boot iso url timeout when using iso_download_pve = true

[Dialgatrainer02]

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Overview of the Issue

when using iso_download_pve = true to download isos and skip the extra step of downloading locally first. packer times out but in the pve tasks it still shows the iso downloading. (also add a way to overwrite or reuse an image with the same name as waiting for packer to upload the same image while testing is painful)

Reproduction Steps

build a template with iso download pve on with slow internet and wait for it to timeout then go to proxmox web ui

Plugin and Packer version

v1.12.0

Simplified Packer Buildfile

build a vm using this boot_iso config

boot_iso {
    iso_checksum = "none"
    iso_url = "https://repo.almalinux.org/almalinux/9.5/isos/x86_64/AlmaLinux-9-latest-x86_64-boot.iso"
    iso_download_pve = true
    iso_storage_pool = "local"
    unmount = true
  }

Operating system and Environment details

proxmox version 8.2.2
host os: arch linux
iso image being downloaded almalinux 9.5

Log Fragments and crash.log files

PACKER_LOG=1 packer build -var-file=secrets.auto.pkrvars.hcl server.pkr.hcl
2025/02/19 21:02:11 [INFO] Packer version: 1.12.0 [go1.23.5 linux amd64]
2025/02/19 21:02:11 Detected xdg config directory from env var: /home/olivia/.config
2025/02/19 21:02:11 [INFO] PACKER_CONFIG env var not set; checking the default config file path
2025/02/19 21:02:11 [INFO] PACKER_CONFIG env var set; attempting to open config file: /home/olivia/.packerconfig
2025/02/19 21:02:11 [WARN] Config file doesn't exist: /home/olivia/.packerconfig
2025/02/19 21:02:11 Detected xdg config directory from env var: /home/olivia/.config
2025/02/19 21:02:11 [INFO] Setting cache directory: /home/olivia/.cache/packer
2025/02/19 21:02:11 Detected xdg config directory from env var: /home/olivia/.config
2025/02/19 21:02:11 [TRACE] listing potential installations for "github.com/hashicorp/proxmox" that match "~> 1". plugingetter.ListInstallationsOptions{PluginDirectory:"/home/olivia/.config/packer/plugins", BinaryInstallationOptions:plugingetter.BinaryInstallationOptions{APIVersionMajor:"5", APIVersionMinor:"0", OS:"linux", ARCH:"amd64", Ext:"", Checksummers:[]plugingetter.Checksummer{plugingetter.Checksummer{Type:"sha256", Hash:(*sha256.digest)(0xc000b82080)}}, ReleasesOnly:false}}
2025/02/19 21:02:11 [TRACE] Found the following "github.com/hashicorp/proxmox" installations: [{/home/olivia/.config/packer/plugins/github.com/hashicorp/proxmox/packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 v1.2.2 x5.0}]
2025/02/19 21:02:11 [INFO] found external [-packer-default-plugin-name- clone iso] builders from name plugin
2025/02/19 21:02:11 plugin "/home/olivia/.config/packer/plugins/github.com/hashicorp/proxmox/packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64" does not support Protobuf, forcing use of Gob
2025/02/19 21:02:11 [TRACE] listing potential installations for <nil> that match "". plugingetter.ListInstallationsOptions{PluginDirectory:"/home/olivia/.config/packer/plugins", BinaryInstallationOptions:plugingetter.BinaryInstallationOptions{APIVersionMajor:"5", APIVersionMinor:"0", OS:"linux", ARCH:"amd64", Ext:"", Checksummers:[]plugingetter.Checksummer{plugingetter.Checksummer{Type:"sha256", Hash:(*sha256.digest)(0xc0000b8600)}}, ReleasesOnly:false}}
2025/02/19 21:02:11 [INFO] found external [-packer-default-plugin-name- clone iso] builders from proxmox plugin
2025/02/19 21:02:11 found external [-packer-default-plugin-name- local] provisioner from ansible plugin
2025/02/19 21:02:11 [INFO] found external [-packer-default-plugin-name-] builders from lxc plugin
2025/02/19 21:02:11 [TRACE] validateValue: not active for pve_endpoint, so skipping
2025/02/19 21:02:11 [TRACE] validateValue: not active for pve_username, so skipping
2025/02/19 21:02:11 [TRACE] validateValue: not active for pve_password, so skipping
2025/02/19 21:02:11 [INFO] Starting external plugin /home/olivia/.config/packer/plugins/github.com/hashicorp/proxmox/packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 start builder iso
2025/02/19 21:02:11 Starting plugin: /home/olivia/.config/packer/plugins/github.com/hashicorp/proxmox/packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 []string{"/home/olivia/.config/packer/plugins/github.com/hashicorp/proxmox/packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64", "start", "builder", "iso"}
2025/02/19 21:02:11 Waiting for RPC address for: /home/olivia/.config/packer/plugins/github.com/hashicorp/proxmox/packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 Plugin address: unix /tmp/packer-plugin2870632782
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 Waiting for connection...
2025/02/19 21:02:11 Received unix RPC address for /home/olivia/.config/packer/plugins/github.com/hashicorp/proxmox/packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64: addr is /tmp/packer-plugin2870632782
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 Serving a plugin connection...
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 [TRACE] starting builder iso
2025/02/19 21:02:11 [DEBUG] - common: receiving ConfigSpec as gob
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 Number of sockets 0 is too small, using default: 1
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 OS not set, using default 'other'
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 Disk 0 format not set, using default 'raw'
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 Disk 0 cache mode not set, using default 'none'
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 SCSI controller not set, using default 'lsi'
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 Cloud-Init disk type not set, using default 'ide'
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 boot_iso device type not set, using default type 'ide' and index '2'
2025/02/19 21:02:11 [DEBUG] - common: receiving ConfigSpec as gob
a checksum is highly recommended.

