Amazon AWS SDK Uživatelský manuál stáhnout pdf (Strana 18)

require 'rubygems'

require 'aws-sdk'

s3 = AWS::S3.new()

bucket_name = 'text-content'

obj_name = 'text-object.txt'

document = s3.buckets[bucket_name].objects[obj_name]

File.open(obj_name, "w") do |f|

f.write(document.read)

end

puts "'#{obj_name}' copied from S3."

Tip

Try running the modified program on your local system to verify that it does not work without

credentials. If you haven't set your AWS credentials in your environment, you will get an

AWS::Errors::MissingCredentialsError exception.

Transfer the modified source to your EC2 instance

Transfer the modified source file to your EC2 instance using scp. Be sure to specify the .pem file you

created earlier, and use the public DNS name of the instance to connect with.The command will look

something like this:

scp -i ruby-iam-ec2-ssh.pem get_object.rb \

Note

If you launched an EC2 machine image other than the Amazon Linux AMI recommended earlier,

you may need to use "root" instead of "ec2-user" when connecting to the instance using ssh or

scp. Additionally, the steps for configuring and running the program in the next section may

differ somewhat.

Run the program within the EC2 instance

To run the program

1. Connect to your EC2 instance with ssh. Use the same public DNS name and .pem file you used to

copy the source code in the preceding section—for example:

ssh -i ruby-iam-ec2-ssh.pem [email protected]

2. The Amazon Linux AMI has Ruby 1.8.7 installed by default. However, we recommend using Ruby

1.9 with the AWS SDK for Ruby.To install Ruby 1.9 on the Amazon Linux AMI, use the following

command:

sudo yum install ruby19 rubygems19

3. Set your AMI to use Ruby 1.9 by default by executing the following command:

Version v1.0.0

AWS SDK for Ruby Developer Guide

Updating the Sample Program to Use IAM Roles

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Amazon AWS SDK Uživatelský manuál Strana 18