Capistranoデプロイタスク

deploy.rb

require 'aws-sdk'

lock '3.4.0'

set :application, 'example_app'

set :pty, true
set :user, "ubuntu"
set :use_sudo, true
set :ssh_key, "~/.ssh/example_app.pem"

set :role_name, 'example_app'
set :env_name, 'staging'

REGION = 'ap-northeast-1'

Aws.config.update({
  region: REGION
})

namespace :deploy do
  task :main do
    invoke "deploy:set_target_instances"
    invoke "deploy:upgrade_to_latest"
  end

  task :set_target_instances do
    count = 0
    ec2 = Aws::EC2::Client.new
    ec2.describe_instances(
      filters:[
        { name: "tag:Environment", values: [fetch(:env_name)] },
        { name: "tag:Role", values: [fetch(:role_name)] },
        { name: 'instance-state-name', values: ['running'] }
      ]
    ).reservations.each {|r|
      r.instances.each {|i|
        puts "#{fetch(:role_name)}(#{count += 1}): #{i.public_dns_name}"
        server i.public_dns_name, roles: %w(app), user: fetch(:user), ssh_options: {
          keys: [File.expand_path(fetch(:ssh_key))]
        }
      }
    }
  end

  task :upgrade_to_latest do
    on roles(:app) do |host|
      upload! "upgrade.sh", "/tmp/upgrade.sh"
      execute "chmod +x /tmp/upgrade.sh && /tmp/upgrade.sh"
    end
  end
end