KVMでTerraform入門してみた(libvirt-provider)

目的

卒業研究の一環で、最終的にKubernetesの自動クラスタ構築を行う事が出来るソリューションを作らなければならない。プロビジョニングはterraformで行いたいと考えている。

インストール

以下参考

$ sudo apt-get -y update && sudo apt-get install -y gnupg software-properties-common
wget -O- https://apt.releases.hashicorp.com/gpg | \
gpg --dearmor | \
sudo tee /usr/share/keyrings/hashicorp-archive-keyring.gpg
gpg --no-default-keyring \
--keyring /usr/share/keyrings/hashicorp-archive-keyring.gpg \
--fingerprint
echo "deb [signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] \
https://apt.releases.hashicorp.com $(lsb_release -cs) main" | \
sudo tee /etc/apt/sources.list.d/hashicorp.list
sudo apt update
sudo apt-get -y install terraform

/etc/libvirt/qemu.confの設定変更

security_driver = "none"に変更する。
libvirtのリスタートは以下コマンドより

sudo systemd restart libvirt-bin

確認

$ terraform -v
Terraform v1.5.0
on linux_amd64

libvirt-providerのインストール

provider.tf

terraform {
  required_providers {
    libvirt = {
      source = "dmacvicar/libvirt"
      version = "0.7.1"
    }
  }
}

操作する対象が別ホストの場合

provider.tf

provider "libvirt" {
  uri = "qemu+ssh://shoma@172.24.20.3/system"
}

構成ファイルの最小構成

main.tf

provider "libvirt" {
  uri = "qemu+ssh://shoma@172.24.20.3/system"
}

resource "libvirt_volume" "os-image" {
  name = "terraform-disk.qcow2"
  source = "https://cloud-images.ubuntu.com/bionic/current/bionic-server-cloudimg-amd64.img"
  format = "qcow2"
}

resource "libvirt_domain" "domain-testvm" {
  name = "ubuntu-terraform"
  memory = 2048
  vcpu = 2

  disk { volume_id = libvirt_volume.os-image.id }

  network_interface {
    network_name = "default"
  }

  console {
    type = "pty"
    target_port = "0"
  }

  graphics {
    type = "spice"
    listen_type = "address"
    autoport = "true"
  }
}

確認

root@r620-shoma-001:/home/shoma/terraform# virsh list
 Id    Name                    State
----------------------------------------
223   ubuntu-terraform-1      running

複数台のVMを作成する

main.tf

provider "libvirt" {
  uri = "qemu+ssh://shoma@172.24.20.3/system"
}

resource "libvirt_volume" "os-image" {
  count = 3
  name   = "${format("terraform-vm%02d.qcow2", count.index + 1)}"
  source = "https://cloud-images.ubuntu.com/bionic/current/bionic-server-cloudimg-amd64.img"
  format = "qcow2"
}

resource "libvirt_domain" "terraform-vm" {
  count = 3
  name = "${format("ubuntu-terraform%02d", count.index + 1)}"
  memory = 2048
  vcpu = 2

  disk { volume_id = libvirt_volume.os-image[count.index].id }

  network_interface {
    network_name = "default"
  }

  console {
    type = "pty"
    target_port = "0"
  }

  graphics {
    type = "spice"
    listen_type = "address"
    autoport = "true"
  }
}

確認

root@r620-shoma-001:/home/shoma/terraform# virsh list
 Id    Name                    State
----------------------------------------
 237   ubuntu-terraform02      running
 238   ubuntu-terraform03      running
 239   ubuntu-terraform01      running

参考文献