Failing with 21.11

[PierreR]

If I use

{
  "variables": {
    "disk_size": "72000",
    "memory": "6800",
    "version": "21.11",
    "build": "334139.1bd4bbd49be",
    "checksum": "8259e4a841c624c98a02e24f35e8dfe3363af821cd31831c22b79414454e9379"
  },

The build is failing with

==> virtualbox-iso: Waiting 45s for boot...
==> virtualbox-iso: Typing the boot command...
==> virtualbox-iso: Using ssh communicator to connect: 127.0.0.1
==> virtualbox-iso: Waiting for SSH to become available...
==> virtualbox-iso: Error waiting for SSH: Packer experienced an authentication error when trying to connect via SSH. This can happen if your username/password are wrong. You may want to double-check your credentials as part of your debugging process. original error: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

If I revert back to 21.05 it works again.

Any idea about what would cause this failure ?

Thanks

[PierreR]

I wonder if this is not related to the update to openssh 8.8:

https://www.openssh.com/releasenotes.html
hashicorp/packer#10074

@zimbatm is it possible to change the rsa vagrant public key ?

[zimbatm]

Can you try setting services.openssh.extraConfig to

HostkeyAlgorithms +ssh-rsa
PubkeyAcceptedAlgorithms +ssh-rsa

and see if it fixes it?

[zimbatm]

I'm not really using nixbox and would be willing to pass on maintainership.

[PierreR]

It doesn't work probably because the ssh connection needs to be set up before configuration.nix is used

[stephank]

I'm not using nixbox, but am using Packer with EC2, and just PubkeyAcceptedAlgorithms is sufficient. I was able to solve it on EC2 with user_data, but not sure a similar mechanism exists for VirtualBox.

Maybe adding "temporary_key_pair_type": "ed25519" to the Packer builder config works? There's an open issue for the EC2 builder that this option is broken there, but maybe it doesn't affect VirtualBox or other builders. (hashicorp/packer-plugin-amazon#144)