  on server.pkr.hcl line 25:
  (source code not available)

2025/02/19 21:02:11 Build debug mode: false
2025/02/19 21:02:11 Force build: false
2025/02/19 21:02:11 On error: 
2025/02/19 21:02:11 Waiting on builds to complete...
2025/02/19 21:02:11 Starting build run: proxmox-iso.alma-kickstart
2025/02/19 21:02:11 Running builder: proxmox-iso
2025/02/19 21:02:11 [INFO] (telemetry) Starting builder proxmox-iso.alma-kickstart
Warning: A checksum of 'none' was specified. Since ISO files are so big,
a checksum is highly recommended.

  on server.pkr.hcl line 25:
  (source code not available)


proxmox-iso.alma-kickstart: output will be in this color.

2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 using password auth
2025/02/19 21:02:11 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:02:11 [INFO] - beginning download of https://repo.almalinux.org/almalinux/9.5/isos/x86_64/AlmaLinux-9-latest-x86_64-boot.iso to node pve1
2025/02/19 21:03:12 packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64 plugin: 2025/02/19 21:03:12 [ERROR] - failed to download iso from https://repo.almalinux.org/almalinux/9.5/isos/x86_64/AlmaLinux-9-latest-x86_64-boot.iso: Wait timeout for:UPID:pve1:001FD5E8:16CE17AD:67B646A6:download:AlmaLinux-9-latest-x86_64-boot.iso:root@pam:
2025/02/19 21:03:12 [INFO] (telemetry) ending proxmox-iso.alma-kickstart
==> Wait completed after 1 minute 1 second
2025/02/19 21:03:12 machine readable: error-count []string{"1"}
==> Some builds didn't complete successfully and had errors:
2025/02/19 21:03:12 machine readable: proxmox-iso.alma-kickstart,error []string{"failed to download ISO with all the provided URLs, attempted: https://repo.almalinux.org/almalinux/9.5/isos/x86_64/AlmaLinux-9-latest-x86_64-boot.iso"}
==> Builds finished but no artifacts were created.
2025/02/19 21:03:12 [INFO] (telemetry) Finalizing.
Build 'proxmox-iso.alma-kickstart' errored after 1 minute 1 second: failed to download ISO with all the provided URLs, attempted: https://repo.almalinux.org/almalinux/9.5/isos/x86_64/AlmaLinux-9-latest-x86_64-boot.iso

