Module: Stack

Defined in:
lib/stack.rb

Constant Summary collapse

Logger = 
Logger.new(STDOUT)
@@gemhome = 
File.absolute_path(File.realpath(File.dirname(File.expand_path(__FILE__)) + '/..'))

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.connect(config) ⇒ Object 



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# File 'lib/stack.rb', line 24

def Stack.connect(config)
  connection = Fog::Compute.new({ :provider => config[:provider],
                                  :aws_access_key_id => config[:aws_access_key_id],
                                  :aws_secret_access_key => config[:aws_secret_access_key],
                                  :region => config[:region] })
  connection
end

.delete_node(config, fqdn) ⇒ Object 



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# File 'lib/stack.rb', line 212

def Stack.delete_node(config, fqdn)
  running_instances = Stack.get_running(config)
  if running_instances[fqdn].nil?
    puts "ERROR: #{fqdn} isn't running!"
    exit
  else
    Stack.connect(config)
    pp running_instances[fqdn]
    running_instances[fqdn].destroy
  end
end

.deploy_all(config) ⇒ Object 



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# File 'lib/stack.rb', line 67

def Stack.deploy_all(config)
  # generate the hostnames & details from the config & apply defaults where required
  Stack.populate_config(config)

  # create a connection
  connection = Stack.connect(config)

  running_instances = Stack.get_running(config)
  config[:roles].each do |role, role_details|
    hostname = role.to_s
    fqdn = role.to_s + '.' + config[:dns_domain]

    if !running_instances[fqdn].nil?
      Logger.info "Skipping creation od #{fqdn} instance as it already exists"
      server = running_instances[fqdn]
    else
      # Ubuntu 8.04/Hardy doesn't do full cloud-init, so we have to script setting the hostname
      libdir = File.realpath(@@gemhome + '/lib')

      bootstrap_abs = Stack.find_file(config, config[:node_details][fqdn][:bootstrap])
      cloud_config_yaml_abs = Stack.find_file(config, config[:node_details][fqdn][:cloud_config_yaml])

      if config[:mime_encode_user_data]
        Logger.debug "mime encoding user-data..."
        multipart_cmd = "#{libdir}/write-mime-multipart #{bootstrap_abs} #{cloud_config_yaml_abs}"
        user_data = `#{multipart_cmd}`
      else
        # Ubuntu Hardy seems to struggle with some mime-encoded user-data
        # so allow the user to forse submitting user-data un-mimed,
        # in which case we can only pass one file & it must be the bootstrap script
        Logger.debug "mime encoding user-data disabled, only sending the bootstrap script"
        user_data = File.read(bootstrap_abs)
      end

      user_data.gsub!(/rentpro-unconfigured/, hostname)
      user_data.gsub!(/rentpro-stage.local/, config[:dns_domain])


      # pp multipart
      #
      puts "Bootstraping new instance - #{fqdn}, in #{config[:availability_zone]}, flavor #{config[:node_details][fqdn][:flavor_id]}, image_id #{config[:image_id]}"
      server = connection.servers.create({
                                        :name => fqdn,
                                        :hostname => fqdn,
                                        :availability_zone => config[:availability_zone],
                                        :flavor_id => config[:node_details][fqdn][:flavor_id],
                                        :image_id => config[:image_id],
                                        :key_name => config[:keypair],
                                        :user_data => user_data,
                                        :tags => { 'Name' => fqdn },
                                        })

      print "Waiting for instance to be ready..."
      server.wait_for { ready? }
      puts "#{role.to_s} is booted, #{server.public_ip_address}/#{server.private_ip_address}"
    end

    if config[:maintain_dns]
      Logger.info "Updating DNS for #{fqdn}"
      # create/update the public & private DNS for this host
      Stack.update_dns(role.to_s + '-public.' + config[:dns_domain], server.public_ip_address, config)
      Stack.update_dns(role.to_s + '-private.' + config[:dns_domain], server.private_ip_address, config)

