LXD Ubuntu VM launch and disk resize

launch_vm.sh

#!/bin/env bash

set -e

readonly VM="banana"
readonly CPU="8"
readonly MEM="8GB"
readonly DSK="120GB"

lxc init images:ubuntu/focal ${VM} -p default -p vm --vm
lxc config set ${VM} limits.cpu ${CPU}
lxc config set ${VM} limits.memory ${MEM}
lxc config device override ${VM} root size=${DISK}
lxc start ${VM}

sleep 10  # `lxc start` needs a `--wait`.

lxc exec ${VM} -- apt update
lxc exec ${VM} -- apt install cloud-initramfs-growroot -y
lxc exec ${VM} -- growpart /dev/sda 2
lxc exec ${VM} -- resize2fs /dev/sda2

vm-lxd-profile.yaml

config:
  user.user-data: |
    apt_mirror: http://us.archive.ubuntu.com/ubuntu/
    ssh_pwauth: yes
    users:
      - name: ubuntu
        passwd: "\$6\$s.wXDkoGmU5md\$d.vxMQSvtcs1I7wUG4SLgUhmarY7BR.5lusJq1D9U9EnHK2LJx18x90ipsg0g3Jcomfp0EoGAZYfgvT22qGFl/"
        lock_passwd: false
        groups: lxd
        shell: /bin/bash
        sudo: ALL=(ALL) NOPASSWD:ALL

    growpart:
      mode: auto
      devices:
        - '/'
        - '/dev/sda'
        - '/dev/sda2'
      ignore_growroot_disabled: false
description: VN profile
devices:
  config:
    source: cloud-init:config
    type: disk
  eth0:
    nictype: bridged
    parent: lxdbr0
    type: nic
  root:
    path: /
    pool: default
    size: 100GB
    type: disk
name: vm

Agreed. I spent all morning looking for this!

I do have one question though. I changed the user from "ubuntu" to "tux" because that's my preferred generic user, but tux isn't created but there is still an ubuntu user. Any suggestions?

For newer LXD versions (5.8 and LTS 5.0.2) you can use the -d flag to increase the disk size of LXD virtual machines:

lxc launch "images:ubuntu/jammy/cloud" jammy --vm -c limits.cpu=4 -c limits.memory=8GiB -d root,size=50GiB

I tested this with version 5.0.2-838e1b2 👍

See also:

• https://discuss.linuxcontainers.org/t/lxd-5-8-has-been-released/15686#device-override-on-init-and-launch-4
• https://discuss.linuxcontainers.org/t/lxd-vm-how-to-set-disk-size/7566/6

When I try to apply the above mentioned profile sudo lxc launch images:ubuntu/22.04 w1 -p myprofile the commands inside user.user-data do not get applied. My custom limits like cpus and RAM is respected but root size and installing packages defined within user.user-data do not work. I am using lxd 5.10. Do you guys have any experience with this kind of error?

Is there a way in the profile to have the VM be configured with LVM partitioning?

Something like this (as an example):

profiles:
  - name: lma-vm
    config:
      limits.cpu: "2"
      limits.memory: 16GB
      security.secureboot: "false"
    description: "LVM Configuration for LMA Platform"
    devices:
      root:
        path: /
        pool: default
        size: 80GB
        type: disk
      eth0:
        name: eth0
        nictype: bridged
        parent: lxdbr0
        type: nic
      storage:
        config:
          ptable: gpt
          path: /dev/sda
          wipe: superblock-recursive
          preserve: false
          grub_device: true
          type: disk
          id: disk-sda
          partitions:
            - number: 1
              device: disk-sda
              flag: bios_grub
              size: 1M
              id: bios-grub
              type: partition
            - number: 2
              device: disk-sda
              flag: boot
              size: 1G
              id: sda-boot
              type: partition
            - number: 3
              device: disk-sda
              size: -1
              id: sda-lvm
              type: lvm_volgroup
              name: vg00
              devices: [sda-lvm]
              partitions:
                - id: lvroot
                  name: lvroot
                  size: 20G
                  type: lvm_partition
                  volgroup: vg00