When specifying ssh_private_key_file, is a public key supposed to be required?

[Jack Davidson]

I'm not sure if I have found a bug or if this is expected behavior. I expected the matching public key for the private key I passed to be generated and added to my instance automatically, since I saw no mention or ways of providing the public key. But it looks like this is not the behavior.

The situation is that when I specify 'ssh_private_key_file' in a gcp builder like this:

{

  "builders": [

    {

      "type": "googlecompute",

      "project_id": "redacted",

      "source_image": "ubuntu-1604-xenial-v20181204",

      "image_name": "my-packer-image",

      "disk_size": "50",

      "machine_type": "n1-standard-2",

      "communicator": "ssh",

      "ssh_username": "packer_user",

      "ssh_private_key_file": "./id_rsa.pem",

      "network": "packer-network",

      "zone": "us-west1-b",

      "state_timeout" : "15m",

      "instance_name" : "some-instance-name"

    }

  ]

}

The build fails, after timing out trying to connect over ssh:

SSH handshake err: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

I can make it succeed by manually adding the public key on instance metadata:

{

  "builders": [

    {

      "type": "googlecompute",

      "project_id": "redacted",

      "source_image": "ubuntu-1604-xenial-v20181204",

      "image_name": "my-packer-image",

      "disk_size": "50",

      "machine_type": "n1-standard-2",

      "communicator": "ssh",

      "ssh_username": "packer_user",

      "ssh_private_key_file": "./id_rsa.pem",

      "network": "packer-network",

      "zone": "us-west1-b",

      "state_timeout" : "15m",

      "instance_name" : "some-instance-name",

      "metadata" : {

        "ssh-keys": "packer_user:ssh-rsa [ssh public key data] packer_user"

      }

    }

  ]

}

Is this expected?

[Rickard von Essen]

Yes that's the expected and correct behavior. 

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