      # create the dns
      if (role_details[:publish_private_ip] == true && (!role_details[:publish_private_ip].nil?))
        ip_address = server.private_ip_address
      else
        ip_address = server.public_ip_address
      end
      Stack.update_dns(fqdn, ip_address, config)
      #
      # is this a wildcard DNS host, then claim the *.domain.net
      if (role_details[:dns_wildcard] == true && (!role_details[:dns_wildcard].nil?))
        wildcard = "*." + config[:dns_domain]
        Stack.update_dns(wildcard, ip_address, config)
      end
    end
  end
end

.find_file(config, filename) ⇒ Object 



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# File 'lib/stack.rb', line 262

def Stack.find_file(config, filename)
  # find a file, using the standard path precedence
  # 1) cwd
  # 2) stackhome
  # 2) stackhome + find_file_paths
  # 3) gemhome/lib

  if filename.nil? || filename.empty?
    raise ArgumentError
  end

  dirs = [ '.' ]  # current directory
  dirs.push(config[:stackhome])
  config[:find_file_paths].each { |fp| dirs.push(File.join(config[:stackhome], fp)) }
  dirs.push(File.join(@@gemhome, 'lib'))
  dirs.push('')   # find absolute paths
  dirs.flatten!

  Logger.debug "find_file, looking for #{filename} in #{dirs}"
  filename_fqp = ''
  dirs.each do |dir|
    fqp = File.join(dir, filename)
    Logger.debug "find_file: checking #{fqp}"
    if File.file?(fqp)
    Logger.debug "find_file: found #{fqp}!"
      filename_fqp =  File.expand_path(fqp)
    end
  end

  if filename_fqp.empty?
    Logger.warn "couldn't find #{filename} in #{dirs}"
    filename_fqp = nil
  end
  filename_fqp
end

.generate_hostnames(config) ⇒ Object 



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# File 'lib/stack.rb', line 58

def Stack.generate_hostnames(config)
  stack_hostnames = Array.new
  config[:roles].each do |role, role_details|
    fqdn = role.to_s + '.' + config[:dns_domain]
    stack_hostnames << fqdn
  end
  stack_hostnames
end

.get_running(config) ⇒ Object 



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# File 'lib/stack.rb', line 183

def Stack.get_running(config)
  # create a connection
  connection = Stack.connect(config)

  # generate all the names that this stack will use
  stack_hostnames = Stack.generate_hostnames(config)

  # Amazon EC2, use the tags hash to find hostnames
  running_instances = Hash.new
  connection.servers.each do |instance|
    # pp instance
    if (!instance.tags['Name'].nil? && instance.state != 'terminated' && instance.state != 'shutting-down')
      hostname = instance.tags['Name']
      if stack_hostnames.include?(hostname)
        running_instances[hostname] = instance
      end
    end
  end
  running_instances
end

.load_config(configfile, stack) ⇒ Object 



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# File 'lib/stack.rb', line 15

def Stack.load_config(configfile, stack)
  config_raw = File.read(configfile)
  eval(config_raw)

  config = StackConfig::Stacks[stack]
  config[:stackhome] = File.dirname(File.expand_path(configfile))
  config
end

.populate_config(config) ⇒ Object 



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# File 'lib/stack.rb', line 32

def Stack.populate_config(config)

  config[:find_file_paths] = Array.new if config[:find_file_paths].nil?
  config[:mime_encode_user_data] = true if config[:mime_encode_user_data].nil?
  config[:maintain_dns] = true if config[:maintain_dns].nil?

