How to generate an EC2 key pair

$ ssh-keygen -m PEM

Make sure the id_rsa files are created in the current directory.

Don't give a passphrase.

This process will generate id_rsa and id_rsa.pub in the current directory.

Run this command to make the id_rsa file read-only:

chmod u-w+r,g-rwx,o-rwx id_rsa

Then, terraform file ec2_key_pair.tf is used to import the file into AWS.

The project requires 2 pairs.

1. id_rsa for connection from local laptop/machine to ec2-2 machine in the public subnet.
2. id_rsa_internal for connection from ec-2 machine to ec2-1 machine in the private subnet.