

instance

cluster_

v2

v1" "

test-server

cluster" {
  name                = "

test-server"

mycluster"
  cluster_template_id = data.openstack_containerinfra_clustertemplate_v1.clustertemplate.id

image

master_

name

count        = "

Rocky-9.4-20240717094419

3"
  master_flavor

_name

= "

2cpu

4cpu-

2gbmem

4gbmem-30gbdisk"

key

node_

pair

count          = "

mykey

2"
  flavor

security_groups

[

default", "ssh"] network {

4cpu-4gbmem-30gbdisk"
  keypair             = "mykeypair"
  fixed_network

name

 = "private-cci1-ewcloud-ms-nmhs-project"
  fixed_subnet        = "cci1-ewcloud-ms-nmhs-project-private"
  labels              = {
     monitoring_enabled   = "true"
     auto_healing_enabled = "true"
     }
  merge_labels        = "true"
  create_timeout      = "180"

}

Run Terraform or OpenTofu to create a Kubernetes cluster via OpenStack Magnum

Initialize the directory :

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Column

Terraform

Code Block
$ terraform init

Column

OpenTofu

Code Block
$ tofu init

Review the required changes:

Code Block
$ terraform plan

Apply the changes to create the Kubernetes cluster :

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border	true

Column

Terraform

Code Block
$ terraform apply

Column

OpenTofu

Code Block
$ tofu apply

Status can be then seen via:

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Column

Terraform

Code Block
$ terraform show

Column

OpenTofu

Code Block
$ tofu show

Destroy the Cluster

The created cluster can be then destroyed by simply running:

Section

border	true

Column

Terraform

Code Block
$ terraform destroy

Column

OpenTofu

Code Block
$ tofu destroy

...

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Write configuration files

Run Terraform or OpenTofu to create a Kubernetes cluster via OpenStack Magnum

Destroy the Cluster