How to set up automatic SSH login to AWS EC2 instance from a Mac terminal

After you have built an AWS EC2 instance,

How to build an AWS EC2 and connect with SSH

you can login into it by SSH via the terminal:

ssh -i /Users/henrywu/MyDrive/98_Products/P01-Project-Alpha/03-keys/AWS_EC2_key_pair_helloworld.pem ec2-user@ec2-44-239-28-119.us-west-2.compute.amazonaws.com

Good news is that you don’t need to remember this long code every time. You can set up automatic SSH login.

Host myec2
    HostName ec2-instance-public-dns-name
    User ec2-instance-username
    IdentityFile /path/to/your-private-key.pem
    AddKeysToAgent yes
    UseKeychain yes
    ForwardAgent no