Rapid VM Deployment with Cloud Init and Terraform

Sources

• how to create a proxmox ubuntu cloud init image
• how to deploy VMs in proxmox with terraform
• https://www.learnlinux.tv/proxmox-ve-how-to-build-an-ubuntu-22-04-template-updated-method/

Get the OS Image

Use Proxmox GUI to download 20.04 server cloud image. Alternatively use 22.04 server cloud image or 22.04 minimal image

Customize the Image

Prerequisite: libguestfs-tools.

apt update -y && apt install libguestfs-tools -y

Locate the downloaded image in /var/lib/vz/template/iso:

root@duo:/var/lib/vz/template/iso# ls -la
total 7551428
drwxr-xr-x 2 root root       4096 May  5 09:35 .
drwxr-xr-x 4 root root       4096 Jan 25  2022 ..
-rw-r--r-- 1 root root  950337536 May  5 09:43 focal-server-cloudimg-amd64.img
-rw-r--r-- 1 root root 3674746880 Apr 19  2022 kubuntu-22.04-desktop-amd64.iso
-rw-r--r-- 1 root root 2312994816 Jun  4  2022 nixos-gnome-x86_64-linux.iso

Customize the downloaded image using virt-customize:

virt-customize -a focal-server-cloudimg-amd64.img \
  --install qemu-guest-agent,jq,htop --root-password password:PASSWORD

Create a Proxmox VM

qm create 9000 --name "ubuntu-2004-cloudinit-template" --memory 1024 --cores 2 --net0 virtio,bridge=vmbr0
qm importdisk 9000 focal-server-cloudimg-amd64.img local-lvm
qm set 9000 --scsihw virtio-scsi-pci --scsi0 local-lvm:vm-9000-disk-0
qm set 9000 --boot c --bootdisk scsi0
qm disk resize 9000 scsi0 32G
qm set 9000 --ide2 local-lvm:cloudinit
qm set 9000 --serial0 socket --vga serial0
qm set 9000 --agent 1

Also in GUI change:

• OS type
• Inform scsi0 as SSD
• Change NIC to use DHCP

Convert the VM into a Template

qm template 9000

Test VM Creation from Template

qm clone 9000 999 --name test-clone-cloud-init
qm set 999 --sshkey ~/.ssh/id_rsa.pub
qm set 999 --ipconfig0 ip=192.168.10.96/24,gw=192.168.10.1
qm start 999

Now login into the newly created VM. First remove known host because SSH key changed:

ssh-keygen -f "~/.ssh/known_hosts" -R 192.168.10.96

Now we can procceed with login:

ssh -i ~/.ssh/id_rsa ubuntu@192.168.10.96

VM Cleanup

qm stop 999 && qm destroy 999

Terraform Install

moved here

Terraform Plan

Customize it.

Testing

root@duo:~/terraform# ssh -i ~/.ssh/id_rsa ubuntu@192.168.10.81
Welcome to Ubuntu 20.04.3 LTS (GNU/Linux 5.4.0-89-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  System information as of Fri Oct 22 22:39:40 UTC 2021

  System load:  0.0               Processes:             122
  Usage of /:   18.2% of 9.52GB   Users logged in:       0
  Memory usage: 9%                IPv4 address for eth0: 192.168.10.81
  Swap usage:   0%


0 updates can be applied immediately.


Last login: Fri Oct 22 22:38:00 2021 from 192.168.10.40
ubuntu@test-vm-1:~$ uptime
 22:40:30 up 1 min,  1 user,  load average: 0.00, 0.00, 0.00
ubuntu@test-vm-1:~$ exit
logout
Connection to 192.168.10.81 closed.

Clean-up

Edit main.tf ans set count to 0. Then:

oot@duo:~/terraform# terraform apply
proxmox_vm_qemu.test_server[0]: Refreshing state... [id=duo/qemu/100]

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following
symbols:
  - destroy

Terraform will perform the following actions:

  # proxmox_vm_qemu.test_server[0] will be destroyed
  - resource "proxmox_vm_qemu" "test_server" {
    ....
    }

Plan: 0 to add, 0 to change, 1 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

proxmox_vm_qemu.test_server[0]: Destroying... [id=duo/qemu/100]
proxmox_vm_qemu.test_server[0]: Destruction complete after 4s

Apply complete! Resources: 0 added, 0 changed, 1 destroyed.

console