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Add the use of EC2_METADATA_DUMMY_YAML env variable to README #1

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Add the use of EC2_METADATA_DUMMY_YAML env variable to README #1

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10 changes: 7 additions & 3 deletions README.rdoc
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== Dummy YAML
If you want to access meta-data or user-data not on EC2 Instance like on it,
make one of these files
Use a Dummy YAML file to mimic meta-data or user-data similiar to an EC2 Instance

You can make one of these files:
./config/ec2_metadata.yml
./ec2_metadata.yml
~/ec2_metadata.yml
/etc/ec2_metadata.yml

Dummy YAML file must be like output of ec2-metadata on EC2 instance.
You can also specify the path to a file by defining the `EC2_METADATA_DUMMY_YAML` environment variable
$ export EC2_METADATA_DUMMY_YAML=/path/to/dummy/yaml/file.yml

The content of the Dummy YAML file must be like the output of ec2-metadata on an EC2 instance.
You can export it on EC2 instance like this:
$ ec2-medatata > ec2_metadata.yml
$ cp ec2_metadata.yml /path/to/dir/for/non/ec2/instance
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