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rajucs/set a key pair in existing instances

Created August 16, 2018 10:56
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set a key pair in existing instances
1. Start new t1.micro EC2 instance, using new key pair. Make sure you create it in the same subnet, otherwise you will have to terminate the instance and create it again.
2. SSH to the new micro instance and copy content of ~/.ssh/authorized_keys somewhere on your computer.
3. Login to main instance with old ssh key.
4. Copy & replace the file content from point 2 to ~/.ssh/authorized_keys
5. Now you can login again only with new key. Old key will not work anymore.
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