Getting started: the compute service

You'll need a DigitalOcean account and an API token to use this provider.

Get one from cloud.digitalocean.com/settings/tokens/new

Write down the Access Token.

Connecting, retrieving and managing server objects

Before we start, I guess it will be useful to the reader to know that Fog servers are 'droplets' in DigitalOcean's parlance. 'Server' is the Fog way to name VMs, and we have respected that in the DigitalOcean's Fog provider.

First, create a connection to the host:

require 'fog'

docean = Fog::Compute.new({
  :provider => 'DigitalOcean',
  :version  => 'V2',
  :digitalocean_token   => 'poiuweoruwoeiuroiwuer', # your Access Token here
})

SSH Key Management

Access to DigitalOcean servers can be managed with SSH keys. These can be assigned to servers at creation time so you can access them without having to use a password.

Creating a key:

docean.ssh_keys.create(
  :name        => 'Default SSH Key',
  :ssh_pub_key => File.read('~/.ssh/id_rsa.pub'))
)

Listing all keys:

docean.ssh_keys.each do | key |
  puts key.name
  puts key.public_key
  puts key.id
end

Destroying a key:

docean.ssh_keys.destroy(:id => '27100')

Listing servers

Listing servers and attributes:

docean.servers.each do |server|
  # remember, servers are droplets
  puts server.id
  puts server.name
  puts server.status
  puts (server.image['slug'] || server.image['name']) # slug is only for public images, private images use name
  puts server.size['slug']
  puts server.region['slug']
end

Server creation and life-cycle management

Creating a new server (droplet):

server = docean.servers.create :name => 'foobar',
                               # use the last image listed
                               :image  => docean.images.last.id,
                               # use the first flavor (aka size) listed
                               :size => docean.flavors.first.slug,
                               # use the first region listed
                               :region => docean.regions.first.slug

The server is automatically started after that.

We didn't pay attention when choosing the flavor, image and region used but you can easily list them too, and then decide:

docean.images.each do |image|
  puts image.id
  puts image.name
  puts image.distribution
end

docean.flavors.each do |flavor|
  puts flavor.slug
end

docean.regions.each do |region|
  puts region.slug
end

Rebooting a server:

server = docean.servers.first
server.reboot

Power cycle a server:

server.power_cycle

Destroying the server:

server.destroy