support packer build with ipv6 only

[kranurag7]

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Description

As of now, when I run packer build, the server gets ipv4 and ipv6 address both. I would like to avoid ipv4 here.

Use Case(s)

I'm hitting limit on my project where I cannot have more ipv4 addresses.

Could not create server: Primary IP limit exceeded (resource_limit_exceeded)

Independent of this as well I think it will be great if the project supports that.

Potential configuration

Potential References

[kranurag7]

@jooola thanks for working on it.

I'm getting timed out if I use the following:

• packer config (I'm using @apricote flatcar packer config here)
• I've include one extra line public_ipv4_disabled = true and so far I can see that the builder doesn't get ipv4 address but it also gets ssh connection timed out.
• In the project, I don't have any other servers running if that's required.

Details

packer {
  required_plugins {
    hcloud = {
      source  = "github.com/hetznercloud/hcloud"
      version = "~> 1.5.0"
    }
  }
}

variable "hcloud_token" {
  type      = string
  default   = "${env("HCLOUD_TOKEN")}"
  sensitive = true
}

variable "hcloud_server_type" {
  type = map(string)
  default = {
    # x86 = "cx11"
    arm = "cax11"
  }
}

variable "channel" {
  type    = string
  default = "beta"
}

variable "version" {
  type    = string
  default = "current"
}

variable "labels" {
  // Available replacements:
  // $architecture
  // $channel
  // $version - if "current" was specified, this is resolved to the actual version
  type = map(string)
  default = {
    os              = "flatcar"
    flatcar-channel = "$channel"
    version         = "$version"
    architecture    = "$architecture"
  }
}

locals {
  architectures = ["x86", "arm"]

  // If the user wants the "current" version, we still want to make the
  // actual version id available through labels + snapshot description
  //
  // regex matches: FLATCAR_VERSION=1234.0.0
  version = regex("FLATCAR_VERSION=(\\d+\\.\\d+\\.\\d+)", data.http.version_info.body)[0]
}

data "http" "version_info" {
  // We assume that both boards have the same version
  url = "https://${var.channel}.release.flatcar-linux.net/amd64-usr/${var.version}/version.txt"
}

source "hcloud" "flatcar" {
  token = var.hcloud_token

  image    = "ubuntu-22.04"
  location = "fsn1"
  rescue   = "linux64"

  ssh_username = "root"
}


build {
  dynamic "source" {
    for_each = local.architectures
    labels   = ["hcloud.flatcar"]

    content {
      name          = source.value
      server_type   = var.hcloud_server_type[source.value]
      snapshot_name = "flatcar-${var.channel}-${local.version}-${source.value}"
      public_ipv4_disabled = true

      snapshot_labels = {
        for k, v in var.labels : k => replace(replace(replace(v,
          "$channel", var.channel),
          "$version", local.version),
          "$architecture", source.value)
      }
    }
  }

  provisioner "shell" {
    inline = [
      # Download script and dependencies
      "apt-get -y install gawk",
      "curl -fsSLO --retry-delay 1 --retry 60 --retry-connrefused --retry-max-time 60 --connect-timeout 20 https://github.com/flatcar/init/flatcar-master/bin/flatcar-install",
      "chmod +x flatcar-install",

      # Install flatcar
      "./flatcar-install -s -o hetzner -C ${var.channel} -V ${var.version} ",
    ]
  }
}

• build logs

hcloud.arm: output will be in this color.

==> hcloud.arm: Validating server types: cax11
==> hcloud.arm: Validating snapshot name: flatcar-beta-3941.1.0-arm
==> hcloud.arm: Creating temporary RSA SSH key for instance...
==> hcloud.arm: Uploading temporary SSH key for instance...
==> hcloud.arm: Creating server...
    hcloud.arm: Using image '103908130'
==> hcloud.arm: Enabling Rescue Mode...
==> hcloud.arm: Rebooting server...
==> hcloud.arm: Using SSH communicator to connect: 2a01:4f8:c013:4a59::
==> hcloud.arm: Waiting for SSH to become available...
==> hcloud.arm: Timeout waiting for SSH.
==> hcloud.arm: Destroying server...
==> hcloud.arm: Deleting temporary SSH key...
Build 'hcloud.arm' errored after 5 minutes 30 seconds: Timeout waiting for SSH.

==> Wait completed after 5 minutes 30 seconds

==> Some builds didn't complete successfully and had errors:
--> hcloud.arm: Timeout waiting for SSH.

==> Builds finished but no artifacts were created.

[jooola]

Hmm, the ipv6 address is not right. I'll have look.

[jooola]

Will be fixed with #192

[kranurag7]

Hey @jooola I'm still facing this issue. I am using packer latest version and packer-plugin-hcloud is also on latest which is 1.5.1

environment details

$ packer version
Packer v1.11.0
$ packer plugins installed
/home/k7/.config/packer/plugins/github.com/hetznercloud/hcloud/packer-plugin-hcloud_v1.5.1_x5.0_linux_amd64

scenario 1

$ packer validate foo.json
The configuration is valid.
$ packer build foo.json
hcloud: output will be in this color.

