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How can I find out the instance id of an ec2 instance from within the ec2 instance?

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AWS sees to it that the Instance ID is available as a part of the EC2 meta data.

you can use the following command to retrieve the Instance ID.

EC2_instance_id=`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id`

You can also use the above mentioned command inside of a script to retrieve the instance ID.

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