Replace or change a key on ec2 instance

README.MD

AWS doesnt let you change your ec2 instance key from the admin console.

If you need to replace a key for an ec2 instance:

0. if you already have the key/pub generated, jump to #3.

1. Create a new key from command line:

ssh-keygen -t rsa -C "my-new-key"

Chose a name and add .pem as extention.

This will create two files, a .pub and a .pem

2. Log into you instance as the user you want to change key, or simly root

3. Edit the ~/.ssh/authorized_keys copy the content of the pub file and save it.

Will be somethign like this: ssh-rsa 2e+Mk2Y3mfswFpno9....long bla bla...3442f2A pepe

4. Now try to login, the id file is your new pem file as usual

ssh -i "pepe.pub.pem" root@ec2-7-10-54-11.compute-1.amazonaws.com

5. Delete other old keys from authorized_keys if you want.