==> hcloud: Validating server types: cx41
==> hcloud: Validating snapshot name: packer-1717664956
==> hcloud: Creating temporary RSA SSH key for instance...
==> hcloud: Uploading temporary SSH key for instance...
==> hcloud: Creating server...
    hcloud: Using image '67794396'
==> hcloud: Using SSH communicator to connect: 2a01:4f8:c013:3d45::1
==> hcloud: Waiting for SSH to become available...
==> hcloud: Timeout waiting for SSH.
==> hcloud: Destroying server...
==> hcloud: Deleting temporary SSH key...
Build 'hcloud' errored after 5 minutes 18 seconds: Timeout waiting for SSH.

==> Wait completed after 5 minutes 18 seconds

==> Some builds didn't complete successfully and had errors:
--> hcloud: Timeout waiting for SSH.

==> Builds finished but no artifacts were created.

the foo.json file contains "public_ipv4_disabled": true, in builders block.

• hcloud server list

$ hcloud server list
ID         NAME                                          STATUS    IPV4   IPV6                      PRIVATE NET   DATACENTER   AGE
48415982   packer-66617cbc-4945-bf22-9ad2-4319d0ac68e4   running   -      2a01:4f8:c013:3d45::/64   -             fsn1-dc14    2m

scenario 2 (using Julian's flatcar repository )

hcloud.arm: output will be in this color.

==> hcloud.arm: Validating server types: cax11
==> hcloud.arm: Validating snapshot name: flatcar-beta-3941.1.0-arm
==> hcloud.arm: Creating temporary RSA SSH key for instance...
==> hcloud.arm: Uploading temporary SSH key for instance...
==> hcloud.arm: Creating server...
    hcloud.arm: Using image '103908130'
==> hcloud.arm: Enabling Rescue Mode...
==> hcloud.arm: Rebooting server...
==> hcloud.arm: Using SSH communicator to connect: 2a01:4f8:c013:4a59::1
==> hcloud.arm: Waiting for SSH to become available...
==> hcloud.arm: Timeout waiting for SSH.
==> hcloud.arm: Destroying server...
==> hcloud.arm: Deleting temporary SSH key...
Build 'hcloud.arm' errored after 5 minutes 27 seconds: Timeout waiting for SSH.

==> Wait completed after 5 minutes 27 seconds

==> Some builds didn't complete successfully and had errors:
--> hcloud.arm: Timeout waiting for SSH.

==> Builds finished but no artifacts were created.

Here I've included public_ipv4_disabled = true in the packer configuration and updated the required version to be version = "~> 1.5.1"

• hcloud server list for scenario 2

$ hcloud server list
ID         NAME                                          STATUS    IPV4   IPV6                      PRIVATE NET   DATACENTER   AGE
48416165   packer-66617d26-bb6b-5ddf-bbb6-185924f752c3   running   -      2a01:4f8:c013:4a59::/64   -             fsn1-dc14    1m

Extra details

• I'm working on a fresh project, where there's no per-existing server and there's not any other hcloud resource as well. I just created a project, copy pasted the token and ran packer build.

[jooola]

I'll have a look.

[jooola]

I am having the following errors:

==> hcloud.example: Waiting for SSH to become available...
2024/06/06 10:00:10 packer-plugin-hcloud_v1.5.1_x5.0_linux_amd64 plugin: 2024/06/06 10:00:10 [DEBUG] TCP connection to SSH ip/port failed: dial tcp: address 2a01:4f9:c012:e095::1:22: too many colons in address
2024/06/06 10:00:15 packer-plugin-hcloud_v1.5.1_x5.0_linux_amd64 plugin: 2024/06/06 10:00:15 [DEBUG] TCP connection to SSH ip/port failed: dial tcp: address 2a01:4f9:c012:e095::1:22: too many colons in address
2024/06/06 10:00:20 packer-plugin-hcloud_v1.5.1_x5.0_linux_amd64 plugin: 2024/06/06 10:00:20 [DEBUG] TCP connection to SSH ip/port failed: dial tcp: address 2a01:4f9:c012:e095::1:22: too many colons in address
2024/06/06 10:00:25 packer-plugin-hcloud_v1.5.1_x5.0_linux_amd64 plugin: 2024/06/06 10:00:25 [DEBUG] TCP connection to SSH ip/port failed: dial tcp: address 2a01:4f9:c012:e095::1:22: too many colons in address

The ipv6 is not properly formatted, should be between brackets : [2a01:4f9:c012:e095::1]:22

I believe this is a packer bug. I'll dig some more on the packer side.

[jooola]

We will have to wait for hashicorp/packer-plugin-sdk#246 to be merged and released. Might take some time.

[jooola]

I was able to build with an ipv6 only server using the new plugin release v1.5.2.

[kranurag7]

Thanks very much @jooola, I've tested it and it works good on my end too.