==> Wait completed after 1 minute 1 second

==> Some builds didn't complete successfully and had errors:
--> proxmox-iso.alma-kickstart: failed to download ISO with all the provided URLs, attempted: https://repo.almalinux.org/almalinux/9.5/isos/x86_64/AlmaLinux-9-latest-x86_64-boot.iso

==> Builds finished but no artifacts were created.
2025/02/19 21:03:13 waiting for all plugin processes to complete...
2025/02/19 21:03:13 /home/olivia/.config/packer/plugins/github.com/hashicorp/proxmox/packer-plugin-proxmox_v1.2.2_x5.0_linux_amd64: plugin process exited

task-pve1-download-2025-02-19T21_01_26Z.log

[JasonBrannon]

I ran into a very similar issue, although I don't have slow network speeds or a slow server, it was as if packer did not wait long enough on the acknowledgement from Proxmox confirming the ISO was downloaded.

This is all I added:

Increase the task timeout to allow enough time for a large ISO download.

task_timeout = "10m"

source "proxmox-iso" "ubuntu-template-builder" {
  # Boot command sent to the VM to begin installation.
  boot_command = [
    "c",
    "linux /casper/vmlinuz -- autoinstall ds='nocloud-net;s=http://{{ .HTTPIP }}:{{ .HTTPPort }}/'",
    "<enter><wait><wait>",
    "initrd /casper/initrd",
    "<enter><wait><wait>",
    "boot<enter>"
  ]

  # Increase the task timeout to allow enough time for a large ISO download.
  task_timeout = "10m"

  # Time to wait after the boot command is sent.
  boot_wait    = "10s"

  # CPU and memory configuration for the VM.
  cores        = 2
  memory       = 8192  # 8G

  # Disk configuration for the VM. This disk is where the OS will be installed.
  disks {
    disk_size    = "130G"
    format       = var.proxmox_storage_format
    storage_pool = var.proxmox_storage_pool  # Where the VM disk/template will be created.
    type         = "scsi"
  }

  # Network adapter configuration.
  network_adapters {
    bridge = "vmbr0"  # Proxmox network bridge.
  }

  # Proxmox node and API configuration.
  node            = var.proxmox_node
  proxmox_url     = var.proxmox_url
  scsi_controller = "virtio-scsi-single"  # SCSI controller model.

  # SSH configuration for connecting to the VM during provisioning.
  ssh_private_key_file = var.ssh_private_key_file
  ssh_port             = 22
  ssh_timeout          = "30m"
  ssh_username         = "ubuntu"  # Update with the appropriate username.

  # Template information for the final template.
  template_description = var.template_description
  template_name        = var.template_name

  # Proxmox API authentication settings.
  username = var.proxmox_username
  token    = var.proxmox_token

  # Boot ISO configuration. This tells Proxmox where to download and store the ISO.
  boot_iso {
    type             = "scsi"  # Bus type for mounting the ISO.
    # Construct the full ISO download URL from the base URL and file name.
    iso_url          = "${var.ubuntu_iso_base_url}${var.ubuntu_iso_file}"
    unmount          = true  # Unmount the ISO from the VM after installation.
    iso_checksum     = var.ubuntu_image_checksum  # ISO checksum (set to "none" to bypass verification).
    iso_storage_pool = var.proxmox_iso_storage_pool  # Storage pool where the ISO is stored.
    iso_download_pve = true  # Instruct Proxmox to download the ISO directly.
  }

  # HTTP directory for serving additional files (e.g., for cloud-init).
  http_directory           = "ubuntu2404/http"

  # Skip TLS verification if using self-signed certificates.
  insecure_skip_tls_verify = true
}