You can use AWS EC2 metadata service to get the EC2 instance id from within an ec2 instance.
The link to EC2 metadata service is http://169.254.169.254/latest/meta-data/
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## for IMDSv1 (default) curl http://169.254.169.254/latest/meta-data/instance-id ## for IMDSv2 TOKEN=`curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"` \ && curl -H "X-aws-ec2-metadata-token: $TOKEN" -v http://169.254.169.254/latest/meta-data/instance-id |