Packer.io DigitalOcean example

digitalocean

{
    "variables": {
        "do_api_key": "",
        "do_client_id": "",
        "do_droplet_name": "trusty-x86-64-{{timestamp}}",
        "do_private_networking": "false",
        "do_image": "ubuntu-14-04-x64",
        "do_region": "ams2",
        "do_size": "512MB"
    },
    "builders":[{
       "type": "digitalocean",
       "api_key": "{{user `do_api_key`}}",
       "client_id": "{{user `do_client_id`}}",
       "droplet_name": "{{user `do_droplet_name`}}",
       "private_networking": "{{user `do_private_networking`}}",
       "image": "{{user `do_image`}}",
       "region": "{{user `do_region`}}",
       "size": "{{user `do_size`}}"
    }]
}

packer build

packer build  -var 'do_client_id=CLIENT_ID'  -var 'do_api_key=API_KEY' digitalocean.json 
digitalocean output will be in this color.

==> digitalocean: Creating temporary ssh key for droplet...
==> digitalocean: Creating droplet...
==> digitalocean: Error creating droplet: Invalid size or lookup failure: '{{user `do_size`}}': Unknown size '{{user `do_size`}}'
==> digitalocean: Deleting temporary ssh key...
Build 'digitalocean' errored: Error creating droplet: Invalid size or lookup failure: '{{user `do_size`}}': Unknown size '{{user `do_size`}}'

==> Some builds didn't complete successfully and had errors:
--> digitalocean: Error creating droplet: Invalid size or lookup failure: '{{user `do_size`}}': Unknown size '{{user `do_size`}}'

==> Builds finished but no artifacts were created.

packer inspect

packer inspect digitalocean.json 
Optional variables and their defaults:

  do_api_key            = 
  do_client_id          = 
  do_droplet_name       = trusty-x86-64-{{timestamp}}
  do_image              = ubuntu-14-04-x64
  do_private_networking = false
  do_region             = ams2
  do_size               = 512MB

Builders:

  digitalocean

Provisioners:

  <No provisioners>

Note: If your build names contain user variables or template
functions such as 'timestamp', these are processed at build time,
and therefore only show in their raw form here.

packer validate

packer validate  -var 'do_client_id=CLIENT_ID'  -var 'do_api_key=API_KEY' digitalocean.json 
Template validated successfully.