Several ways to get metadata (like ip address) when you're connected to an EC2:
/opt/aws/bin/ec2-metadata
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                https://links.infomee.fr/?-mOoAQ
  
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                https://links.infomee.fr/?-mOoAQUne vue pratique pour comparer les instances ec2
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                http://www.ec2instances.info/
  
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                http://www.ec2instances.info/