Packer for Debian with Hyper-V "SSH Direct" fixes

README.md

Packer template for Debian with "SSH Direct" on Hyper-V

Output of this Packer template is Hyper-V Gen2 VM with Debian 10 that supports direct connection via vsock thus no internet connectivity is needed.

How to build

$key = "$env:USERPROFILE\.ssh\lab01_rsa"
$publicKey = Get-Content "$($key).pub"

packer build -force -var "ssh_key=$($publicKey)" packer-debian-10.json

How to connect

$vmName = "packer-deb-buster-tpl"
$key = "$env:USERPROFILE\.ssh\lab01_rsa"
hvc ssh -oLogLevel=ERROR -oStrictHostKeyChecking=no -i $key "packer@$vmName"

packer-debian-10.json

{
    "builders": [{
        "boot_command": [
            "<wait>c<wait>",
            "linux /install.amd/vmlinuz ",
            "auto=true ",
            "url=http://{{.HTTPIP}}:{{.HTTPPort}}//preseed.cfg ",
            "hostname={{user `vm_name`}} ",
            "domain={{user `domain`}} ",
            "interface=auto ",
            "vga=788 noprompt quiet --<enter>",
            "initrd /install.amd/initrd.gz<enter>",
            "boot<enter>"
        ],
        "boot_wait": "3s",
        "generation": 2,
        "headless": false,
        "http_directory": "http",
        "iso_checksum": "sha256:ab3763d553330e90869487a6843c88f1d4aa199333ff16b653e60e59ac1fc60b",
        "iso_url": "https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-10.4.0-amd64-netinst.iso",
        "output_directory": "output-debian-10",
        "shutdown_command": "echo 'packer' | sudo -S shutdown -P now",
        "ssh_password": "packer",
        "ssh_timeout": "1h",
        "ssh_username": "packer",
        "switch_name": "Default Switch",
        "type": "hyperv-iso",
        "vm_name": "packer-{{user `vm_name`}}"
    }],
    "provisioners": [{
            "inline": [
                "mkdir /home/packer/.ssh/",
                "echo '{{ user `ssh_key` }}' | tee /home/packer/.ssh/authorized_keys"
            ],
            "type": "shell"
        },
        {
            "destination": "/tmp/linux.pref",
            "source": "scripts/linux.pref",
            "type": "file"
        },
        {
            "inline": [
                "echo 'deb http://deb.debian.org/debian buster-backports main' | sudo tee /etc/apt/sources.list.d/backports.list",
                "sudo mv /tmp/linux.pref /etc/apt/preferences.d/linux.pref",
                "sudo apt update",
                "sudo apt upgrade -y"
            ],
            "type": "shell"
        },
        {
            "execute_command": "echo 'packer' | {{.Vars}} sudo -S -E bash '{{.Path}}'",
            "script": "scripts/efi.sh",
            "type": "shell"
        },
        {
            "inline": [
                "sudo cp /usr/lib/systemd/system/ssh.socket /usr/lib/systemd/system/ssh_vsock.socket",
                "sudo cp /usr/lib/systemd/system/[email protected] /usr/lib/systemd/system/[email protected]",
                "sudo sed -i 's/ListenStream=22/ListenStream=vsock::22/' /usr/lib/systemd/system/ssh_vsock.socket",
                "sudo systemctl disable ssh.service",
                "sudo systemctl enable ssh.socket",
                "sudo systemctl enable ssh_vsock.socket"
            ],
            "type": "shell"
        },
        {
            "inline": [
                "sudo sed -i -E 's/^#UseDNS.*$/UseDNS no/' /etc/ssh/sshd_config",
                "sudo sed -i -E 's/^(127\\.0\\.0\\.1[[:blank:]].*)$/\\1\\tUNKNOWN/' /etc/hosts",
                "echo 'hv_sock' | sudo tee /etc/modules-load.d/hv_sock.conf"
            ],
            "type": "shell"
        }
    ],
    "variables": {
        "domain": "template.local",
        "ssh_key": "",
        "vm_name": "deb-buster-tpl"
    }
}

Hello @mohamed3laa33, I am sorry for late response, you can find updated Packer template with inline definition of preferences in separate repo I created for templates https://github.com/microsoft/MSLab-templates/blob/main/templates/debian-11/debian-11.pkr.hcl#L105