determine your instance's IPv4 addresses

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### determine your instance's IPv4 addresses
using instance metadata (source : [AWS Docs](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html))
1. Connect to your instance.
2. Use the following command to get its private IP address: `curl http://169.254.169.254/latest/meta-data/local-ipv4`
3. Use the following command to get its public IP address: `curl http://169.254.169.254/latest/meta-data/public-ipv4`