Class: Commands::AddInstance

Inherits:
Object
  • Object
show all
Defined in:
lib/commands/add_instance.rb

Instance Method Summary collapse

Instance Method Details

#options ⇒ Object

holds the options that were passed you can set any initial defaults here



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# File 'lib/commands/add_instance.rb', line 6

def options
  @options ||= {
      :instance_size => "c1.medium",
      :start_app => false,
      :availability_zone => "us-east-1c"   # this is where our reserved instance currently are
  }
end

#register(opts, global_options) ⇒ Object 



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# File 'lib/commands/add_instance.rb', line 22

def register(opts, global_options)
  opts.banner = "Usage: add [options]"
  opts.description = "Add a server instance"

  opts.on('-s', "--size instance_size", ["t1.micro", "m1.small", "c1.medium"], "The amazon instance size - currently we limit to 32 bit instances.") do |v|
    options[:instance_size] = v
  end

  opts.on('-z', "--zone availability_zone", MetaOptions.availability_zones, "The amazon availability zone - currently we only support the east coast.") do |v|
    options[:availability_zone] = v
  end

  opts.on('-r', "--role role", MetaOptions.roles, "Required - Role server will play.") do |v|
    options[:role] = v
  end

  opts.on("--start_app", "Set if you want to deploy and start the app after instance is ready.") do |v|
    options[:start_app] = v
  end

  opts.on('-e', "--extra extra", MetaOptions.roles, "Optional extra data associated with this instance.") do |v|
    options[:extra] = v
  end

  opts.on('-g', "--group deploy_group", "Required - The deploy group we are in.  A deploy group is a set of servers that are required to run the infrastructure for a server.") do |v|
    options[:group] = v
  end

  opts.on('-p', "--print path", "The directory into which we output the data as a file per host.") do |v|
    options[:result_path] = v
  end
end

#required_options ⇒ Object

required options



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# File 'lib/commands/add_instance.rb', line 15

def required_options
  @required_options ||= Set.new [
      :role,
      :group,
  ]
end

#run(global_options, amazon) ⇒ Object 



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# File 'lib/commands/add_instance.rb', line 56

def run(global_options, amazon)
  ec2 = amazon.ec2
  utils = ZZSharedLib::Utils.new(amazon)

  user_json = JSON.pretty_generate(options)

  # deploy group
  group_name = options[:group]
  role = options[:role]
  extra = options[:extra]
  start_app = options[:start_app]

  # first see if already exists
  deploy_group = amazon.find_deploy_group(group_name)
  recipes_deploy_tag = deploy_group.recipes_deploy_tag
  group_config = deploy_group.config

  availability_zone = options[:availability_zone] || group_config[:availability_zone]

  # the security key
  security_key = group_config[:amazon_security_key]

  # the security group
  security_group = group_config[:amazon_security_group]

  # find ones matching the role
  match = amazon.find_by_role(group_name, role)

  # stop if we have a case where we only allow one of a particular kind
  case role.to_sym
    when :app_master, :db, :solo
      if match.length > 0
        raise "Argument error: You already have a duplicate role of #{role}.  The existing instance is #{match[0]}."
      end
  end

  # now find the proper AMI image to use
  baseline_image = group_config[:amazon_image]

  # first see if we have a specific image for this role
  role_image = "#{baseline_image}_#{role}"
  match_image = amazon.find_typed_resource("image", "Name", role_image)
  if match_image.length > 1
    raise "You must have only one AMI Image for #{role_image}.  Found: #{match_image.length}"
  end

  if match_image.length != 1
    # didn't have a specific role image so get the generic one
    match_image = amazon.find_typed_resource("image", "Name", baseline_image)
    if match_image.length != 1
      raise "Need to have exactly one AMI Image for #{baseline_image}.  Found: #{match_image.length}"
    end
  end


  instances = ec2.run_instances(match_image[0], 1, 1, [security_group], security_key, user_json, nil, options[:instance_size],
                                nil, nil, availability_zone)
  inst_id = instances[0][:aws_instance_id]
  puts "Waiting for instance #{inst_id} to boot"
  aws_state = ""
  instance = nil
  waits = 0
  while aws_state != "running" do
    print "."
    STDOUT.flush
    sleep(1)
    waits += 1
    # this silly bit of logic is needed because sometimes Amazons API does not know
    # about the newly created instance for a brief period so don't ask till we give it
    # a chance to learn about it
    if waits >= 10
      instance = ec2.describe_instances(inst_id)[0]
      aws_state = instance[:aws_state]
    end
  end
  puts
  puts "Tagging instance."
  ec2.create_tags(inst_id, {"Name" => "#{group_name}_#{role}_#{inst_id}", :group => group_name, :role => role, :extra => extra,
                            :state => 'booting', :deploy_app => ZZSharedLib::Utils::NEVER, :deploy_chef => ZZSharedLib::Utils::NEVER })

  dns_name = instance[:dns_name]
  ssh_cmd = "ssh -t -i ~/.ssh/#{group_config[:amazon_security_key]}.pem ec2-user@#{dns_name}"
  puts ssh_cmd
  test_cmd = 'echo "connected"'
  test_cmd = "#{ssh_cmd} '#{test_cmd}'"
  tries = 0
  while true do
    puts "testing ssh connection"
    result = ZZSharedLib::CL.do_cmd_result test_cmd
    break if result == 0
    sleep(6)
    tries += 1
    if tries >= 10
      # todo decide if we should terminate this instance
      ec2.create_tags(inst_id, {:state => 'failed_boot' })
      raise "Not able to establish ssh connection, make sure the security group has the ssh port open."
    end
  end

  # if we get here we should have verified that the machine is ready and we can ssh into it, lets
  # do the initial upload step for the chef recipes by fetching the proper tag on the remote machine
  ec2.create_tags(inst_id, {:state => 'ready' })

  git_cmd = ChefUpload.get_upload_command(recipes_deploy_tag)
  remote_cmd = "#{ssh_cmd} \"#{git_cmd}\""
  result = ZZSharedLib::CL.do_cmd_result remote_cmd
  if result != 0
    raise "The instance was created but we were unable to upload the chef recipes.\nYou should try again by using 'chef_upload' and make sure you have a valid git tag."
  end

  # set up our instance id
  # first get all instances in our group which should include us
  amazon.flush_tags    # force a refresh of the cached tags
  all_instances = amazon.find_and_sort_named_instances(group_name)

  just_our_instance = all_instances.reject { |inst| inst[:resource_id] != inst_id }

  # deploy the chef config
  puts "Updating chef configuration for new instance."
  BuildDeployConfig.do_config_deploy(utils, amazon, just_our_instance, group_name, deploy_group, options[:result_path])

  # optionally deploy and start app
  # note in this case we redeploy the whole group since
  # there are dependencies between the instances
  if start_app
    puts "Now deploying all app instances since the configuration changed."
    BuildDeployConfig.do_app_deploy(utils, amazon, all_instances, group_name, deploy_group, '', false, false, options[:result_path])
  end

end