Stuck at 'Waiting for SSH to become available...' when building Ubuntu VM using Packer

[YashPimple]

I'm encountering an issue while building an Pytorch-Ubuntu VM using Packer. The process seems to get stuck at the 'Waiting for SSH to become available...' step and doesn't proceed further. I've provided my pytorch-ubuntu.pkr.hcl file for reference.

packer {
  required_plugins {
    qemu = {
      version = "~> 1"
      source  = "github.com/hashicorp/qemu"
    }
  }
}

variable "pytorch_version" {
  default = "2.2.0"
}

source "qemu" "pytorch" {
  iso_url        = "https://cloud-images.ubuntu.com/releases/22.04/release/ubuntu-22.04-server-cloudimg-amd64.img"
  iso_checksum   = "sha256:9f8a0d84b81a1d481aafca2337cb9f0c1fdf697239ac488177cf29c97d706c25"
  ssh_username   = "root"
  format         = "qcow2"
  vm_name        = "pytorch-ubuntu-vm"
  net_device     = "virtio-net"
  disk_interface = "virtio"
  boot_wait      = "10s"
  headless       = "true"
  memory         = 2048
}

build {
  sources = ["source.qemu.pytorch"]

  provisioner "shell" {
    inline = [
      "sudo apt update",
      "sudo apt install -y python3-pip",
      "pip3 install torch==${var.pytorch_version}",
    ]
  }

  provisioner "shell" {
    inline = ["echo Running ${var.pytorch_version} VM image."]
  }
}

Expected Behavior:
The Packer build process should proceed beyond the 'Waiting for SSH to become available...' stage and complete successfully.

Actual Behavior:
The process gets stuck at the SSH waiting stage.

[github-actions]

Hi 👋 thanks for reaching out.

For general questions we recommend reaching out to the [community forum](https://discuss.hashicorp.com/c/packer) for greater visibility.
As the GitHub issue tracker is only watched by a small subset of maintainers and is really reserved for bugs and enhancements, you'll have a better chance of finding someone who can help you in the forum.
We'll mark this issue as needs-reply to help inform maintainers that this question is awaiting a response.
If no activity is taken on this question within 30 days it will be automatically closed.

If you find the forum to be more helpful or if you've found the answer to your question elsewhere please feel free to post a response and close the issue.

[deric]

@YashPimple You can't connect via ssh, if there is no sshd running or no network available.

Shell provisioner is using ssh communicator, but you don't have username/password or ssh keys configured yet.

See e.g. qemu example

the boot_command is used to configure ssh server (in preseed.cfg)

d-i pkgsel/include string openssh-server

and also configures username and password. Have a look at debugging logs:

PACKER_LOG=1 packer build pytorch-ubuntu.pkr.hcl

[github-actions]

Hi,

This issue has not received any update in the last 3 weeks, and will automatically be closed in 7 days if it does not receive any activity by then.

If you find the community forum to be more helpful or if you've found the answer to your question elsewhere please feel free to post a response and close the issue.

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.