  # build out the full config for each node, supplying defaults from the
  # global config if explicitly supplied
  config[:node_details] = Hash.new if config[:node_details].nil?

  config[:roles].each do |role, role_details|
    fqdn = role.to_s + '.' + config[:dns_domain]

    config[:node_details][fqdn] = {
      # set the node details from the role, if not specified in the role, use the config global
      # (takes advantage of left to right evaluation of ||)
      :flavor_id          => (role_details[:flavor_id] || config[:flavor_id]),
      :count              => (role_details[:count] || 1),
      :publish_private_ip => (role_details[:publish_private_ip] || false),
      :dns_wildcard       => (role_details[:dns_wildcard] || false),
      :bootstrap          => (role_details[:bootstrap] || 'user-data.sh'),
      :cloud_config_yaml  => (role_details[:cloud_config_yaml] || 'cloud-init.yaml'),
    }
  end
end

.show_details(config) ⇒ Object 



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# File 'lib/stack.rb', line 224

def Stack.show_details(config)
  # create a connection
  connection = Stack.connect(config)

  pp connection.describe_regions
  pp connection.describe_availability_zones

  pp connection.servers

  Stack.populate_config(config)
  pp config[:node_details]
end

.show_dns(config) ⇒ Object 



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# File 'lib/stack.rb', line 166

def Stack.show_dns(config)
  # now register it in DNS
  dns = Fog::DNS.new({ :provider => config[:provider],
                        :aws_access_key_id => config[:aws_access_key_id],
                        :aws_secret_access_key => config[:aws_secret_access_key] })

  zone = dns.zones.get(config[:dns_id])
  if zone.records.empty?
    puts "No DNS records found in #{config[:dns_domain]}"
  else
    printf("%40s %20s %5s %5s\n", 'fqdn', 'value', 'type', 'ttl')
    zone.records.each do |record|
      printf("%40s %20s %5s %5d\n", record.name, record.value, record.type, record.ttl)
    end
  end
end

.show_running(config) ⇒ Object 



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# File 'lib/stack.rb', line 204

def Stack.show_running(config)
  running_instances = Stack.get_running(config)
  running_instances.each do |instance, instance_details|
    # display some details
    puts "#{instance} id=#{instance_details.id} flavor_id=#{instance_details.flavor_id} public_ip=#{instance_details.public_ip_address} private_ip=#{instance_details.private_ip_address}"
  end
end

.update_dns(fqdn, ip_address, config) ⇒ Object 



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# File 'lib/stack.rb', line 147

def Stack.update_dns(fqdn, ip_address, config)
  # now register it in DNS
  dns = Fog::DNS.new({ :provider => config[:provider],
                        :aws_access_key_id => config[:aws_access_key_id],
                        :aws_secret_access_key => config[:aws_secret_access_key] })

  dns.get_hosted_zone(config[:dns_id])
  bmtw = dns.zones.get(config[:dns_id])

  record = bmtw.records.get(fqdn)
  if record
    Logger.info "Updating #{fqdn} with #{ip_address}"
    record.modify(:value => ip_address) if record
  else
    Logger.info "Creating #{fqdn} with #{ip_address}"
    bmtw.records.create(:value => ip_address, :name => fqdn, :type => 'A')
  end
end

.validate(config) ⇒ Object 



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# File 'lib/stack.rb', line 254

def Stack.validate(config)
  # sanity check
  # check credentials, keys, flavor, image, dns etc
  connection = Stack.connect(config)
  pp connection
  pp connection.images.get(config[:image_id])
end

Instance Method Details

#shutdown_all(config) ⇒ Object 



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# File 'lib/stack.rb', line 245

def shutdown_all(config)
  # shutdown all instances
  connection.servers.select do |server|
    puts "Running server:"
    # pp server
  #  server.ready? && server.destroy
  end
end

#upload_keys(config) ⇒ Object 



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# File 'lib/stack.rb', line 237

def upload_keys(config)
  if (key_pair = connection.key_pairs.get(config[:keypair]).nil?)
    key_pair = connection.key_pairs.create( :name => config[:keypair], :public_key => File.read("rentpro-deploy.pub") )
  else
    puts "#{config[:keypair]} key_pair already exists"
  end
end