for AWS&Ruby Beginners

create_instance.rb

#!/usr/bin/env ruby

require 'aws-sdk'

AWS.config(:proxy_uri => ENV['http_proxy'])
config_path = File.expand_path(File.dirname(__FILE__)+"/keys.yml")
AWS.config(YAML.load(File.read(config_path)))

ec2 = AWS::EC2.new
key_name  = security_group_name = 'develEnv'
allow_from = YOUR NETWORK CIDR
vpc_info = {
  :vpc_id => YOUR VPC ID,
  :public_subnet_id  => YOUR PUBLIC SUBNET ID,
  :private_subnet_id => YOUR PRIVATE SUBNET ID,
}

# get ID of latest AmazonLinux AMI
image = AWS.memoize do
  amazon_linux = ec2.images.with_owner("amazon").
    filter("root-device-type", "ebs").
    filter("architecture", "x86_64").
    filter("name", "amzn-ami*")
  amazon_linux.to_a.sort_by(&:name).last
end

# Created if key pair does not exist
if AWS::EC2::KeyPair.new(key_name).exists?
  puts "key pair already exists, \"#{key_name}\""
else
  kp = ec2.key_pairs.create(key_name)
  private_key_file = open("./id_rsa_#{key_name}", 'w+')
  private_key_file.write(kp.private_key)
  private_key_file.close
  puts "created key pair, \"#{key_name}\""
end

private_key_file = open("./id_rsa_#{key_name}", 'r')
p private_key_file.read

# Created if security group does not exist
if ec2.security_groups.filter('group-name', security_group_name).first
  puts "security group already exists, \"#{security_group_name}\""
else
  group = ec2.security_groups.create(security_group_name, {:vpc_id => vpc_info[:vpc_id]})
  group.authorize_ingress(:tcp, 22, allow_from)
  group.authorize_ingress(:tcp, 80, allow_from)
  puts "created security group, \"#{security_group_name}\""
end

instance = ec2.instances.create(
#  :count     => 2,
  :image_id  => image.id,
  :key_name  => key_name,
  :subnet_id => vpc_info[:private_subnet_id],
  :security_groups    => security_group_name,
  :private_ip_address => '10.0.1.5',
  :instance_type      => 't1.micro'
)

instance.tags.Name = "#{security_group_name}_template"

create_instance_simple.rb

#!/usr/bin/env ruby

require 'aws-sdk'

# 環境変数$http_proxyをスクリプト内で有効にする
AWS.config(:proxy_uri => ENV['http_proxy'])

# 同一ディレクトリにあるYAMLを読み込む。
config_path = File.expand_path(File.dirname(__FILE__)+"/keys.yml")
AWS.config(YAML.load(File.read(config_path)))

# 最新のAmazonLinuxのAMI IDを取得
image = AWS.memoize do
  amazon_linux = ec2.images.with_owner("amazon").
    filter("root-device-type", "ebs").
    filter("architecture", "x86_64").
    filter("name", "amzn-ami*")
  amazon_linux.to_a.sort_by(&:name).last
end

# t1.microのインスタンスを作って、’test'という名前を付ける
ec2 = AWS::EC2.new
instance = ec2.instances.create(
  :image_id      => image.id,
  :instance_type => 't1.micro'
)
instance.tags.Name = "test"

keys.yml

access_key_id: YOUR ACCESS KEY
secret_access_key: YOUR SECRET ACCESS KEY

ec2_endpoint : ec2.ap-southeast-1.amazonaws.com