在 Amazon EC2 中使用弹性 IP 地址 - 适用于 Ruby 的 Amazon 开发工具包
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在 Amazon EC2 中使用弹性 IP 地址

下面的代码示例:

  1. 显示有关与 Amazon Elastic Compute Cloud (Amazon EC2) 实例相关的任何地址的信息。

  2. 在 Amazon Virtual Private Cloud (Amazon VPC) 中创建弹性 IP 地址。

  3. 将地址与实例关联起来。

  4. 再次显示有关与实例关联的地址的信息。这一次,应显示新的地址关联。

  5. 释放地址。

  6. 再次显示有关与实例关联的地址的信息。这一次,不应显示已发布的地址。

# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX - License - Identifier: Apache - 2.0 # This code example does the following: # 1. Displays information about any addresses associated with an # Amazon Elastic Compute Cloud (Amazon EC2) instance. # 2. Creates an Elastic IP address in Amazon Virtual Private Cloud (Amazon VPC). # 3. Associates the address with the instance. # 4. Displays information again about addresses associated with the instance. # This time, the new address association should display. # 5. Releases the address. # 6. Displays information again about addresses associated with the instance. # This time, the released address should not display. require 'aws-sdk-ec2' # Checks whether the specified Amazon Elastic Compute Cloud # (Amazon EC2) instance exists. # # Prerequisites: # # - The Amazon EC2 instance. # # @param ec2_client [Aws::EC2::Client] An initialized EC2 client. # @param instance_id [String] The ID of the instance. # @return [Boolean] true if the instance exists; otherwise, false. # @example # exit 1 unless instance_exists?( # Aws::EC2::Client.new(region: 'us-east-1'), # 'i-033c48ef067af3dEX' # ) def instance_exists?(ec2_client, instance_id) ec2_client.describe_instances(instance_ids: [instance_id]) return true rescue StandardError return false end # Creates an Elastic IP address in Amazon Virtual Private Cloud (Amazon VPC). # # @param ec2_client [Aws::EC2::Client] An initialized EC2 client. # @return [String] The allocation ID corresponding to the Elastic IP address. # @example # puts allocate_elastic_ip_address(Aws::EC2::Client.new(region: 'us-east-1')) def allocate_elastic_ip_address(ec2_client) response = ec2_client.allocate_address(domain: 'vpc') return response.allocation_id rescue StandardError => e puts "Error allocating Elastic IP address: #{e.message}" return 'Error' end # Associates an Elastic IP address with an Amazon Elastic Compute Cloud # (Amazon EC2) instance. # # Prerequisites: # # - The allocation ID corresponding to the Elastic IP address. # - The Amazon EC2 instance. # # @param ec2_client [Aws::EC2::Client] An initialized EC2 client. # @param allocation_id [String] The ID of the allocation corresponding to # the Elastic IP address. # @param instance_id [String] The ID of the instance. # @return [String] The assocation ID corresponding to the association of the # Elastic IP address to the instance. # @example # puts allocate_elastic_ip_address( # Aws::EC2::Client.new(region: 'us-east-1'), # 'eipalloc-04452e528a66279EX', # 'i-033c48ef067af3dEX') def associate_elastic_ip_address_with_instance( ec2_client, allocation_id, instance_id ) response = ec2_client.associate_address( allocation_id: allocation_id, instance_id: instance_id, ) return response.association_id rescue StandardError => e puts "Error associating Elastic IP address with instance: #{e.message}" return 'Error' end # Gets information about addresses associated with an # Amazon Elastic Compute Cloud (Amazon EC2) instance. # # Prerequisites: # # - The Amazon EC2 instance. # # @param ec2_client [Aws::EC2::Client] An initialized EC2 client. # @param instance_id [String] The ID of the instance. # @example # describe_addresses_for_instance( # Aws::EC2::Client.new(region: 'us-east-1'), # 'i-033c48ef067af3dEX' # ) def describe_addresses_for_instance(ec2_client, instance_id) response = ec2_client.describe_addresses( filters: [ { name: 'instance-id', values: [instance_id] } ] ) addresses = response.addresses if addresses.count.zero? puts 'No addresses.' else addresses.each do |address| puts '-' * 20 puts "Public IP: #{address.public_ip}" puts "Private IP: #{address.private_ip_address}" end end rescue StandardError => e puts "Error getting address information for instance: #{e.message}" end # Releases an Elastic IP address from an # Amazon Elastic Compute Cloud (Amazon EC2) instance. # # Prerequisites: # # - An Amazon EC2 instance with an associated Elastic IP address. # # @param ec2_client [Aws::EC2::Client] An initialized EC2 client. # @param allocation_id [String] The ID of the allocation corresponding to # the Elastic IP address. # @return [Boolean] true if the Elastic IP address was released; # otherwise, false. # @example # exit 1 unless elastic_ip_address_released?( # Aws::EC2::Client.new(region: 'us-east-1'), # 'eipalloc-04452e528a66279EX' # ) def elastic_ip_address_released?(ec2_client, allocation_id) ec2_client.release_address(allocation_id: allocation_id) return true rescue StandardError => e return "Error releasing Elastic IP address: #{e.message}" return false end # Full example call: def run_me instance_id = '' region = '' # Print usage information and then stop. if ARGV[0] == '--help' || ARGV[0] == '-h' puts 'Usage: ruby ec2-ruby-example-elastic-ips.rb ' \ 'INSTANCE_ID REGION' puts 'Example: ruby ec2-ruby-example-elastic-ips.rb ' \ 'i-033c48ef067af3dEX us-east-1' exit 1 # If no values are specified at the command prompt, use these default values. elsif ARGV.count.zero? instance_id = 'i-033c48ef067af3dEX' region = 'us-east-1' # Otherwise, use the values as specified at the command prompt. else instance_id = ARGV[0] region = ARGV[1] end ec2_client = Aws::EC2::Client.new(region: region) unless instance_exists?(ec2_client, instance_id) puts "Cannot find instance with ID '#{instance_id}'. Stopping program." exit 1 end puts "Addresses for instance with ID '#{instance_id}' before allocating " \ 'Elastic IP address:' describe_addresses_for_instance(ec2_client, instance_id) puts 'Allocating Elastic IP address...' allocation_id = allocate_elastic_ip_address(ec2_client) if allocation_id.start_with?('Error') puts 'Stopping program.' exit 1 else puts "Elastic IP address created with allocation ID '#{allocation_id}'." end puts 'Associating Elastic IP address with instance...' association_id = associate_elastic_ip_address_with_instance( ec2_client, allocation_id, instance_id ) if association_id.start_with?('Error') puts 'Stopping program. You must associate the Elastic IP address yourself.' exit 1 else puts 'Elastic IP address associated with instance with association ID ' \ "'#{association_id}'." end puts 'Addresses for instance after allocating Elastic IP address:' describe_addresses_for_instance(ec2_client, instance_id) puts 'Releasing the Elastic IP address from the instance...' if elastic_ip_address_released?(ec2_client, allocation_id) == false puts 'Stopping program. You must release the Elastic IP address yourself.' exit 1 else puts 'Address released.' end puts 'Addresses for instance after releasing Elastic IP address:' describe_addresses_for_instance(ec2_client, instance_id) end run_me if $PROGRAM_NAME == __FILE__