Enable SSH for Home Assistant PVE/QEMU virtual machine

pve-ha-ssh.sh

# HA VM has dropbear SSH server but it cannot start because there is no authorized_keys
# This scripts adds $SSH_KEY via USB config import.
# All commands run as root on a Proxmox host and checked with PVE 8.2.4 and HAOS 2024.6.4

# 1. Prepare USB stick image
dd if=/dev/zero of=usb-blk.img count=50 bs=4096
losetup -f ./usb-blk.img
# losetup created /dev/loop1

parted -s /dev/loop1 mklabel msdos
parted -s /dev/loop1 mkpart primary 1MiB 100%
mkfs.ext4 -n CONFIG /dev/loop1p1
mount /dev/loop1p1 /root/mnt
echo "${SSH_KEY}" > /root/mnt/authorized_keys
umount /root/mnt
losetup -d /dev/loop1

# 2. Mount the image as USB drive
VMID=100
qm monitor "${VMID}"
# the command above opens QEMU virtual manager CLI
drive_add 0 file=/root/usb-blk.img,if=none,id=drive-usb0,format=raw,cache=none
device_add usb-storage,id=drive-usb0,drive=drive-usb0,removable=on

# check a new usb device created successfully
info usb
quit

# 3. Import the key via VM console in PVE UI
# > ha login
ha os import
systemctl restart dropbear

# ensure dropbear started
systemctl status dropbear

# 4. ssh to the host to port 22222
ssh -p 2222 -i keyfile root@ha