Is there a way to obtain the instance id within an ec2 instance

Question

I try to launch a service on ec2 instance. the service is supposed to send out the id of the instance. I know this could be obtained using something like `curl http://0.0.0.0/latest/meta-data`. is there any other ways that you could directly get the meta data maybe from the instance shell or some APIs in python?

Accepted Answer

Amazon EC2 instance metadata can be accessed via:

```
http://169.254.169.254/latest/meta-data/
```

To retrieve the ID of the instance from which that request is made:

```
http://169.254.169.254/latest/meta-data/instance-id/
```

This can be retrieved by curl, wget, web browser or anything that makes a call to retrieve an HTTP page.

If you wish to do it programmatically, here's some code from boto3 equivalent to boto.utils.get_instance_metadata()?:

```
# Python2
import urllib2
instanceid = urllib2.urlopen('http://169.254.169.254/latest/meta-data/instance-id').read()

# Python3
import urllib.request
instanceid = urllib.request.urlopen('http://169.254.169.254/latest/meta-data/instance-id').read().decode()
```

There is also a `boto.utils.get_instance_metadata()` call in boto (but not boto3) that returns the instance metadata as a nested Python dictionary.

Is there a way to obtain the instance id within an ec2 instance

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