I have accounts on two machines: H1 and H2. I created ssh keys on H1 and installed it on S1. I can now ssh to S1 from H1. I want to do the same from H2. How do I install the ssh keys generated on H1 on H2?
Answer
Edited: If you own both machines, you may share your private key. But this solution is not safe for case of stolen notebook or for machines you don't own.
You may copy your private keys from H1 to H2, if you want to use the same private key to be able to login from H2 to S1. When you at H1 do the commands:
H1$ ssh H2 mkdir ~/.ssh
H1$ scp ~/.ssh/id_rsa ~/.ssh/id_dsa H2:~/.ssh/
Warning! This will delete and replace any private key you had at H2.
Better way is to generate new private keys on H2 (ssh-keygen) and install their public part on S1 with ssh-copy-id util. In this safer case you will have two sets of keys; one is for H1-S1 login and second for H2-S1 login. There will be two public keys authorized at S1. And you will be able to revoke any of them or both (for example, when you notebook is stolen, or owner of the machine decides to disable you account and reuse all your files).
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